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Date: Thu, 12 Mar 2020 16:04:57 +0530
From: Anand Moon <linux.amoon@...il.com>
To: Krzysztof Kozlowski <krzk@...nel.org>
Cc: Linux USB Mailing List <linux-usb@...r.kernel.org>,
devicetree <devicetree@...r.kernel.org>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
linux-samsung-soc@...r.kernel.org,
Linux Kernel <linux-kernel@...r.kernel.org>,
"open list:COMMON CLK FRAMEWORK" <linux-clk@...r.kernel.org>,
Rob Herring <robh+dt@...nel.org>,
Kukjin Kim <kgene@...nel.org>,
Marek Szyprowski <m.szyprowski@...sung.com>,
Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>,
Felipe Balbi <balbi@...nel.org>,
Sylwester Nawrocki <s.nawrocki@...sung.com>,
Tomasz Figa <tomasz.figa@...il.com>,
Chanwoo Choi <cw00.choi@...sung.com>,
Michael Turquette <mturquette@...libre.com>,
Stephen Boyd <sboyd@...nel.org>
Subject: Re: [PATCHv3 5/5] clk: samsung: exynos542x: Move FSYS subsystem
clocks to its sub-CMU
Hi Krzysztof,
Thanks for your review comments.
On Wed, 11 Mar 2020 at 20:12, Krzysztof Kozlowski <krzk@...nel.org> wrote:
>
> On Tue, Mar 10, 2020 at 07:48:54PM +0000, Anand Moon wrote:
> > FSYS power domain support usbdrd3, pdma and usb2 power gaiting,
> > hence move FSYS clk setting to sub-CMU block to support power domain
> > on/off sequences for device nodes.
> >
> > Signed-off-by: Anand Moon <linux.amoon@...il.com>
> > ---
> > New patch in the series
> > ---
> > drivers/clk/samsung/clk-exynos5420.c | 45 +++++++++++++++++++++-------
> > 1 file changed, 34 insertions(+), 11 deletions(-)
> >
> > diff --git a/drivers/clk/samsung/clk-exynos5420.c b/drivers/clk/samsung/clk-exynos5420.c
> > index c9e5a1fb6653..6c4c47dfcdce 100644
> > --- a/drivers/clk/samsung/clk-exynos5420.c
> > +++ b/drivers/clk/samsung/clk-exynos5420.c
> > @@ -859,12 +859,6 @@ static const struct samsung_div_clock exynos5x_div_clks[] __initconst = {
> > DIV(0, "dout_maudio0", "mout_maudio0", DIV_MAU, 20, 4),
> > DIV(0, "dout_maupcm0", "dout_maudio0", DIV_MAU, 24, 8),
> >
> > - /* USB3.0 */
> > - DIV(0, "dout_usbphy301", "mout_usbd301", DIV_FSYS0, 12, 4),
> > - DIV(0, "dout_usbphy300", "mout_usbd300", DIV_FSYS0, 16, 4),
> > - DIV(0, "dout_usbd301", "mout_usbd301", DIV_FSYS0, 20, 4),
> > - DIV(0, "dout_usbd300", "mout_usbd300", DIV_FSYS0, 24, 4),
>
> According to clock diagram these are still in CMU TOP, not FSYS.
>
> > -
> > /* MMC */
> > DIV(0, "dout_mmc0", "mout_mmc0", DIV_FSYS1, 0, 10),
> > DIV(0, "dout_mmc1", "mout_mmc1", DIV_FSYS1, 10, 10),
> > @@ -1031,8 +1025,6 @@ static const struct samsung_gate_clock exynos5x_gate_clks[] __initconst = {
> />
> > /* FSYS Block */
> > GATE(CLK_TSI, "tsi", "aclk200_fsys", GATE_BUS_FSYS0, 0, 0, 0),
> > - GATE(CLK_PDMA0, "pdma0", "aclk200_fsys", GATE_BUS_FSYS0, 1, 0, 0),
> > - GATE(CLK_PDMA1, "pdma1", "aclk200_fsys", GATE_BUS_FSYS0, 2, 0, 0),
> > GATE(CLK_UFS, "ufs", "aclk200_fsys2", GATE_BUS_FSYS0, 3, 0, 0),
> > GATE(CLK_RTIC, "rtic", "aclk200_fsys", GATE_IP_FSYS, 9, 0, 0),
> > GATE(CLK_MMC0, "mmc0", "aclk200_fsys2", GATE_IP_FSYS, 12, 0, 0),
> > @@ -1040,9 +1032,6 @@ static const struct samsung_gate_clock exynos5x_gate_clks[] __initconst = {
> > GATE(CLK_MMC2, "mmc2", "aclk200_fsys2", GATE_IP_FSYS, 14, 0, 0),
> > GATE(CLK_SROMC, "sromc", "aclk200_fsys2",
> > GATE_IP_FSYS, 17, CLK_IGNORE_UNUSED, 0),
> > - GATE(CLK_USBH20, "usbh20", "aclk200_fsys", GATE_IP_FSYS, 18, 0, 0),
> > - GATE(CLK_USBD300, "usbd300", "aclk200_fsys", GATE_IP_FSYS, 19, 0, 0),
> > - GATE(CLK_USBD301, "usbd301", "aclk200_fsys", GATE_IP_FSYS, 20, 0, 0),
> > GATE(CLK_SCLK_UNIPRO, "sclk_unipro", "dout_unipro",
