linux-kernel - [PATCH v3] clk: qcom: clk-alpha-pll: Fix pll post div mask when width is not set

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Message-Id: <20241006-fix-postdiv-mask-v3-1-160354980433@mainlining.org>
Date: Sun, 06 Oct 2024 22:51:58 +0200
From: Barnabás Czémán <barnabas.czeman@...nlining.org>
To: Bjorn Andersson <andersson@...nel.org>, 
 Michael Turquette <mturquette@...libre.com>, 
 Stephen Boyd <sboyd@...nel.org>, 
 Satya Priya Kakitapalli <quic_skakitap@...cinc.com>, 
 Konrad Dybcio <konradybcio@...nel.org>, 
 Abhishek Sahu <absahu@...eaurora.org>
Cc: linux-arm-msm@...r.kernel.org, linux-clk@...r.kernel.org, 
 linux-kernel@...r.kernel.org, Stephen Boyd <sboyd@...eaurora.org>, 
 Barnabás Czémán <barnabas.czeman@...nlining.org>
Subject: [PATCH v3] clk: qcom: clk-alpha-pll: Fix pll post div mask when
 width is not set

Many qcom clock drivers do not have .width set. In that case value of
(p)->width - 1 will be negative which breaks clock tree. Fix this
by checking if width is zero, and pass 3 to GENMASK if that's the case.

Fixes: 1c3541145cbf ("clk: qcom: support for 2 bit PLL post divider")
Signed-off-by: Barnabás Czémán <barnabas.czeman@...nlining.org>
---
Changes in v3:
- Remove one of the fixes tag.
- Link to v2: https://lore.kernel.org/r/20240925-fix-postdiv-mask-v2-1-b825048b828b@mainlining.org

Changes in v2:
- Pass 3 to GENMASK instead of 0.
- Add more Fixes tag for reference root cause.
- Link to v1: https://lore.kernel.org/r/20240925-fix-postdiv-mask-v1-1-f70ba55f415e@mainlining.org
---
 drivers/clk/qcom/clk-alpha-pll.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/clk/qcom/clk-alpha-pll.c b/drivers/clk/qcom/clk-alpha-pll.c
index f9105443d7dbb104e3cb091e59f43df25999f8b3..be9bee6ab65f6e08d5ae764d94a92e395e227fbc 100644
--- a/drivers/clk/qcom/clk-alpha-pll.c
+++ b/drivers/clk/qcom/clk-alpha-pll.c
@@ -40,7 +40,7 @@
 
 #define PLL_USER_CTL(p)		((p)->offset + (p)->regs[PLL_OFF_USER_CTL])
 # define PLL_POST_DIV_SHIFT	8
-# define PLL_POST_DIV_MASK(p)	GENMASK((p)->width - 1, 0)
+# define PLL_POST_DIV_MASK(p)	GENMASK((p)->width ? (p)->width - 1 : 3, 0)
 # define PLL_ALPHA_MSB		BIT(15)
 # define PLL_ALPHA_EN		BIT(24)
 # define PLL_ALPHA_MODE		BIT(25)

---
base-commit: 58ca61c1a866bfdaa5e19fb19a2416764f847d75
change-id: 20240925-fix-postdiv-mask-ba47ecd23ea3

Best regards,
-- 
Barnabás Czémán <barnabas.czeman@...nlining.org>