linux-kernel - [PATCH 2/4] fix hang in ltdc driver loading bug, add CLK_IGNORE

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Date:   Thu, 30 Apr 2020 17:43:44 +0800
From:   dillon.minfei@...il.com
To:     alexandre.torgue@...com
Cc:     sboyd@...nel.org, mcoquelin.stm32@...il.com,
        mturquette@...libre.com, linux-clk@...r.kernel.org,
        linux-stm32@...md-mailman.stormreply.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        dillon.minfei@...il.com
Subject: [PATCH 2/4] fix hang in ltdc driver loading bug, add CLK_IGNORE_UNUSED for ltdc

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

1) in clk-stm32f4.c set clk_hw to the wrong offset PLL_VCO_SAI, PLL_VCO_I2S
   of clks array, should change to PLL_SAI, PLL_I2S, otherwise get null from
   to_clk_gate

2) add CLK_IGNORE_UNUSED for ltdc, otherwise system will close ltdc clk
   before filesystem mount

Signed-off-by: dillon min <dillon.minfei@...il.com>
---
 drivers/clk/clk-stm32f4.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 18117ce..bdebe05 100644
--- a/drivers/clk/clk-stm32f4.c
+++ b/drivers/clk/clk-stm32f4.c
@@ -129,7 +129,8 @@ 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" },
+	{ STM32F4_RCC_APB2ENR, 26,	"ltdc",		"apb2_div",
+		CLK_IGNORE_UNUSED },
 };
 
 static const struct stm32f4_gate_data stm32f469_gates[] __initconst = {
@@ -1754,10 +1755,10 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 	stm32f4_rcc_register_pll("vco_in", &data->pll_data[0],
 			&stm32f4_clk_lock);
 
-	clks[PLL_VCO_I2S] = stm32f4_rcc_register_pll("vco_in",
+	clks[PLL_I2S] = stm32f4_rcc_register_pll("vco_in",
 			&data->pll_data[1], &stm32f4_clk_lock);
 
-	clks[PLL_VCO_SAI] = stm32f4_rcc_register_pll("vco_in",
+	clks[PLL_SAI] = stm32f4_rcc_register_pll("vco_in",
 			&data->pll_data[2], &stm32f4_clk_lock);
 
 	for (n = 0; n < MAX_POST_DIV; n++) {
-- 
2.7.4