linux-kernel - [PATCH v2 5/6] clk: samsung: gs101: don't mark non-essential clocks as critical

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20240130093812.1746512-6-andre.draszik@linaro.org>
Date: Tue, 30 Jan 2024 09:36:44 +0000
From: André Draszik <andre.draszik@...aro.org>
To: peter.griffin@...aro.org,
	mturquette@...libre.com,
	sboyd@...nel.org,
	robh+dt@...nel.org,
	krzysztof.kozlowski+dt@...aro.org,
	conor+dt@...nel.org
Cc: linux-kernel@...r.kernel.org,
	kernel-team@...roid.com,
	tudor.ambarus@...aro.org,
	willmcvicker@...gle.com,
	semen.protsenko@...aro.org,
	alim.akhtar@...sung.com,
	s.nawrocki@...sung.com,
	tomasz.figa@...il.com,
	cw00.choi@...sung.com,
	linux-arm-kernel@...ts.infradead.org,
	linux-samsung-soc@...r.kernel.org,
	linux-clk@...r.kernel.org,
	devicetree@...r.kernel.org,
	André Draszik <andre.draszik@...aro.org>
Subject: [PATCH v2 5/6] clk: samsung: gs101: don't mark non-essential clocks as critical

The peric0_top1_ipclk_0 and peric0_top1_pclk_0 are the clocks going to
peric0/uart_usi, with pclk being the bus clock. Without pclk running,
any bus access will hang.
Unfortunately, in commit d97b6c902a40 ("arm64: dts: exynos: gs101:
update USI UART to use peric0 clocks") the gs101 DT ended up specifying
an incorrect pclk in the respective node and instead the two clocks
here were marked as critical.

We have fixed the gs101 DT and can therefore drop this incorrect
work-around here, the uart driver will claim these clocks as needed.

Note that this commit has the side-effect of causing earlycon to stop
to work sometime into the boot for two reasons:
    * peric0_top1_ipclk_0 requires its parent gout_cmu_peric0_ip to be
      running, but because earlycon doesn't deal with clocks that
      parent will be disabled when none of the other drivers that
      actually deal with clocks correctly require it to be running and
      the real serial driver (which does deal with clocks) hasn't taken
      over yet
    * hand-over between earlycon and serial driver appears to be
      fragile and clocks get enabled and disabled a few times, which
      also causes register access to hang while earlycon is still
      active
Nonetheless we shouldn't keep these clocks running unconditionally just
for earlycon. Clocks should be disabled where possible. If earlycon is
required in the future, e.g. for debug, this commit can simply be
reverted (locally!).

Fixes: 893f133a040b ("clk: samsung: gs101: add support for cmu_peric0")
Signed-off-by: André Draszik <andre.draszik@...aro.org>
Reviewed-by: Tudor Ambarus <tudor.ambarus@...aro.org>
Reviewed-by: Sam Protsenko <semen.protsenko@...aro.org>

---
v2:
* collect Reviewed-by: tags
---
 drivers/clk/samsung/clk-gs101.c | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/samsung/clk-gs101.c b/drivers/clk/samsung/clk-gs101.c
index 61bb0dcf84ee..5c338ac9231c 100644
--- a/drivers/clk/samsung/clk-gs101.c
+++ b/drivers/clk/samsung/clk-gs101.c
@@ -2982,20 +2982,18 @@ static const struct samsung_gate_clock peric0_gate_clks[] __initconst = {
 	     "gout_peric0_peric0_top0_pclk_9", "mout_peric0_bus_user",
 	     CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP0_IPCLKPORT_PCLK_9,
 	     21, 0, 0),
-	/* Disabling this clock makes the system hang. Mark the clock as critical. */
 	GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_0,
 	     "gout_peric0_peric0_top1_ipclk_0", "dout_peric0_usi0_uart",
 	     CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP1_IPCLKPORT_IPCLK_0,
-	     21, CLK_IS_CRITICAL, 0),
+	     21, 0, 0),
 	GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_IPCLK_2,
 	     "gout_peric0_peric0_top1_ipclk_2", "dout_peric0_usi14_usi",
 	     CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP1_IPCLKPORT_IPCLK_2,
 	     21, 0, 0),
-	/* Disabling this clock makes the system hang. Mark the clock as critical. */
 	GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_0,
 	     "gout_peric0_peric0_top1_pclk_0", "mout_peric0_bus_user",
 	     CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP1_IPCLKPORT_PCLK_0,
-	     21, CLK_IS_CRITICAL, 0),
+	     21, 0, 0),
 	GATE(CLK_GOUT_PERIC0_PERIC0_TOP1_PCLK_2,
 	     "gout_peric0_peric0_top1_pclk_2", "mout_peric0_bus_user",
 	     CLK_CON_GAT_GOUT_BLK_PERIC0_UID_PERIC0_TOP1_IPCLKPORT_PCLK_2,
-- 
2.43.0.429.g432eaa2c6b-goog