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Mon, 19 Nov 2018 01:26:56 -0800 (PST) Subject: Re: [PATCH v5 05/12] drm: mediatek: Omit warning on probe defers To: CK Hu , matthias.bgg@kernel.org Cc: robh+dt@kernel.org, mark.rutland@arm.com, p.zabel@pengutronix.de, airlied@linux.ie, mturquette@baylibre.com, sboyd@codeaurora.org, ulrich.hecht+renesas@gmail.com, laurent.pinchart@ideasonboard.com, sean.wang@mediatek.com, sean.wang@kernel.org, rdunlap@infradead.org, wens@csie.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-mediatek@lists.infradead.org, linux-clk@vger.kernel.org, devicetree@vger.kernel.org, Matthias Brugger References: <20181116125449.23581-1-matthias.bgg@kernel.org> <20181116125449.23581-6-matthias.bgg@kernel.org> <1542605939.32082.12.camel@mtksdaap41> From: Matthias Brugger Openpgp: preference=signencrypt Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= xsFNBFP1zgUBEAC21D6hk7//0kOmsUrE3eZ55kjc9DmFPKIz6l4NggqwQjBNRHIMh04BbCMY fL3eT7ZsYV5nur7zctmJ+vbszoOASXUpfq8M+S5hU2w7sBaVk5rpH9yW8CUWz2+ZpQXPJcFa OhLZuSKB1F5JcvLbETRjNzNU7B3TdS2+zkgQQdEyt7Ij2HXGLJ2w+yG2GuR9/iyCJRf10Okq gTh//XESJZ8S6KlOWbLXRE+yfkKDXQx2Jr1XuVvM3zPqH5FMg8reRVFsQ+vI0b+OlyekT/Xe 0Hwvqkev95GG6x7yseJwI+2ydDH6M5O7fPKFW5mzAdDE2g/K9B4e2tYK6/rA7Fq4cqiAw1+u EgO44+eFgv082xtBez5WNkGn18vtw0LW3ESmKh19u6kEGoi0WZwslCNaGFrS4M7OH+aOJeqK fx5dIv2CEbxc6xnHY7dwkcHikTA4QdbdFeUSuj4YhIZ+0QlDVtS1QEXyvZbZky7ur9rHkZvP ZqlUsLJ2nOqsmahMTIQ8Mgx9SLEShWqD4kOF4zNfPJsgEMB49KbS2o9jxbGB+JKupjNddfxZ HlH1KF8QwCMZEYaTNogrVazuEJzx6JdRpR3sFda/0x5qjTadwIW6Cl9tkqe2h391dOGX1eOA 1ntn9O/39KqSrWNGvm+1raHK+Ev1yPtn0Wxn+0oy1tl67TxUjQARAQABzSlNYXR0aGlhcyBC cnVnZ2VyIDxtYXR0aGlhcy5iZ2dAZ21haWwuY29tPsLBkgQTAQIAPAIbAwYLCQgHAwIGFQgC CQoLBBYCAwECHgECF4AWIQTmuZIYwPLDJRwsOhfZFAuyVhMC8QUCWt3scQIZAQAKCRDZFAuy VhMC8WzRD/4onkC+gCxG+dvui5SXCJ7bGLCu0xVtiGC673Kz5Aq3heITsERHBV0BqqctOEBy ZozQQe2Hindu9lasOmwfH8+vfTK+2teCgWesoE3g3XKbrOCB4RSrQmXGC3JYx6rcvMlLV/Ch YMRR3qv04BOchnjkGtvm9aZWH52/6XfChyh7XYndTe5F2bqeTjt+kF/ql+xMc4E6pniqIfkv c0wsH4CkBHqoZl9w5e/b9MspTqsU9NszTEOFhy7p2CYw6JEa/vmzR6YDzGs8AihieIXDOfpT DUr0YUlDrwDSrlm/2MjNIPTmSGHH94ScOqu/XmGW/0q1iar/Yr0leomUOeeEzCqQtunqShtE 4Mn2uEixFL+9jiVtMjujr6mphznwpEqObPCZ3IcWqOFEz77rSL+oqFiEA03A2WBDlMm++Sve 9jpkJBLosJRhAYmQ6ey6MFO6Krylw1LXcq5z1XQQavtFRgZoruHZ3XlhT5wcfLJtAqrtfCe0 aQ0kJW+4zj9/So0uxJDAtGuOpDYnmK26dgFN0tAhVuNInEVhtErtLJHeJzFKJzNyQ4GlCaLw jKcwWcqDJcrx9R7LsCu4l2XpKiyxY6fO4O8DnSleVll9NPfAZFZvf8AIy3EQ8BokUsiuUYHz wUo6pclk55PZRaAsHDX/fNr24uC6Eh5oNQ+v4Pax/gtyyc7BTQRT9gkSARAApxtQ4zUMC512 kZ+gCiySFcIF/mAf7+l45689Tn7LI1xmPQrAYJDoqQVXcyh3utgtvBvDLmpQ+1BfEONDWc8K RP6Abo35YqBx3udAkLZgr/RmEg3+Tiof+e1PJ2zRh5zmdei5MT8biE2zVd9DYSJHZ8ltEWIA LC9lAsv9oa+2L6naC+KFF3i0m5mxklgFoSthswUnonqvclsjYaiVPoSldDrreCPzmRCUd8zn f//Z4BxtlTw3SulF8weKLJ+Hlpw8lwb3sUl6yPS6pL6UV45gyWMe677bVUtxLYOu+kiv2B/+ nrNRDs7B35y/J4t8dtK0S3M/7xtinPiYRmsnJdk+sdAe8TgGkEaooF57k1aczcJlUTBQvlYA