From: dillon.minfei@gmail.com
To: robh+dt@kernel.org, p.zabel@pengutronix.de,
mcoquelin.stm32@gmail.com, broonie@kernel.org,
devicetree@vger.kernel.org, alexandre.torgue@st.com,
thierry.reding@gmail.com, sam@ravnborg.org, airlied@linux.ie,
daniel@ffwll.ch, mturquette@baylibre.com, sboyd@kernel.org
Cc: linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org,
linux-stm32@st-md-mailman.stormreply.com,
dri-devel@lists.freedesktop.org, linux-clk@vger.kernel.org,
dillon min <dillon.minfei@gmail.com>
Subject: [PATCH v4 7/8] clk: stm32: Fix stm32f429's ltdc driver hang in set clock rate.
Date: Mon, 18 May 2020 19:09:24 +0800 [thread overview]
Message-ID: <1589800165-3271-8-git-send-email-dillon.minfei@gmail.com> (raw)
In-Reply-To: <1589800165-3271-1-git-send-email-dillon.minfei@gmail.com>
From: dillon min <dillon.minfei@gmail.com>
fix duplicated ltdc clock register to 'clk_core' case ltdc's clock
turn off by clk_disable_unused()
ltdc set clock rate crashed:
'post_div_data[]''s pll_num is PLL_I2S, PLL_SAI (number is 1,2). but,
as pll_num is offset of 'clks[]' input to clk_register_pll_div(), which
is FCLK, CLK_LSI, defined in 'include/dt-bindings/clock/stm32fx-clock.h'
so, this is a null object at the register time.
then, in ltdc's clock is_enabled(), enable(), will call to_clk_gate().
will return a null object, cause kernel crashed.
need change pll_num to PLL_VCO_I2S, PLL_VCO_SAI for 'post_div_data[]'
duplicated ltdc clock
'stm32f429_gates[]' has a member 'ltdc' register to 'clk_core', but no
upper driver use it, ltdc driver use the lcd-tft defined in
'stm32f429_aux_clk[]'. after system startup, as stm32f429_gates[]'s ltdc
enable_count is zero, so turn off by clk_disable_unused()
Signed-off-by: dillon min <dillon.minfei@gmail.com>
---
Hi Stephen Boyd:
thanks for reviewing, this patch fix the wrong use of clk ignore unused.
thanks.
Changes since V3:
1 drop last wrong changes about 'CLK_IGNORE_UNUSED' patch
2 fix PLL_SAI mismatch with PLL_VCO_SAI
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 18117ce..fa62e99 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 = {
@@ -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
next prev parent reply other threads:[~2020-05-18 11:10 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-05-18 11:09 [PATCH v4 0/8] Enable ili9341 and l3gd20 on stm32f429-disco dillon.minfei
2020-05-18 11:09 ` [PATCH v4 1/8] ARM: dts: stm32: Add dma config for spi5 dillon.minfei
2020-05-18 11:09 ` [PATCH v4 2/8] ARM: dts: stm32: enable l3gd20 on stm32429-disco board dillon.minfei
2020-05-18 11:09 ` [PATCH v4 3/8] spi: stm32: Add 'SPI_SIMPLEX_RX', 'SPI_3WIRE_RX' support for stm32f4 dillon.minfei
2020-05-22 11:36 ` Mark Brown
2020-05-22 14:57 ` dillon min
2020-05-22 15:59 ` dillon min
2020-05-22 16:29 ` Mark Brown
2020-05-23 1:35 ` dillon min
2020-05-25 11:43 ` Mark Brown
2020-05-18 11:09 ` [PATCH v4 4/8] ARM: dts: stm32: Add pin map for ltdc on stm32f429-disco board dillon.minfei
2020-05-18 11:09 ` [PATCH v4 5/8] dt-bindings: display: panel: Add ilitek ili9341 panel bindings dillon.minfei
2020-05-28 20:49 ` Rob Herring
2020-05-18 11:09 ` [PATCH v4 6/8] ARM: dts: stm32: enable ltdc binding with ili9341 on stm32429-disco board dillon.minfei
2020-05-18 11:09 ` dillon.minfei [this message]
2020-05-18 11:09 ` [PATCH v4 8/8] drm/panel: Add ilitek ili9341 panel driver dillon.minfei
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