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Date: Mon, 18 May 2020 19:09:24 +0800 Message-Id: <1589800165-3271-8-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1589800165-3271-1-git-send-email-dillon.minfei@gmail.com> References: <1589800165-3271-1-git-send-email-dillon.minfei@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200518_041012_086631_762D9FE7 X-CRM114-Status: GOOD ( 12.32 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: linux-kernel@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-stm32@st-md-mailman.stormreply.com, linux-spi@vger.kernel.org, dillon min , linux-clk@vger.kernel.org, linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org From: dillon min 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 --- 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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel