linux-kernel - [PATCH 3/7] clk: stm32: Fix ltdc's clock turn off by clk_disable

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Date:   Thu, 20 May 2021 19:05:23 +0800
From:   dillon.minfei@...il.com
To:     mchehab@...nel.org, mchehab+huawei@...nel.org,
        hverkuil-cisco@...all.nl, ezequiel@...labora.com, gnurou@...il.com,
        pihsun@...omium.org, mcoquelin.stm32@...il.com,
        alexandre.torgue@...s.st.com, mturquette@...libre.com,
        sboyd@...nel.org, robh+dt@...nel.org
Cc:     patrice.chotard@...s.st.com, hugues.fruchet@...s.st.com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-clk@...r.kernel.org,
        devicetree@...r.kernel.org, Dillon Min <dillon.minfei@...il.com>
Subject: [PATCH 3/7] 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>
Acked-by: Stephen Boyd <sboyd@...nel.org>
Link: https://lore.kernel.org/linux-arm-kernel/1590564453-24499-7-git-send-email-dillon.minfei@gmail.com/
---

This patch was submitted in
https://lore.kernel.org/lkml/1620990152-19255-1-git-send-email-dillon.minfei@gmail.com/

 drivers/clk/clk-stm32f4.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 18117ce5ff85..b6ab8c3a7994 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -211,7 +211,6 @@ static const struct stm32f4_gate_data stm32f469_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 stm32f746_gates[] __initconst = {
@@ -557,13 +556,13 @@ static const struct clk_div_table post_divr_table[] = {
 
 #define MAX_POST_DIV 3
 static const struct stm32f4_pll_post_div_data  post_div_data[MAX_POST_DIV] = {
-	{ CLK_I2SQ_PDIV, PLL_I2S, "plli2s-q-div", "plli2s-q",
+	{ CLK_I2SQ_PDIV, PLL_VCO_I2S, "plli2s-q-div", "plli2s-q",
 		CLK_SET_RATE_PARENT, STM32F4_RCC_DCKCFGR, 0, 5, 0, NULL},
 
-	{ CLK_SAIQ_PDIV, PLL_SAI, "pllsai-q-div", "pllsai-q",
+	{ CLK_SAIQ_PDIV, PLL_VCO_SAI, "pllsai-q-div", "pllsai-q",
 		CLK_SET_RATE_PARENT, STM32F4_RCC_DCKCFGR, 8, 5, 0, NULL },
 
-	{ NO_IDX, PLL_SAI, "pllsai-r-div", "pllsai-r", CLK_SET_RATE_PARENT,
+	{ NO_IDX, PLL_VCO_SAI, "pllsai-r-div", "pllsai-r", CLK_SET_RATE_PARENT,
 		STM32F4_RCC_DCKCFGR, 16, 2, 0, post_divr_table },
 };
 
-- 
2.7.4