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Fri, 12 Jan 2024 18:07:51 +0000 Received: from VE1PR04MB6382.eurprd04.prod.outlook.com ([fe80::d4b1:cea8:7085:ec50]) by VE1PR04MB6382.eurprd04.prod.outlook.com ([fe80::d4b1:cea8:7085:ec50%4]) with mapi id 15.20.7181.015; Fri, 12 Jan 2024 18:07:51 +0000 From: Farouk Bouabid To: victor.liu@nxp.com, andrzej.hajda@intel.com, neil.armstrong@linaro.org, rfoss@kernel.org, jonas@kwiboo.se, jernej.skrabec@gmail.com, maarten.lankhorst@linux.intel.com, mripard@kernel.org, tzimmermann@suse.de, airlied@gmail.com, daniel@ffwll.ch, shawnguo@kernel.org, s.hauer@pengutronix.de, kernel@pengutronix.de, festevam@gmail.com, linux-imx@nxp.com, khilman@baylibre.com, jbrunet@baylibre.com, martin.blumenstingl@googlemail.com, hjc@rock-chips.com, heiko@sntech.de, yannick.fertre@foss.st.com, raphael.gallais-pou@foss.st.com, philippe.cornu@foss.st.com, mcoquelin.stm32@gmail.com, alexandre.torgue@foss.st.com, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, linux-amlogic@lists.infradead.org, linux-rockchip@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com Cc: quentin.schulz@theobroma-systems.com, bouabid.farouk97@gmail.com, Farouk Bouabid Subject: [PATCH] drm/bridge: synopsys: dw-mipi-dsi: fix deferred dsi host probe breaks dsi device probe Date: Fri, 12 Jan 2024 19:07:37 +0100 Message-Id: <20240112180737.551318-1-farouk.bouabid@theobroma-systems.com> X-Mailer: git-send-email 2.34.1 X-ClientProxiedBy: VI1PR07CA0144.eurprd07.prod.outlook.com (2603:10a6:802:16::31) To VE1PR04MB6382.eurprd04.prod.outlook.com (2603:10a6:803:122::31) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: VE1PR04MB6382:EE_|DU0PR04MB9467:EE_ X-MS-Office365-Filtering-Correlation-Id: 15ae7662-3396-40bf-093f-08dc1399643f X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; 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This structure is only initialized once dw_mipi_dsi_probe() returns, creating the link between the locally created structure and the actual dmd pointer. Probing the dsi host can be deferred in case of dependency to a dsi phy-supply (eg. "rockchip,px30-dsi-dphy"). Meanwhile dsi-device drivers like panels (eg. "ltk050h3146w") can already be registered on the bus. In that case, when attempting, to register the dsi host from dw_mipi_dsi_probe() using mipi_dsi_host_register(), the panel probe is called with a dsi-host pointer that is still locally allocated in dw_mipi_dsi_probe(). While probing, the panel driver tries to attach to a dsi host (mipi_dsi_attach()) which calls in return for the specific dsi host attach hook. (e.g. dw_mipi_dsi_rockchip_host_attach()). dw_mipi_dsi_rockchip uses the component framework. In the attach hook, the host component is registered which calls in return for drm_bridge_attach() while trying to bind the component (dw_mipi_dsi_bind()) drm_bridge_attach() requires a valid drm bridge parameter. However, the drm bridge (&dmd->bridge) that will be passed, is not yet initialized since the dw_mipi_dsi_probe() has not yet returned. This call will fail with a fatal error (invalid bridge) causing the panel to not be probed again. To simplify the issue: drm_bridge_attach() depends on the result pointer of dw_mipi_dsi_probe(). While, if the dsi probe is deferred, drm_bridge_attach() is called before dw_mipi_dsi_probe() returns. drm_bridge_attach+0x14/0x1ac dw_mipi_dsi_bind+0x24/0x30 dw_mipi_dsi_rockchip_bind+0x258/0x378 component_bind_all+0x118/0x248 rockchip_drm_bind+0xb0/0x1f8 try_to_bring_up_aggregate_device+0x168/0x1d4 __component_add+0xa4/0x170 component_add+0x14/0x20 dw_mipi_dsi_rockchip_host_attach+0x54/0x144 dw_mipi_dsi_host_attach+0x9c/0xcc mipi_dsi_attach+0x28/0x3c ltk050h3146w_probe+0x10c/0x1a4 mipi_dsi_drv_probe+0x20/0x2c really_probe+0x148/0x2ac __driver_probe_device+0x78/0x12c driver_probe_device+0xdc/0x160 __device_attach_driver+0xb8/0x134 bus_for_each_drv+0x80/0xdc __device_attach+0xa8/0x1b0 device_initial_probe+0x14/0x20 bus_probe_device+0xa8/0xac device_add+0x5cc/0x778 