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Sun, 19 May 2019 17:36:29 +0800 Message-ID: <1558258588.367.5.camel@mszsdaap41> Subject: Re: [v2 1/5] drm/mediatek: move mipi_dsi_host_register to probe From: Jitao Shi To: CK Hu Date: Sun, 19 May 2019 17:36:28 +0800 In-Reply-To: <1557222735.3498.11.camel@mtksdaap41> References: <20190416060501.76276-1-jitao.shi@mediatek.com> <20190416060501.76276-2-jitao.shi@mediatek.com> <1557222735.3498.11.camel@mtksdaap41> X-Mailer: Evolution 3.10.4-0ubuntu2 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190519_023651_496818_3D1C2363 X-CRM114-Status: GOOD ( 19.49 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, David Airlie , stonea168@163.com, dri-devel@lists.freedesktop.org, yingjoe.chen@mediatek.com, Ajay Kumar , Vincent Palatin , cawa.cheng@mediatek.com, bibby.hsieh@mediatek.com, Russell King , Thierry Reding , linux-pwm@vger.kernel.org, Sascha Hauer , Pawel Moll , Ian Campbell , Inki Dae , Rob Herring , linux-mediatek@lists.infradead.org, Andy Yan , Matthias Brugger , eddie.huang@mediatek.com, linux-arm-kernel@lists.infradead.org, Rahul Sharma , srv_heupstream@mediatek.com, linux-kernel@vger.kernel.org, Philipp Zabel , Kumar Gala , Sean Paul 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 On Tue, 2019-05-07 at 17:52 +0800, CK Hu wrote: > Hi, Jitao: > > On Tue, 2019-04-16 at 14:04 +0800, Jitao Shi wrote: > > DSI panel driver need attach function which is inculde in > > mipi_dsi_host_ops. > > > > If mipi_dsi_host_register is not in probe, dsi panel will > > probe fail or more delay. > > I think this patch just prevent delay, not to prevent dsi panel probe > fail. In [1], you mention mipi_dsi_attach() is called in > panel_simple_dsi_probe(), but panel_simple_dsi_probe() is trigger by > mipi_dsi_host_register(), so the probe would success. > > [1] > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/drivers/gpu/drm/panel/panel-simple.c?h=v5.0-rc6#n2987 > > Yes, this just prevent delay. > > > > So move the mipi_dsi_host_register to probe from bind. > > > > Signed-off-by: Jitao Shi > > --- > > drivers/gpu/drm/mediatek/mtk_dsi.c | 50 ++++++++++++++++++------------ > > 1 file changed, 30 insertions(+), 20 deletions(-) > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c > > index b00eb2d2e086..6c4ac37f983d 100644 > > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c > > @@ -1045,12 +1045,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data) > > return ret; > > } > > > > - ret = mipi_dsi_host_register(&dsi->host); > > - if (ret < 0) { > > - dev_err(dev, "failed to register DSI host: %d\n", ret); > > - goto err_ddp_comp_unregister; > > - } > > - > > ret = mtk_dsi_create_conn_enc(drm, dsi); > > if (ret) { > > DRM_ERROR("Encoder create failed with %d\n", ret); > > @@ -1060,8 +1054,6 @@ static int mtk_dsi_bind(struct device *dev, struct device *master, void *data) > > return 0; > > > > err_unregister: > > - mipi_dsi_host_unregister(&dsi->host); > > -err_ddp_comp_unregister: > > mtk_ddp_comp_unregister(drm, &dsi->ddp_comp); > > return ret; > > } > > @@ -1097,31 +1089,37 @@ static int mtk_dsi_probe(struct platform_device *pdev) > > > > dsi->host.ops = &mtk_dsi_ops; > > dsi->host.dev = dev; > > + dsi->dev = dev; > > Why do this? > > Regards, > CK > There are some error message require this poweron(). > > + ret = mipi_dsi_host_register(&dsi->host); > > + if (ret < 0) { > > + dev_err(dev, "failed to register DSI host: %d\n", ret); > > + return ret; > > + } > > > > ret = drm_of_find_panel_or_bridge(dev->of_node, 0, 0, > > &dsi->panel, &dsi->bridge); > > if (ret) > > - return ret; > > + goto err_unregister_host; > > > > 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); > > - return ret; > > + goto err_unregister_host; > > } > > > > 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); > > - return ret; > > + goto err_unregister_host; > > } > > > > dsi->hs_clk = devm_clk_get(dev, "hs"); > > if (IS_ERR(dsi->hs_clk)) { > > ret = PTR_ERR(dsi->hs_clk); > > dev_err(dev, "Failed to get hs clock: %d\n", ret); > > - return ret; > > + goto err_unregister_host; > > } > > > > regs = platform_get_resource(pdev, IORESOURCE_MEM, 0); > > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel