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Date: Thu, 5 Oct 2023 20:32:23 +0200
From: Benedikt Spranger <b.spranger@...utronix.de>
To: Maxime Ripard <mripard@...nel.org>
Cc: linux-kernel@...r.kernel.org, linux-clk@...r.kernel.org,
Stephen Boyd <sboyd@...nel.org>,
Michael Turquette <mturquette@...libre.com>,
Dinh Nguyen <dinguyen@...nel.org>
Subject: Re: [PATCH 1/1] clk: socfpga: gate: Fix of by factor 2 for serial
console
On Thu, 5 Oct 2023 13:34:01 +0200
Maxime Ripard <mripard@...nel.org> wrote:
> Hi,
>
> On Thu, Oct 05, 2023 at 11:59:27AM +0200, Benedikt Spranger wrote:
> > Commit 9607beb917df ("clk: socfpga: gate: Add a determine_rate
> > hook") introduce a specific determine_rate hook. As a result the
> > calculated clock for the serial IP is off by factor 2 after that
> > i.e. if the system configures a baudrate of 115200 it is set
> > physicaly to 57600.
>
> Where is that factor 2 coming from?
In drivers/tty/serial/8250/8250_dw.c p->uartclk is set twice as high,
as it should be:
dw8250_set_termios() is called and rate is evaluated to 20000000 in the
bad and 10000000 in the good case. As a result p->uartclk is set to
20000000 in the bad case.
> > Change the determine_rate hook to the reparent variant
> > __clk_mux_determine_rate() to fix the issue.
>
> It's also not clear to me why that would fix anything. This patch
> should only make the old behaviour explicit, could you expand a bit
> on what happens?
Booting the kernel with console=ttyS0,115200 result in a corrupted
character output. Setting the serial terminal application to 57600
make the serial console working.
I dug deeper and added some debug output (see patch below):
trace output (good - determine_rate = __clk_mux_determine_rate):
# tracer: nop
#
# entries-in-buffer/entries-written: 237/237 #P:2
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 462500000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 231250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 115625000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 6250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 3125000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 6250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 6250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 97368421
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 97368421
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = l4_mp_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: l4_mp_clk = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = l4_sp_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: l4_sp_clk = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 1953125
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 250000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 5
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 40000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 5
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 40000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 6250
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 32000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 50000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = sdmmc_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: sdmmc_clk = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: fixed_div: div = 4
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 50000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = nand_x_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: nand_clk / nand_x_clk = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: fixed_div: div = 4
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 50000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = qspi_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: qspi_clk = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 3613281
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 400000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 800000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 400000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 133333333
<idle>-0 [000] d.... 0.000000: clk_prepare: osc1
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: osc1
<idle>-0 [000] d.... 0.000000: clk_prepare: main_pll
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: main_pll
<idle>-0 [000] d.... 0.000000: clk_prepare: mpuclk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: mpuclk
<idle>-0 [000] d.... 0.000000: clk_prepare: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_enable: osc1
<idle>-0 [000] d.... 0.000000: clk_enable_complete: osc1
<idle>-0 [000] d.... 0.000000: clk_enable: main_pll
<idle>-0 [000] d.... 0.000000: clk_enable_complete: main_pll
<idle>-0 [000] d.... 0.000000: clk_enable: mpuclk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: mpuclk
<idle>-0 [000] d.... 0.000000: clk_enable: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_prepare: periph_pll
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: periph_pll
<idle>-0 [000] d.... 0.000000: clk_prepare: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_prepare: l4_sp_clk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: l4_sp_clk
<idle>-0 [000] d.... 0.000000: clk_enable: periph_pll
<idle>-0 [000] d.... 0.000000: clk_enable_complete: periph_pll
<idle>-0 [000] d.... 0.000000: clk_enable: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_enable: l4_sp_clk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: l4_sp_clk
init-1 [000] .n... 0.033332: clk_prepare: mainclk
init-1 [000] .n... 0.033338: clk_prepare_complete: mainclk
init-1 [000] .n... 0.033339: clk_prepare: l4_main_clk
init-1 [000] .n... 0.033341: clk_prepare_complete: l4_main_clk
init-1 [000] dn... 0.033344: clk_enable: mainclk
init-1 [000] dn... 0.033345: clk_enable_complete: mainclk
init-1 [000] dn... 0.033346: clk_enable: l4_main_clk
init-1 [000] dn... 0.033349: clk_enable_complete: l4_main_clk
init-1 [000] d.... 0.033420: clk_disable: l4_main_clk
init-1 [000] d.... 0.033424: clk_disable_complete: l4_main_clk
init-1 [000] d.... 0.033425: clk_disable: mainclk
init-1 [000] d.... 0.033426: clk_disable_complete: mainclk
init-1 [000] ..... 0.033430: clk_unprepare: l4_main_clk
init-1 [000] ..... 0.033431: clk_unprepare_complete: l4_main_clk
init-1 [000] ..... 0.033432: clk_unprepare: mainclk
init-1 [000] ..... 0.033434: clk_unprepare_complete: mainclk
init-1 [001] ..... 0.116063: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.116089: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.116096: dw8250_set_termios: dw8250_set_termios: rate = 4294967274 newrate = 1843200
init-1 [001] ..... 0.116098: dw8250_set_termios: dw8250_set_termios: before: uartclk = 100000000
init-1 [001] ..... 0.116100: dw8250_set_termios: dw8250_set_termios: after: uartclk = 100000000
init-1 [001] ..... 0.920389: clk_prepare: emac1_clk
init-1 [001] ..... 0.920395: clk_prepare_complete: emac1_clk
init-1 [001] ..... 0.920396: clk_prepare: emac_1_clk
init-1 [001] ..... 0.920398: clk_prepare_complete: emac_1_clk
init-1 [001] d.... 0.920401: clk_enable: emac1_clk
init-1 [001] d.... 0.920403: clk_enable_complete: emac1_clk
init-1 [001] d.... 0.920404: clk_enable: emac_1_clk
init-1 [001] d.... 0.920407: clk_enable_complete: emac_1_clk
kworker/1:1-36 [001] d.... 1.041458: clk_disable: emac_1_clk
kworker/1:1-36 [001] d.... 1.041465: clk_disable_complete: emac_1_clk
kworker/1:1-36 [001] d.... 1.041466: clk_disable: emac1_clk
kworker/1:1-36 [001] d.... 1.041468: clk_disable_complete: emac1_clk
kworker/1:1-36 [001] ..... 1.041471: clk_unprepare: emac_1_clk
kworker/1:1-36 [001] ..... 1.041473: clk_unprepare_complete: emac_1_clk
kworker/1:1-36 [001] ..... 1.041474: clk_unprepare: emac1_clk
kworker/1:1-36 [001] ..... 1.041475: clk_unprepare_complete: emac1_clk
init-1 [001] ..... 1.041519: clk_prepare: usb_mp_clk
init-1 [001] ..... 1.041521: clk_prepare_complete: usb_mp_clk
init-1 [001] d.... 1.041524: clk_enable: usb_mp_clk
init-1 [001] d.... 1.041526: clk_enable_complete: usb_mp_clk
kworker/u6:1-33 [001] ..... 1.093644: clk_prepare: l4_mp_clk
kworker/u6:1-33 [001] ..... 1.093649: clk_prepare_complete: l4_mp_clk
kworker/u6:1-33 [001] d.... 1.093652: clk_enable: l4_mp_clk
kworker/u6:1-33 [001] d.... 1.093654: clk_enable_complete: l4_mp_clk
kworker/u6:1-33 [001] ..... 1.093663: clk_prepare: per_nand_mmc_clk
kworker/u6:1-33 [001] ..... 1.093665: clk_prepare_complete: per_nand_mmc_clk
kworker/u6:1-33 [001] ..... 1.093666: clk_prepare: sdmmc_clk
kworker/u6:1-33 [001] ..... 1.093667: clk_prepare_complete: sdmmc_clk
kworker/u6:1-33 [001] ..... 1.093669: clk_prepare: sdmmc_clk_divided
kworker/u6:1-33 [001] ..... 1.093670: clk_prepare_complete: sdmmc_clk_divided
kworker/u6:1-33 [001] d.... 1.093672: clk_enable: per_nand_mmc_clk
kworker/u6:1-33 [001] d.... 1.093673: clk_enable_complete: per_nand_mmc_clk
kworker/u6:1-33 [001] d.... 1.093674: clk_enable: sdmmc_clk
kworker/u6:1-33 [001] d.... 1.093676: clk_enable_complete: sdmmc_clk
kworker/u6:1-33 [001] d.... 1.093678: clk_enable: sdmmc_clk_divided
kworker/u6:1-33 [001] d.... 1.093679: clk_enable_complete: sdmmc_clk_divided
kworker/u6:1-33 [001] ..... 1.235194: clk_prepare: mainclk
kworker/u6:1-33 [001] ..... 1.235200: clk_prepare_complete: mainclk
kworker/u6:1-33 [001] ..... 1.235202: clk_prepare: l4_main_clk
kworker/u6:1-33 [001] ..... 1.235203: clk_prepare_complete: l4_main_clk
kworker/u6:1-33 [001] d.... 1.235206: clk_enable: mainclk
kworker/u6:1-33 [001] d.... 1.235207: clk_enable_complete: mainclk
kworker/u6:1-33 [001] d.... 1.235209: clk_enable: l4_main_clk
kworker/u6:1-33 [001] d.... 1.235212: clk_enable_complete: l4_main_clk
init-1 [001] .n... 1.279697: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] .n... 1.279706: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] .n... 1.279712: dw8250_set_termios: dw8250_set_termios: rate = 4294967274 newrate = 1843200
init-1 [001] .n... 1.279715: dw8250_set_termios: dw8250_set_termios: before: uartclk = 100000000
init-1 [001] .n... 1.279717: dw8250_set_termios: dw8250_set_termios: after: uartclk = 100000000
kworker/1:1-36 [001] d.... 1.285954: clk_disable: l4_main_clk
kworker/1:1-36 [001] d.... 1.285960: clk_disable_complete: l4_main_clk
kworker/1:1-36 [001] d.... 1.285962: clk_disable: mainclk
kworker/1:1-36 [001] d.... 1.285963: clk_disable_complete: mainclk
(udev-worker)-83 [000] ..... 1.849061: clk_prepare: emac1_clk
(udev-worker)-83 [000] ..... 1.849068: clk_prepare_complete: emac1_clk
(udev-worker)-83 [000] ..... 1.849070: clk_prepare: emac_1_clk
(udev-worker)-83 [000] ..... 1.849071: clk_prepare_complete: emac_1_clk
(udev-worker)-83 [000] d.... 1.849075: clk_enable: emac1_clk
(udev-worker)-83 [000] d.... 1.849077: clk_enable_complete: emac1_clk
(udev-worker)-83 [000] d.... 1.849078: clk_enable: emac_1_clk
(udev-worker)-83 [000] d.... 1.849082: clk_enable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 1.850179: clk_disable: emac_1_clk
kworker/0:1-10 [000] d.... 1.850187: clk_disable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 1.850193: clk_disable: emac1_clk
kworker/0:1-10 [000] d.... 1.850194: clk_disable_complete: emac1_clk
kworker/0:1-10 [000] ..... 1.850198: clk_unprepare: emac_1_clk
kworker/0:1-10 [000] ..... 1.850200: clk_unprepare_complete: emac_1_clk
kworker/0:1-10 [000] ..... 1.850202: clk_unprepare: emac1_clk
kworker/0:1-10 [000] ..... 1.850203: clk_unprepare_complete: emac1_clk
init-1 [000] ..... 2.730939: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 2.730947: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 2.730953: dw8250_set_termios: dw8250_set_termios: rate = 4294967274 newrate = 1843200
init-1 [000] ..... 2.730956: dw8250_set_termios: dw8250_set_termios: before: uartclk = 100000000
init-1 [000] ..... 2.730958: dw8250_set_termios: dw8250_set_termios: after: uartclk = 100000000
(udev-worker)-229 [000] ..... 4.222397: clk_prepare: emac1_clk
(udev-worker)-229 [000] ..... 4.222404: clk_prepare_complete: emac1_clk
(udev-worker)-229 [000] ..... 4.222405: clk_prepare: emac_1_clk
(udev-worker)-229 [000] ..... 4.222407: clk_prepare_complete: emac_1_clk
(udev-worker)-229 [000] d.... 4.222410: clk_enable: emac1_clk
(udev-worker)-229 [000] d.... 4.222412: clk_enable_complete: emac1_clk
(udev-worker)-229 [000] d.... 4.222413: clk_enable: emac_1_clk
(udev-worker)-229 [000] d.... 4.222416: clk_enable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 4.222472: clk_disable: emac_1_clk
kworker/0:1-10 [000] d.... 4.222476: clk_disable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 4.222477: clk_disable: emac1_clk
kworker/0:1-10 [000] d.... 4.222479: clk_disable_complete: emac1_clk
kworker/0:1-10 [000] ..... 4.222482: clk_unprepare: emac_1_clk
kworker/0:1-10 [000] ..... 4.222484: clk_unprepare_complete: emac_1_clk
kworker/0:1-10 [000] ..... 4.222485: clk_unprepare: emac1_clk
kworker/0:1-10 [000] ..... 4.222486: clk_unprepare_complete: emac1_clk
(udev-worker)-229 [000] ..... 4.225917: clk_prepare: emac1_clk
(udev-worker)-229 [000] ..... 4.225924: clk_prepare_complete: emac1_clk
(udev-worker)-229 [000] ..... 4.225925: clk_prepare: emac_1_clk
(udev-worker)-229 [000] ..... 4.225927: clk_prepare_complete: emac_1_clk
(udev-worker)-229 [000] d.... 4.225931: clk_enable: emac1_clk
(udev-worker)-229 [000] d.... 4.225932: clk_enable_complete: emac1_clk
(udev-worker)-229 [000] d.... 4.225933: clk_enable: emac_1_clk
(udev-worker)-229 [000] d.... 4.225937: clk_enable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 4.225993: clk_disable: emac_1_clk
kworker/0:1-10 [000] d.... 4.225997: clk_disable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 4.225998: clk_disable: emac1_clk
kworker/0:1-10 [000] d.... 4.226000: clk_disable_complete: emac1_clk
kworker/0:1-10 [000] ..... 4.226003: clk_unprepare: emac_1_clk
kworker/0:1-10 [000] ..... 4.226005: clk_unprepare_complete: emac_1_clk
kworker/0:1-10 [000] ..... 4.226006: clk_unprepare: emac1_clk
kworker/0:1-10 [000] ..... 4.226008: clk_unprepare_complete: emac1_clk
(udev-worker)-229 [000] ..... 4.227357: clk_prepare: emac1_clk
(udev-worker)-229 [000] ..... 4.227362: clk_prepare_complete: emac1_clk
(udev-worker)-229 [000] ..... 4.227363: clk_prepare: emac_1_clk
(udev-worker)-229 [000] ..... 4.227365: clk_prepare_complete: emac_1_clk
(udev-worker)-229 [000] d.... 4.227368: clk_enable: emac1_clk
(udev-worker)-229 [000] d.... 4.227370: clk_enable_complete: emac1_clk
(udev-worker)-229 [000] d.... 4.227371: clk_enable: emac_1_clk
(udev-worker)-229 [000] d.... 4.227374: clk_enable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 4.227507: clk_disable: emac_1_clk
kworker/0:1-10 [000] d.... 4.227513: clk_disable_complete: emac_1_clk
kworker/0:1-10 [000] d.... 4.227514: clk_disable: emac1_clk
kworker/0:1-10 [000] d.... 4.227516: clk_disable_complete: emac1_clk
kworker/0:1-10 [000] ..... 4.227519: clk_unprepare: emac_1_clk
kworker/0:1-10 [000] ..... 4.227521: clk_unprepare_complete: emac_1_clk
kworker/0:1-10 [000] ..... 4.227522: clk_unprepare: emac1_clk
kworker/0:1-10 [000] ..... 4.227523: clk_unprepare_complete: emac1_clk
ip-777 [001] ..... 8.834235: clk_prepare: emac1_clk
ip-777 [001] ..... 8.834241: clk_prepare_complete: emac1_clk
ip-777 [001] ..... 8.834242: clk_prepare: emac_1_clk
ip-777 [001] ..... 8.834243: clk_prepare_complete: emac_1_clk
ip-777 [001] d.... 8.834246: clk_enable: emac1_clk
ip-777 [001] d.... 8.834248: clk_enable_complete: emac1_clk
ip-777 [001] d.... 8.834249: clk_enable: emac_1_clk
ip-777 [001] d.... 8.834252: clk_enable_complete: emac_1_clk
getty-1284 [001] ..... 19.510813: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1284 [001] ..... 19.510822: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1284 [001] ..... 19.510828: dw8250_set_termios: dw8250_set_termios: rate = 4294967274 newrate = 1843200
getty-1284 [001] ..... 19.510830: dw8250_set_termios: dw8250_set_termios: before: uartclk = 100000000
getty-1284 [001] ..... 19.510832: dw8250_set_termios: dw8250_set_termios: after: uartclk = 100000000
trace output (bad - determine_rate = clk_hw_determine_rate_no_reparent):
# tracer: nop
#
# entries-in-buffer/entries-written: 285/285 #P:2
#
# _-----=> irqs-off/BH-disabled
# / _----=> need-resched
# | / _---=> hardirq/softirq
# || / _--=> preempt-depth
# ||| / _-=> migrate-disable
# |||| / delay
# TASK-PID CPU# ||||| TIMESTAMP FUNCTION
# | | | ||||| | |
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 462500000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 231250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 115625000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 6250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 3125000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 6250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 6250000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 97368421
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 97368421
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = l4_mp_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: l4_mp_clk = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = l4_sp_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: l4_sp_clk = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 1953125
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 250000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 5
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 40000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 5
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 40000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 6250
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 32000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 50000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = sdmmc_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: sdmmc_clk = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: fixed_div: div = 4
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 50000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = nand_x_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: nand_clk / nand_x_clk = 2
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 200000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: fixed_div: div = 4
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 50000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: name = qspi_clk
<idle>-0 [000] d.... 0.000000: socfpga_clk_get_parent: socfpga_clk_get_parent: qspi_clk = 1
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 3613281
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 400000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 800000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 400000000
<idle>-0 [000] d.... 0.000000: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 133333333
<idle>-0 [000] d.... 0.000000: clk_prepare: osc1
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: osc1
<idle>-0 [000] d.... 0.000000: clk_prepare: main_pll
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: main_pll
<idle>-0 [000] d.... 0.000000: clk_prepare: mpuclk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: mpuclk
<idle>-0 [000] d.... 0.000000: clk_prepare: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_enable: osc1
<idle>-0 [000] d.... 0.000000: clk_enable_complete: osc1
<idle>-0 [000] d.... 0.000000: clk_enable: main_pll
<idle>-0 [000] d.... 0.000000: clk_enable_complete: main_pll
<idle>-0 [000] d.... 0.000000: clk_enable: mpuclk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: mpuclk
<idle>-0 [000] d.... 0.000000: clk_enable: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: mpu_periph_clk
<idle>-0 [000] d.... 0.000000: clk_prepare: periph_pll
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: periph_pll
<idle>-0 [000] d.... 0.000000: clk_prepare: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_prepare: l4_sp_clk
<idle>-0 [000] d.... 0.000000: clk_prepare_complete: l4_sp_clk
<idle>-0 [000] d.... 0.000000: clk_enable: periph_pll
<idle>-0 [000] d.... 0.000000: clk_enable_complete: periph_pll
<idle>-0 [000] d.... 0.000000: clk_enable: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: per_base_clk
<idle>-0 [000] d.... 0.000000: clk_enable: l4_sp_clk
<idle>-0 [000] d.... 0.000000: clk_enable_complete: l4_sp_clk
init-1 [000] .n... 0.033336: clk_prepare: mainclk
init-1 [000] .n... 0.033341: clk_prepare_complete: mainclk
init-1 [000] .n... 0.033343: clk_prepare: l4_main_clk
init-1 [000] .n... 0.033344: clk_prepare_complete: l4_main_clk
init-1 [000] dn... 0.033347: clk_enable: mainclk
init-1 [000] dn... 0.033349: clk_enable_complete: mainclk
init-1 [000] dn... 0.033350: clk_enable: l4_main_clk
init-1 [000] dn... 0.033352: clk_enable_complete: l4_main_clk
init-1 [000] d.... 0.033421: clk_disable: l4_main_clk
init-1 [000] d.... 0.033424: clk_disable_complete: l4_main_clk
init-1 [000] d.... 0.033425: clk_disable: mainclk
init-1 [000] d.... 0.033426: clk_disable_complete: mainclk
init-1 [000] ..... 0.033430: clk_unprepare: l4_main_clk
init-1 [000] ..... 0.033431: clk_unprepare_complete: l4_main_clk
init-1 [000] ..... 0.033432: clk_unprepare: mainclk
init-1 [000] ..... 0.033434: clk_unprepare_complete: mainclk
init-1 [001] ..... 0.125643: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.125651: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.125657: dw8250_set_termios: dw8250_set_termios: rate = 200000000 newrate = 1843200
init-1 [001] ..... 0.125660: dw8250_set_termios: dw8250_set_termios: before: uartclk = 100000000
init-1 [001] ..... 0.125662: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.125664: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.125666: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.125668: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [001] ..... 0.125673: clk_set_rate: l4_sp_clk 200000000
init-1 [001] ..... 0.125675: clk_set_rate_complete: l4_sp_clk 200000000
init-1 [001] ..... 0.125678: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
init-1 [001] ..... 0.125681: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
init-1 [001] ..... 0.125683: dw8250_set_termios: dw8250_set_termios: after: uartclk = 200000000
init-1 [001] .n... 1.732756: clk_prepare: emac1_clk
init-1 [001] .n... 1.732761: clk_prepare_complete: emac1_clk
init-1 [001] .n... 1.732763: clk_prepare: emac_1_clk
init-1 [001] .n... 1.732764: clk_prepare_complete: emac_1_clk
init-1 [001] dn... 1.732767: clk_enable: emac1_clk
init-1 [001] dn... 1.732769: clk_enable_complete: emac1_clk
init-1 [001] dn... 1.732770: clk_enable: emac_1_clk
init-1 [001] dn... 1.732773: clk_enable_complete: emac_1_clk
kworker/1:1-36 [001] d.... 1.952366: clk_disable: emac_1_clk
kworker/1:1-36 [001] d.... 1.952373: clk_disable_complete: emac_1_clk
kworker/1:1-36 [001] d.... 1.952374: clk_disable: emac1_clk
kworker/1:1-36 [001] d.... 1.952376: clk_disable_complete: emac1_clk
kworker/1:1-36 [001] ..... 1.952379: clk_unprepare: emac_1_clk
kworker/1:1-36 [001] ..... 1.952381: clk_unprepare_complete: emac_1_clk
kworker/1:1-36 [001] ..... 1.952382: clk_unprepare: emac1_clk
kworker/1:1-36 [001] ..... 1.952383: clk_unprepare_complete: emac1_clk
init-1 [001] ..... 1.952436: clk_prepare: usb_mp_clk
init-1 [001] ..... 1.952438: clk_prepare_complete: usb_mp_clk
init-1 [001] d.... 1.952441: clk_enable: usb_mp_clk
init-1 [001] d.... 1.952443: clk_enable_complete: usb_mp_clk
kworker/u6:1-33 [001] ..... 2.053196: clk_prepare: l4_mp_clk
kworker/u6:1-33 [001] ..... 2.053201: clk_prepare_complete: l4_mp_clk
kworker/u6:1-33 [001] d.... 2.053203: clk_enable: l4_mp_clk
kworker/u6:1-33 [001] d.... 2.053207: clk_enable_complete: l4_mp_clk
kworker/u6:1-33 [001] ..... 2.053215: clk_prepare: per_nand_mmc_clk
kworker/u6:1-33 [001] ..... 2.053217: clk_prepare_complete: per_nand_mmc_clk
kworker/u6:1-33 [001] ..... 2.053218: clk_prepare: sdmmc_clk
kworker/u6:1-33 [001] ..... 2.053220: clk_prepare_complete: sdmmc_clk
kworker/u6:1-33 [001] ..... 2.053221: clk_prepare: sdmmc_clk_divided
kworker/u6:1-33 [001] ..... 2.053222: clk_prepare_complete: sdmmc_clk_divided
kworker/u6:1-33 [001] d.... 2.053224: clk_enable: per_nand_mmc_clk
kworker/u6:1-33 [001] d.... 2.053225: clk_enable_complete: per_nand_mmc_clk
kworker/u6:1-33 [001] d.... 2.053227: clk_enable: sdmmc_clk
kworker/u6:1-33 [001] d.... 2.053228: clk_enable_complete: sdmmc_clk
kworker/u6:1-33 [001] d.... 2.053230: clk_enable: sdmmc_clk_divided
kworker/u6:1-33 [001] d.... 2.053232: clk_enable_complete: sdmmc_clk_divided
kworker/u5:1-27 [000] ..... 2.319334: clk_prepare: mainclk
kworker/u5:1-27 [000] ..... 2.319339: clk_prepare_complete: mainclk
kworker/u5:1-27 [000] ..... 2.319341: clk_prepare: l4_main_clk
kworker/u5:1-27 [000] ..... 2.319342: clk_prepare_complete: l4_main_clk
kworker/u5:1-27 [000] d.... 2.319345: clk_enable: mainclk
kworker/u5:1-27 [000] d.... 2.319346: clk_enable_complete: mainclk
kworker/u5:1-27 [000] d.... 2.319348: clk_enable: l4_main_clk
kworker/u5:1-27 [000] d.... 2.319350: clk_enable_complete: l4_main_clk
kworker/0:2-50 [000] d.... 2.374974: clk_disable: l4_main_clk
kworker/0:2-50 [000] d.... 2.374980: clk_disable_complete: l4_main_clk
kworker/0:2-50 [000] d.... 2.374981: clk_disable: mainclk
kworker/0:2-50 [000] d.... 2.374986: clk_disable_complete: mainclk
init-1 [000] .n... 2.404394: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] .n... 2.404402: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] .n... 2.404408: dw8250_set_termios: dw8250_set_termios: rate = 200000000 newrate = 1843200
init-1 [000] .n... 2.404411: dw8250_set_termios: dw8250_set_termios: before: uartclk = 100000000
init-1 [000] .n... 2.404413: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] .n... 2.404415: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] .n... 2.404418: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] .n... 2.404419: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] .n... 2.404429: clk_set_rate: l4_sp_clk 200000000
init-1 [000] .n... 2.404431: clk_set_rate_complete: l4_sp_clk 200000000
init-1 [000] .n... 2.404435: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
init-1 [000] .n... 2.404437: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
init-1 [000] .n... 2.404440: dw8250_set_termios: dw8250_set_termios: after: uartclk = 200000000
(udev-worker)-86 [001] ..... 3.002615: clk_prepare: emac1_clk
(udev-worker)-86 [001] ..... 3.002621: clk_prepare_complete: emac1_clk
(udev-worker)-86 [001] ..... 3.002623: clk_prepare: emac_1_clk
(udev-worker)-86 [001] ..... 3.002624: clk_prepare_complete: emac_1_clk
(udev-worker)-86 [001] d.... 3.002628: clk_enable: emac1_clk
(udev-worker)-86 [001] d.... 3.002629: clk_enable_complete: emac1_clk
(udev-worker)-86 [001] d.... 3.002631: clk_enable: emac_1_clk
(udev-worker)-86 [001] d.... 3.002635: clk_enable_complete: emac_1_clk
kworker/1:2-45 [001] d.... 3.012426: clk_disable: emac_1_clk
kworker/1:2-45 [001] d.... 3.012437: clk_disable_complete: emac_1_clk
kworker/1:2-45 [001] d.... 3.012439: clk_disable: emac1_clk
kworker/1:2-45 [001] d.... 3.012440: clk_disable_complete: emac1_clk
kworker/1:2-45 [001] ..... 3.012445: clk_unprepare: emac_1_clk
kworker/1:2-45 [001] ..... 3.012449: clk_unprepare_complete: emac_1_clk
kworker/1:2-45 [001] ..... 3.012453: clk_unprepare: emac1_clk
kworker/1:2-45 [001] ..... 3.012456: clk_unprepare_complete: emac1_clk
(udev-worker)-86 [001] ..... 3.018662: clk_prepare: emac1_clk
(udev-worker)-86 [001] ..... 3.018668: clk_prepare_complete: emac1_clk
(udev-worker)-86 [001] ..... 3.018670: clk_prepare: emac_1_clk
(udev-worker)-86 [001] ..... 3.018671: clk_prepare_complete: emac_1_clk
(udev-worker)-86 [001] d.... 3.018675: clk_enable: emac1_clk
(udev-worker)-86 [001] d.... 3.018677: clk_enable_complete: emac1_clk
(udev-worker)-86 [001] d.... 3.018678: clk_enable: emac_1_clk
(udev-worker)-86 [001] d.... 3.018681: clk_enable_complete: emac_1_clk
kworker/1:2-45 [001] d.... 3.019794: clk_disable: emac_1_clk
kworker/1:2-45 [001] d.... 3.019801: clk_disable_complete: emac_1_clk
kworker/1:2-45 [001] d.... 3.019803: clk_disable: emac1_clk
kworker/1:2-45 [001] d.... 3.019804: clk_disable_complete: emac1_clk
kworker/1:2-45 [001] ..... 3.019808: clk_unprepare: emac_1_clk
kworker/1:2-45 [001] ..... 3.019810: clk_unprepare_complete: emac_1_clk
kworker/1:2-45 [001] ..... 3.019811: clk_unprepare: emac1_clk
kworker/1:2-45 [001] ..... 3.019813: clk_unprepare_complete: emac1_clk
init-1 [000] ..... 3.955433: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 3.955440: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 3.955446: dw8250_set_termios: dw8250_set_termios: rate = 200000000 newrate = 1843200
init-1 [000] ..... 3.955449: dw8250_set_termios: dw8250_set_termios: before: uartclk = 200000000
init-1 [000] ..... 3.955452: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 3.955453: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 3.955455: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 3.955457: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
init-1 [000] ..... 3.955465: clk_set_rate: l4_sp_clk 200000000
init-1 [000] ..... 3.955467: clk_set_rate_complete: l4_sp_clk 200000000
init-1 [000] ..... 3.955471: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
init-1 [000] ..... 3.955473: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
init-1 [000] ..... 3.955476: dw8250_set_termios: dw8250_set_termios: after: uartclk = 200000000
(udev-worker)-228 [000] ..... 5.422835: clk_prepare: emac1_clk
(udev-worker)-228 [000] ..... 5.422842: clk_prepare_complete: emac1_clk
(udev-worker)-228 [000] ..... 5.422843: clk_prepare: emac_1_clk
(udev-worker)-228 [000] ..... 5.422845: clk_prepare_complete: emac_1_clk
(udev-worker)-228 [000] d.... 5.422848: clk_enable: emac1_clk
(udev-worker)-228 [000] d.... 5.422850: clk_enable_complete: emac1_clk
(udev-worker)-228 [000] d.... 5.422851: clk_enable: emac_1_clk
(udev-worker)-228 [000] d.... 5.422855: clk_enable_complete: emac_1_clk
kworker/0:2-50 [000] d.... 5.432702: clk_disable: emac_1_clk
kworker/0:2-50 [000] d.... 5.432710: clk_disable_complete: emac_1_clk
kworker/0:2-50 [000] d.... 5.432712: clk_disable: emac1_clk
kworker/0:2-50 [000] d.... 5.432714: clk_disable_complete: emac1_clk
kworker/0:2-50 [000] ..... 5.432718: clk_unprepare: emac_1_clk
kworker/0:2-50 [000] ..... 5.432719: clk_unprepare_complete: emac_1_clk
kworker/0:2-50 [000] ..... 5.432721: clk_unprepare: emac1_clk
kworker/0:2-50 [000] ..... 5.432722: clk_unprepare_complete: emac1_clk
(udev-worker)-228 [000] ..... 5.444087: clk_prepare: emac1_clk
(udev-worker)-228 [000] ..... 5.444092: clk_prepare_complete: emac1_clk
(udev-worker)-228 [000] ..... 5.444094: clk_prepare: emac_1_clk
(udev-worker)-228 [000] ..... 5.444095: clk_prepare_complete: emac_1_clk
(udev-worker)-228 [000] d.... 5.444098: clk_enable: emac1_clk
(udev-worker)-228 [000] d.... 5.444100: clk_enable_complete: emac1_clk
(udev-worker)-228 [000] d.... 5.444101: clk_enable: emac_1_clk
(udev-worker)-228 [000] d.... 5.444105: clk_enable_complete: emac_1_clk
kworker/0:2-50 [000] d.... 5.444435: clk_disable: emac_1_clk
kworker/0:2-50 [000] d.... 5.444441: clk_disable_complete: emac_1_clk
kworker/0:2-50 [000] d.... 5.444443: clk_disable: emac1_clk
kworker/0:2-50 [000] d.... 5.444444: clk_disable_complete: emac1_clk
kworker/0:2-50 [000] ..... 5.444448: clk_unprepare: emac_1_clk
kworker/0:2-50 [000] ..... 5.444450: clk_unprepare_complete: emac_1_clk
kworker/0:2-50 [000] ..... 5.444451: clk_unprepare: emac1_clk
kworker/0:2-50 [000] ..... 5.444452: clk_unprepare_complete: emac1_clk
(udev-worker)-228 [000] ..... 5.463489: clk_prepare: emac1_clk
(udev-worker)-228 [000] ..... 5.463494: clk_prepare_complete: emac1_clk
(udev-worker)-228 [000] ..... 5.463496: clk_prepare: emac_1_clk
(udev-worker)-228 [000] ..... 5.463497: clk_prepare_complete: emac_1_clk
(udev-worker)-228 [000] d.... 5.463501: clk_enable: emac1_clk
(udev-worker)-228 [000] d.... 5.463503: clk_enable_complete: emac1_clk
(udev-worker)-228 [000] d.... 5.463504: clk_enable: emac_1_clk
(udev-worker)-228 [000] d.... 5.463507: clk_enable_complete: emac_1_clk
kworker/0:2-50 [000] d.... 5.465073: clk_disable: emac_1_clk
kworker/0:2-50 [000] d.... 5.465084: clk_disable_complete: emac_1_clk
kworker/0:2-50 [000] d.... 5.465085: clk_disable: emac1_clk
kworker/0:2-50 [000] d.... 5.465087: clk_disable_complete: emac1_clk
kworker/0:2-50 [000] ..... 5.465091: clk_unprepare: emac_1_clk
kworker/0:2-50 [000] ..... 5.465093: clk_unprepare_complete: emac_1_clk
kworker/0:2-50 [000] ..... 5.465094: clk_unprepare: emac1_clk
kworker/0:2-50 [000] ..... 5.465096: clk_unprepare_complete: emac1_clk
ip-777 [001] ..... 11.417588: clk_prepare: emac1_clk
ip-777 [001] ..... 11.417594: clk_prepare_complete: emac1_clk
ip-777 [001] ..... 11.417596: clk_prepare: emac_1_clk
ip-777 [001] ..... 11.417597: clk_prepare_complete: emac_1_clk
ip-777 [001] d.... 11.417600: clk_enable: emac1_clk
ip-777 [001] d.... 11.417602: clk_enable_complete: emac1_clk
ip-777 [001] d.... 11.417603: clk_enable: emac_1_clk
ip-777 [001] d.... 11.417606: clk_enable_complete: emac_1_clk
getty-1283 [001] ..... 19.978213: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1283 [001] ..... 19.978220: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1283 [001] ..... 19.978226: dw8250_set_termios: dw8250_set_termios: rate = 200000000 newrate = 1843200
getty-1283 [001] ..... 19.978229: dw8250_set_termios: dw8250_set_termios: before: uartclk = 200000000
getty-1283 [001] ..... 19.978231: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1283 [001] ..... 19.978233: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1283 [001] ..... 19.978235: clk_rate_request_start: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1283 [001] ..... 19.978237: clk_rate_request_done: l4_sp_clk min 0 max 4294967295, parent per_base_clk (200000000)
getty-1283 [001] ..... 19.978245: clk_set_rate: l4_sp_clk 200000000
getty-1283 [001] ..... 19.978247: clk_set_rate_complete: l4_sp_clk 200000000
getty-1283 [001] ..... 19.978251: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: div_reg: div = 2
getty-1283 [001] ..... 19.978254: socfpga_clk_recalc_rate: socfpga_clk_recalc_rate: rate = 100000000
getty-1283 [001] ..... 19.978256: dw8250_set_termios: dw8250_set_termios: after: uartclk = 200000000
---
drivers/clk/socfpga/clk-gate.c | 43 ++++++++++++++++++++++-------
drivers/tty/serial/8250/8250_dw.c | 3 ++
drivers/tty/serial/8250/8250_port.c | 2 ++