Eg2NJnqaKg3SCJ4fEuT8rLjzuZmLkoHNumhH/mEbyKca82HvANu5C9clyQusJdU+MNRQLRmO Ad/wxGLJ0xmAye7Ozja86AIzbEmuNhNH9xNjwbwSJNZefV2SoZUv0+V9EfEVxTzraBNUZifq v6hernMQXGxs+lBjnyl624U8nnQWnA8PwJ2hI3DeQou1HypLFPeY9DfWv4xYdkyeOtGpueeB lqhtMoZ0kDw2C3vzj77nWwBgpgn1Vpf4hG/sW/CRR6tuIQWWTvUM3ACa1pgEsBvIEBiVvPxy AtL+L+Lh1Sni7w3HBk1EJvUAEQEAAcLBXwQYAQIACQUCU/YJEgIbDAAKCRDZFAuyVhMC8Qnd EACuN16mvivnWwLDdypvco5PF8w9yrfZDKW4ggf9TFVB9skzMNCuQc+tc+QM+ni2c4kKIdz2 jmcg6QytgqVum6V1OsNmpjADaQkVp5jL0tmg6/KA9Tvr07Kuv+Uo4tSrS/4djDjJnXHEp/tB +Fw7CArNtUtLlc8SuADCmMD+kBOVWktZyzkBkDfBXlTWl46T/8291lEspDWe5YW1ZAH/HdCR 1rQNZWjNCpB2Cic58CYMD1rSonCnbfUeyZYNNhNHZosl4dl7f+am87Q2x3pK0DLSoJRxWb7v ZB0uo9CzCSm3I++aYozF25xQoT+7zCx2cQi33jwvnJAK1o4VlNx36RfrxzBqc1uZGzJBCQu4 8UjmUSsTwWC3HpE/D9sM+xACs803lFUIZC5H62G059cCPAXKgsFpNMKmBAWweBkVJAisoQeX 50OP+/11ArV0cv+fOTfJj0/KwFXJaaYh3LUQNILLBNxkSrhCLl8dUg53IbHx4NfIAgqxLWGf XM8DY1aFdU79pac005PuhxCWkKTJz3gCmznnoat4GCnL5gy/m0Qk45l4PFqwWXVLo9AQg2Kp 3mlIFZ6fsEKIAN5hxlbNvNb9V2Zo5bFZjPWPFTxOteM0omUAS+QopwU0yPLLGJVf2iCmItHc UXI+r2JwH1CJjrHWeQEI2ucSKsNa8FllDmG/fQ== Message-ID: <0a02edf9-78da-dde9-4b69-38c4719b711b@gmail.com> Date: Mon, 19 Nov 2018 10:26:48 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.2.1 MIME-Version: 1.0 In-Reply-To: <1542605939.32082.12.camel@mtksdaap41> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 19/11/2018 06:38, CK Hu wrote: > Hi, Matthias: > > On Fri, 2018-11-16 at 13:54 +0100, matthias.bgg@kernel.org wrote: >> From: Matthias Brugger >> >> It can happen that the mmsys clock drivers aren't probed before the >> platform driver gets invoked. The platform driver used to print a warning >> that the driver failed to get the clocks. Omit this error on >> the defered probe path. > > This patch looks good to me, but you have not modified the sub driver in > HDMI path. We could let HDMI path print the warning and someone send > another patch later, or you modify for HDMI path in this patch. Sure, I'll add this in v6. After inspecting the code, I think we will need to also check for not initialized clocks in mtk_mdp_comp_init, as the driver for now does not even check if the clocks are present. What do you think? I'll address the coding style issue you metioned below as well. Regards, Matthias >> >> Signed-off-by: Matthias Brugger >> --- >> drivers/gpu/drm/mediatek/mtk_disp_color.c | 4 +++- >> drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 4 +++- >> drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 4 +++- >> drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 3 ++- >> drivers/gpu/drm/mediatek/mtk_dsi.c | 6 ++++-- >> 5 files changed, 15 insertions(+), 6 deletions(-) >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_color.c b/drivers/gpu/drm/mediatek/mtk_disp_color.c >> index f609b62b8be6..1ea3178d4c18 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_disp_color.c >> +++ b/drivers/gpu/drm/mediatek/mtk_disp_color.c >> @@ -126,7 +126,9 @@ static int mtk_disp_color_probe(struct platform_device *pdev) >> ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id, >> &mtk_disp_color_funcs); >> if (ret) { >> - dev_err(dev, "Failed to initialize component: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to initialize component: %d\n", >> + ret); > > I would like one more blank line here. > >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c >> index 28d191192945..5ebbcaa4e70e 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c >> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c >> @@ -293,7 +293,9 @@ static int mtk_disp_ovl_probe(struct platform_device *pdev) >> ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id, >> &mtk_disp_ovl_funcs); >> if (ret) { >> - dev_err(dev, "Failed to initialize component: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to initialize component: %d\n", >> + ret); > > I would like to align to the right of '('. > > Regards, > CK > >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c >> index b0a5cffe345a..59a08ed5fea5 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c >> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c >> @@ -295,7 +295,9 @@ static int mtk_disp_rdma_probe(struct platform_device *pdev) >> ret = mtk_ddp_comp_init(dev, dev->of_node, &priv->ddp_comp, comp_id, >> &mtk_disp_rdma_funcs); >> if (ret) { >> - dev_err(dev, "Failed to initialize component: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to initialize component: %d\n", >> + ret); >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c >> index b06cd9d4b525..b76a2d071a97 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c >> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c >> @@ -566,7 +566,8 @@ static int mtk_ddp_probe(struct platform_device *pdev) >> >> ddp->clk = devm_clk_get(dev, NULL); >> if (IS_ERR(ddp->clk)) { >> - dev_err(dev, "Failed to get clock\n"); >> + if (PTR_ERR(ddp->clk) != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get clock\n"); >> return PTR_ERR(ddp->clk); >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c >> index 90109a0d6fff..cc6de75636c3 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c >> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c >> @@ -1103,14 +1103,16 @@ static int mtk_dsi_probe(struct platform_device *pdev) >> dsi->engine_clk = devm_clk_get(dev, "engine"); >> if (IS_ERR(dsi->engine_clk)) { >> ret = PTR_ERR(dsi->engine_clk); >> - dev_err(dev, "Failed to get engine clock: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get engine clock: %d\n", ret); >> return ret; >> } >> >> dsi->digital_clk = devm_clk_get(dev, "digital"); >> if (IS_ERR(dsi->digital_clk)) { >> ret = PTR_ERR(dsi->digital_clk); >> - dev_err(dev, "Failed to get digital clock: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get digital clock: %d\n", ret); >> return ret; >> } >> > >