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w90mr6688896pjw.36.1581620304545; Thu, 13 Feb 2020 10:58:24 -0800 (PST) Received: from ziggy.stardust ([37.223.145.31]) by smtp.gmail.com with ESMTPSA id b12sm4099080pfr.26.2020.02.13.10.58.18 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 Feb 2020 10:58:23 -0800 (PST) Subject: Re: [resend PATCH v6 04/12] drm: mediatek: Omit warning on probe defers To: Enric Balletbo i Serra , matthias.bgg@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, ck.hu@mediatek.com, p.zabel@pengutronix.de, airlied@linux.ie, mturquette@baylibre.com, sboyd@kernel.org, ulrich.hecht+renesas@gmail.com, laurent.pinchart@ideasonboard.com Cc: sean.wang@mediatek.com, sean.wang@kernel.org, rdunlap@infradead.org, wens@csie.org, hsinyi@chromium.org, frank-w@public-files.de, drinkcat@chromium.org, linux-media@vger.kernel.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, mbrugger@suse.com References: <20191207224740.24536-1-matthias.bgg@kernel.org> <20191207224740.24536-5-matthias.bgg@kernel.org> <48f9ec0c-1f1e-5a6c-283b-7efc4ce1bd5e@collabora.com> From: Matthias Brugger Autocrypt: addr=matthias.bgg@gmail.com; prefer-encrypt=mutual; keydata= mQINBFP1zgUBEAC21D6hk7//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 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x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.4.1 MIME-Version: 1.0 In-Reply-To: <48f9ec0c-1f1e-5a6c-283b-7efc4ce1bd5e@collabora.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org On 09/12/2019 10:39, Enric Balletbo i Serra wrote: > Hi Matthias, > > On 7/12/19 23:47, 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. >> >> Signed-off-by: Matthias Brugger >> --- >> drivers/gpu/drm/mediatek/mtk_disp_color.c | 5 ++++- >> drivers/gpu/drm/mediatek/mtk_disp_ovl.c | 5 ++++- >> drivers/gpu/drm/mediatek/mtk_disp_rdma.c | 5 ++++- >> drivers/gpu/drm/mediatek/mtk_dpi.c | 12 +++++++++--- >> drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 4 +++- >> drivers/gpu/drm/mediatek/mtk_dsi.c | 8 ++++++-- >> drivers/gpu/drm/mediatek/mtk_hdmi.c | 4 +++- >> 7 files changed, 33 insertions(+), 10 deletions(-) >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_color.c b/drivers/gpu/drm/mediatek/mtk_disp_color.c >> index 59de2a46aa49..8f0fc96ef7bc 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_disp_color.c >> +++ b/drivers/gpu/drm/mediatek/mtk_disp_color.c >> @@ -118,7 +118,10 @@ 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); >> + >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c >> index 21851756c579..7487b0182c05 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_disp_ovl.c >> +++ b/drivers/gpu/drm/mediatek/mtk_disp_ovl.c >> @@ -285,7 +285,10 @@ 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); >> + >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c >> index 405afef31407..835ea8f8dab9 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_disp_rdma.c >> +++ b/drivers/gpu/drm/mediatek/mtk_disp_rdma.c >> @@ -287,7 +287,10 @@ 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_dpi.c b/drivers/gpu/drm/mediatek/mtk_dpi.c >> index be6d95c5ff25..9ed32470ad02 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_dpi.c >> +++ b/drivers/gpu/drm/mediatek/mtk_dpi.c >> @@ -700,21 +700,27 @@ static int mtk_dpi_probe(struct platform_device *pdev) >> dpi->engine_clk = devm_clk_get(dev, "engine"); >> if (IS_ERR(dpi->engine_clk)) { >> ret = PTR_ERR(dpi->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); > > This is only to print an error and I think that devm_clk_get will print a > warning if the clk is not found. I guess that you can just remove the dev_err > print logic, here and below. > I didn't follow all the paths, but at least devres_alloc in devm_clk_get isn't able to alloc the memory, it will silently return -ENOMEM. So I think it is OK to print an error message here. Regards, Matthias > In case there is an optional clock you could use devm_clk_get_optional, not sure > if there is any, though. > >> + >> return ret; >> } >> >> dpi->pixel_clk = devm_clk_get(dev, "pixel"); >> if (IS_ERR(dpi->pixel_clk)) { >> ret = PTR_ERR(dpi->pixel_clk); >> - dev_err(dev, "Failed to get pixel clock: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get pixel clock: %d\n", ret); >> + > > ditto > >> return ret; >> } >> >> dpi->tvd_clk = devm_clk_get(dev, "pll"); >> if (IS_ERR(dpi->tvd_clk)) { >> ret = PTR_ERR(dpi->tvd_clk); >> - dev_err(dev, "Failed to get tvdpll clock: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get tvdpll clock: %d\n", ret); >> + > > ditto > >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c >> index b765181223e6..6054e2b675f9 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c >> +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c >> @@ -558,7 +558,9 @@ 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"); >> + > > ditto > >> return PTR_ERR(ddp->clk); >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c >> index 4332563df952..66d5b0fdd678 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_dsi.c >> +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c >> @@ -1110,14 +1110,18 @@ 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); >> + > > ditto > >> 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); >> + > > ditto > >> return ret; >> } >> >> diff --git a/drivers/gpu/drm/mediatek/mtk_hdmi.c b/drivers/gpu/drm/mediatek/mtk_hdmi.c >> index ce91b61364eb..62f9ca2308ee 100644 >> --- a/drivers/gpu/drm/mediatek/mtk_hdmi.c >> +++ b/drivers/gpu/drm/mediatek/mtk_hdmi.c >> @@ -1447,7 +1447,9 @@ static int mtk_hdmi_dt_parse_pdata(struct mtk_hdmi *hdmi, >> >> ret = mtk_hdmi_get_all_clk(hdmi, np); >> if (ret) { >> - dev_err(dev, "Failed to get clocks: %d\n", ret); >> + if (ret != -EPROBE_DEFER) >> + dev_err(dev, "Failed to get clocks: %d\n", ret); >> + >> return ret; >> } >> >>