linux-kernel - [PATCH v6 6/9] clk: stm32: Fix ltdc's clock turn off by clk_disable

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Message-Id: <1590564453-24499-7-git-send-email-dillon.minfei@gmail.com>
Date:   Wed, 27 May 2020 15:27:30 +0800
From:   dillon.minfei@...il.com
To:     robh+dt@...nel.org, p.zabel@...gutronix.de,
        mcoquelin.stm32@...il.com, alexandre.torgue@...com,
        thierry.reding@...il.com, sam@...nborg.org, airlied@...ux.ie,
        daniel@...ll.ch, mturquette@...libre.com, sboyd@...nel.org,
        andy.shevchenko@...il.com, noralf@...nnes.org,
        linus.walleij@...aro.org, broonie@...nel.org
Cc:     devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        dri-devel@...ts.freedesktop.org, linux-clk@...r.kernel.org,
        dillonhua@...il.com, dillon min <dillon.minfei@...il.com>
Subject: [PATCH v6 6/9] clk: stm32: Fix ltdc's clock turn off by clk_disable_unused() after kernel startup

From: dillon min <dillon.minfei@...il.com>

stm32's clk driver register two ltdc gate clk to clk core by
clk_hw_register_gate() and clk_hw_register_composite()

first: 'stm32f429_gates[]', clk name is 'ltdc', which no user to use.
second: 'stm32f429_aux_clk[]', clk name is 'lcd-tft', used by ltdc driver

both of them point to the same offset of stm32's RCC register. after
kernel enter console, clk core turn off ltdc's clk as 'stm32f429_gates[]'
is no one to use. but, actually 'stm32f429_aux_clk[]' is in use.

Fixes: daf2d117cbca ("clk: stm32f4: Add lcd-tft clock")
Signed-off-by: dillon min <dillon.minfei@...il.com>
---

Changes since V5:
separate '[PATCH v5 5/8]' to two, add Fixes tags.

 drivers/clk/clk-stm32f4.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 42ca2dd86aea..fa62e990c539 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -129,7 +129,6 @@ static const struct stm32f4_gate_data stm32f429_gates[] __initconst = {
 	{ STM32F4_RCC_APB2ENR, 20,	"spi5",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 21,	"spi6",		"apb2_div" },
 	{ STM32F4_RCC_APB2ENR, 22,	"sai1",		"apb2_div" },
-	{ STM32F4_RCC_APB2ENR, 26,	"ltdc",		"apb2_div" },
 };
 
 static const struct stm32f4_gate_data stm32f469_gates[] __initconst = {
-- 
2.7.4