3 files changed, 38 insertions(+), 10 deletions(-)
diff --git a/drivers/clk/socfpga/clk-gate.c b/drivers/clk/socfpga/clk-gate.c
index 47500976f987..48e5c241f528 100644
--- a/drivers/clk/socfpga/clk-gate.c
+++ b/drivers/clk/socfpga/clk-gate.c
@@ -31,26 +31,39 @@ static u8 socfpga_clk_get_parent(struct clk_hw *hwclk)
u32 l4_src;
u32 perpll_src;
const char *name = clk_hw_get_name(hwclk);
+ u8 ret;
+
+ trace_printk("%s: name = %s\n", __func__, name);
if (streq(name, SOCFPGA_L4_MP_CLK)) {
l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
- return l4_src & 0x1;
+ ret = l4_src & 0x1;
+ trace_printk("%s: l4_mp_clk = %d\n", __func__, ret);
+ return ret;
}
if (streq(name, SOCFPGA_L4_SP_CLK)) {
l4_src = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
- return !!(l4_src & 2);
+ ret = !!(l4_src & 2);
+ trace_printk("%s: l4_sp_clk = %d\n", __func__, ret);
+ return ret;
}
perpll_src = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
- if (streq(name, SOCFPGA_MMC_CLK))
- return perpll_src & 0x3;
+ if (streq(name, SOCFPGA_MMC_CLK)) {
+ ret = perpll_src & 0x3;
+ trace_printk("%s: sdmmc_clk = %d\n", __func__, ret);
+ return ret;
+ }
if (streq(name, SOCFPGA_NAND_CLK) ||
- streq(name, SOCFPGA_NAND_X_CLK))
- return (perpll_src >> 2) & 3;
-
+ streq(name, SOCFPGA_NAND_X_CLK)) {
+ ret = (perpll_src >> 2) & 3;
+ trace_printk("%s: nand_clk / nand_x_clk = %d\n", __func__, ret);
+ return ret;
+ }
/* QSPI clock */
- return (perpll_src >> 4) & 3;
-
+ ret = (perpll_src >> 4) & 3;
+ trace_printk("%s: qspi_clk = %d\n", __func__, ret);
+ return ret;
}
static int socfpga_clk_set_parent(struct clk_hw *hwclk, u8 parent)
@@ -63,23 +76,28 @@ static int socfpga_clk_set_parent(struct clk_hw *hwclk, u8 parent)
src_reg &= ~0x1;
src_reg |= parent;
writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC);
+ trace_printk("%s: l4_mp_clk: src_reg = %d\n", __func__, src_reg);
} else if (streq(name, SOCFPGA_L4_SP_CLK)) {
src_reg = readl(clk_mgr_base_addr + CLKMGR_L4SRC);
src_reg &= ~0x2;
src_reg |= (parent << 1);
writel(src_reg, clk_mgr_base_addr + CLKMGR_L4SRC);
+ trace_printk("%s: l4_sp_clk: src_reg = %d\n", __func__, src_reg);
} else {
src_reg = readl(clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
if (streq(name, SOCFPGA_MMC_CLK)) {
src_reg &= ~0x3;
src_reg |= parent;
+ trace_printk("%s: sdmmc_clk: src_reg = %d\n", __func__, src_reg);
} else if (streq(name, SOCFPGA_NAND_CLK) ||
streq(name, SOCFPGA_NAND_X_CLK)) {
src_reg &= ~0xC;
src_reg |= (parent << 2);
+ trace_printk("%s: nand_clk: src_reg = %d\n", __func__, src_reg);
} else {/* QSPI clock */
src_reg &= ~0x30;
src_reg |= (parent << 4);
+ trace_printk("%s: qspi_clk: src_reg = %d\n", __func__, src_reg);
}
writel(src_reg, clk_mgr_base_addr + CLKMGR_PERPLL_SRC);
}
@@ -93,8 +111,10 @@ static unsigned long socfpga_clk_recalc_rate(struct clk_hw *hwclk,
struct socfpga_gate_clk *socfpgaclk = to_socfpga_gate_clk(hwclk);
u32 div = 1, val;
- if (socfpgaclk->fixed_div)
+ if (socfpgaclk->fixed_div) {
div = socfpgaclk->fixed_div;
+ trace_printk("%s: fixed_div: div = %d\n", __func__, div);
+ }
else if (socfpgaclk->div_reg) {
val = readl(socfpgaclk->div_reg) >> socfpgaclk->shift;
val &= GENMASK(socfpgaclk->width - 1, 0);
@@ -103,8 +123,11 @@ static unsigned long socfpga_clk_recalc_rate(struct clk_hw *hwclk,
div = val + 1;
else
div = (1 << val);
+ trace_printk("%s: div_reg: div = %d\n", __func__, div);
}
+ trace_printk("%s: rate = %ld\n", __func__, parent_rate / div);
+
return parent_rate / div;
}
diff --git a/drivers/tty/serial/8250/8250_dw.c b/drivers/tty/serial/8250/8250_dw.c
index f4cafca1a7da..1e21ef8b046c 100644
--- a/drivers/tty/serial/8250/8250_dw.c
+++ b/drivers/tty/serial/8250/8250_dw.c
@@ -359,6 +359,8 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
clk_disable_unprepare(d->clk);
rate = clk_round_rate(d->clk, newrate);
+ trace_printk("%s: rate = %ld newrate = %ld\n", __func__, rate, newrate);
+ trace_printk("%s: before: uartclk = %d\n", __func__, p->uartclk);
if (rate > 0) {
/*
* Note that any clock-notifer worker will block in
@@ -368,6 +370,7 @@ static void dw8250_set_termios(struct uart_port *p, struct ktermios *termios,
if (!ret)
p->uartclk = rate;
}
+ trace_printk("%s: after: uartclk = %d\n", __func__, p->uartclk);
clk_prepare_enable(d->clk);
dw8250_do_set_termios(p, termios, old);
diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c
index 141627370aab..61f278e8d41b 100644
--- a/drivers/tty/serial/8250/8250_port.c
+++ b/drivers/tty/serial/8250/8250_port.c
@@ -2758,6 +2758,8 @@ void serial8250_update_uartclk(struct uart_port *port, unsigned int uartclk)
uart_update_timeout(port, termios->c_cflag, baud);
+ trace_printk("%s: %s: uartclk: %d baud: %d quot: %d frac: %d\n",
+ __func__, port->name, uartclk, baud, quot, frac);
serial8250_set_divisor(port, baud, quot, frac);
serial_port_out(port, UART_LCR, up->lcr);
--
2.30.2
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