> > SRC_MASK_FSYS, 24, CLK_SET_RATE_PARENT, 0),
> >
> > @@ -1258,6 +1247,28 @@ static struct exynos5_subcmu_reg_dump exynos5x_gsc_suspend_regs[] = {
> > { DIV2_RATIO0, 0, 0x30 }, /* DIV dout_gscl_blk_300 */
> > };
> >
> > +/* USB3.0 */
> > +static const struct samsung_div_clock exynos5x_fsys_div_clks[] __initconst = {
> > + DIV(0, "dout_usbphy301", "mout_usbd301", DIV_FSYS0, 12, 4),
> > + DIV(0, "dout_usbphy300", "mout_usbd300", DIV_FSYS0, 16, 4),
> > + DIV(0, "dout_usbd301", "mout_usbd301", DIV_FSYS0, 20, 4),
> > + DIV(0, "dout_usbd300", "mout_usbd300", DIV_FSYS0, 24, 4),
> > +};
> > +
> > +static const struct samsung_gate_clock exynos5x_fsys_gate_clks[] __initconst = {
> > + GATE(CLK_PDMA0, "pdma0", "aclk200_fsys", GATE_BUS_FSYS0, 1, 0, 0),
> > + GATE(CLK_PDMA1, "pdma1", "aclk200_fsys", GATE_BUS_FSYS0, 2, 0, 0),
> > + GATE(CLK_USBH20, "usbh20", "aclk200_fsys", GATE_IP_FSYS, 18, 0, 0),
> > + GATE(CLK_USBD300, "usbd300", "aclk200_fsys", GATE_IP_FSYS, 19, 0, 0),
> > + GATE(CLK_USBD301, "usbd301", "aclk200_fsys", GATE_IP_FSYS, 20, 0, 0),
> > +};
> > +
> > +static struct exynos5_subcmu_reg_dump exynos5x_fsys_suspend_regs[] = {
> > + { GATE_IP_FSYS, 0xffffffff, 0xffffffff }, /* FSYS gates */
>
> This looks wrong. GATE_IP_FSYS has fields also for FSYS2 clocks which
> you are not suspending. They do not belong to this CMU.
>
Ok. I change the from GATE_IP_FSYS to GATE_BUS_FSYS0 in the above
exynos5x_fsys_gate_clks to make this consistent to used GATE_BUS_FSYS0 for CMU,
with this change it works as per previously.
> Don't you need to save also parts of GATE_BUS_FSYS0?
GATE_BUS_FSYS0 and GATE_IP_FSYS are already part of list
of control register which are saved and restored during suspend and resume
so no point in adding this here, I should drop the GATE_IP_FSYS reg
dump over here.
>
> > + { SRC_TOP3, 0, BIT(24) }, /* SW_MUX_PCLK_200_FSYS_SEL */
> > + { SRC_TOP3, 0, BIT(28) }, /* SW_MUX_ACLK_200_FSYS_SEL */
>
> Name of clocks from the driver please, not from datasheet. Look at other
> examples.
>
Ok I will update this as per the examples.
> Best regards,
> Krzysztof
>
>
-Anand
> > +};
> > +
> > static const struct samsung_gate_clock exynos5x_g3d_gate_clks[] __initconst = {
> > GATE(CLK_G3D, "g3d", "mout_user_aclk_g3d", GATE_IP_G3D, 9,
> > CLK_SET_RATE_PARENT, 0),
> > @@ -1376,12 +1387,23 @@ static const struct exynos5_subcmu_info exynos5800_mau_subcmu = {
> > .pd_name = "MAU",
> > };
> >
> > +static const struct exynos5_subcmu_info exynos5x_fsys_subcmu = {
> > + .div_clks = exynos5x_fsys_div_clks,
> > + .nr_div_clks = ARRAY_SIZE(exynos5x_fsys_div_clks),
> > + .gate_clks = exynos5x_fsys_gate_clks,
> > + .nr_gate_clks = ARRAY_SIZE(exynos5x_fsys_gate_clks),
> > + .suspend_regs = exynos5x_fsys_suspend_regs,
> > + .nr_suspend_regs = ARRAY_SIZE(exynos5x_fsys_suspend_regs),
> > + .pd_name = "FSYS",
> > +};
> > +
> > static const struct exynos5_subcmu_info *exynos5x_subcmus[] = {
> > &exynos5x_disp_subcmu,
> > &exynos5x_gsc_subcmu,
> > &exynos5x_g3d_subcmu,
> > &exynos5x_mfc_subcmu,
> > &exynos5x_mscl_subcmu,
> > + &exynos5x_fsys_subcmu,
> > };
> >
> > static const struct exynos5_subcmu_info *exynos5800_subcmus[] = {
> > @@ -1391,6 +1413,7 @@ static const struct exynos5_subcmu_info *exynos5800_subcmus[] = {
> > &exynos5x_mfc_subcmu,
> > &exynos5x_mscl_subcmu,
> > &exynos5800_mau_subcmu,
> > + &exynos5x_fsys_subcmu,
> > };
> >
> > static const struct samsung_pll_rate_table exynos5420_pll2550x_24mhz_tbl[] __initconst = {
> > --
> > 2.25.1
> >
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