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From:   dillon.minfei@gmail.com
To:     robh+dt@kernel.org, mcoquelin.stm32@gmail.com,
        alexandre.torgue@st.com, thierry.reding@gmail.com,
        sam@ravnborg.org, airlied@linux.ie, daniel@ffwll.ch,
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        dillon.minfei@gmail.com
Subject: [PATCH v3 4/5] clk: stm32: Fix stm32f429 ltdc driver loading hang in clk set rate. keep ltdc clk running after kernel startup
Date:   Tue, 12 May 2020 15:03:36 +0800
Message-Id: <1589267017-17294-5-git-send-email-dillon.minfei@gmail.com>
In-Reply-To: <1589267017-17294-1-git-send-email-dillon.minfei@gmail.com>
References: <1589267017-17294-1-git-send-email-dillon.minfei@gmail.com>
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From: dillon min <dillon.minfei@gmail.com>

as store stm32f4_rcc_register_pll return to the wrong offset of clks,
so ltdc gate clk is null. need change clks[PLL_VCO_SAI] to clks[PLL_SAI]

add CLK_IGNORE_UNUSED for ltdc to make sure clk not be freed by
clk_disable_unused

Signed-off-by: dillon min <dillon.minfei@gmail.com>
---
 drivers/clk/clk-stm32f4.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/drivers/clk/clk-stm32f4.c b/drivers/clk/clk-stm32f4.c
index 18117ce..0ba73de 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 = {
@@ -1757,7 +1758,7 @@ static void __init stm32f4_rcc_init(struct device_node *np)
 	clks[PLL_VCO_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