mipi_dsi_device_register_full+0xd8/0x198 mipi_dsi_host_register+0x98/0x18c __dw_mipi_dsi_probe+0x290/0x35c dw_mipi_dsi_probe+0x10/0x6c dw_mipi_dsi_rockchip_probe+0x208/0x3e4 platform_probe+0x68/0xdc really_probe+0x148/0x2ac __driver_probe_device+0x78/0x12c driver_probe_device+0xdc/0x160 __device_attach_driver+0xb8/0x134 bus_for_each_drv+0x80/0xdc __device_attach+0xa8/0x1b0 device_initial_probe+0x14/0x20 bus_probe_device+0xa8/0xac deferred_probe_work_func+0x88/0xc0 process_one_work+0x138/0x260 worker_thread+0x32c/0x438 kthread+0x118/0x11c ret_from_fork+0x10/0x20 ---[ end trace 0000000000000000 ]--- Fix this by initializing directly the dmd pointer in dw_mipi_dsi_probe(), which requires also initializting the dmd->bridge attributes that are required in drm_bridge_attach() before calling mipi_dsi_host_register(). Signed-off-by: Farouk Bouabid --- drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c | 4 +- drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 42 ++++++++++--------- drivers/gpu/drm/meson/meson_dw_mipi_dsi.c | 8 ++-- .../gpu/drm/rockchip/dw-mipi-dsi-rockchip.c | 5 +-- drivers/gpu/drm/stm/dw_mipi_dsi-stm.c | 5 +-- include/drm/bridge/dw_mipi_dsi.h | 5 ++- 6 files changed, 35 insertions(+), 34 deletions(-) diff --git a/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c b/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c index 3ff30ce80c5b..469976ad3b19 100644 --- a/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c +++ b/drivers/gpu/drm/bridge/imx/imx93-mipi-dsi.c @@ -881,8 +881,8 @@ static int imx93_dsi_probe(struct platform_device *pdev) dsi->pdata.priv_data = dsi; platform_set_drvdata(pdev, dsi); - dsi->dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata); - if (IS_ERR(dsi->dmd)) + ret = dw_mipi_dsi_probe(pdev, &dsi->pdata, &dsi->dmd); + if (ret < 0) return dev_err_probe(dev, PTR_ERR(dsi->dmd), "failed to probe dw_mipi_dsi\n"); diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c index 824fb3c65742..306cba366ba8 100644 --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c @@ -1184,18 +1184,19 @@ static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi) { } #endif /* CONFIG_DEBUG_FS */ -static struct dw_mipi_dsi * -__dw_mipi_dsi_probe(struct platform_device *pdev, - const struct dw_mipi_dsi_plat_data *plat_data) +int __dw_mipi_dsi_probe(struct platform_device *pdev, + const struct dw_mipi_dsi_plat_data *plat_data, struct dw_mipi_dsi **dsi_p) { struct device *dev = &pdev->dev; struct reset_control *apb_rst; struct dw_mipi_dsi *dsi; int ret; - dsi = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL); - if (!dsi) - return ERR_PTR(-ENOMEM); + *dsi_p = devm_kzalloc(dev, sizeof(*dsi), GFP_KERNEL); + if (!*dsi_p) + return -ENOMEM; + + dsi = *dsi_p; dsi->dev = dev; dsi->plat_data = plat_data; @@ -1203,13 +1204,13 @@ __dw_mipi_dsi_probe(struct platform_device *pdev, if (!plat_data->phy_ops->init || !plat_data->phy_ops->get_lane_mbps || !plat_data->phy_ops->get_timing) { DRM_ERROR("Phy not properly configured\n"); - return ERR_PTR(-ENODEV); + return -ENODEV; } if (!plat_data->base) { dsi->base = devm_platform_ioremap_resource(pdev, 0); if (IS_ERR(dsi->base)) - return ERR_PTR(-ENODEV); + return -ENODEV; } else { dsi->base = plat_data->base; @@ -1219,7 +1220,7 @@ __dw_mipi_dsi_probe(struct platform_device *pdev, if (IS_ERR(dsi->pclk)) { ret = PTR_ERR(dsi->pclk); dev_err(dev, "Unable to get pclk: %d\n", ret); - return ERR_PTR(ret); + return ret; } /* @@ -1233,14 +1234,14 @@ __dw_mipi_dsi_probe(struct platform_device *pdev, if (ret != -EPROBE_DEFER) dev_err(dev, "Unable to get reset control: %d\n", ret); - return ERR_PTR(ret); + return ret; } if (apb_rst) { ret = clk_prepare_enable(dsi->pclk); if (ret) { dev_err(dev, "%s: Failed to enable pclk\n", __func__); - return ERR_PTR(ret); + return ret; } reset_control_assert(apb_rst); @@ -1255,19 +1256,20 @@ __dw_mipi_dsi_probe(struct platform_device *pdev, dsi->dsi_host.ops = &dw_mipi_dsi_host_ops; dsi->dsi_host.dev = dev; + dsi->bridge.driver_private = dsi; + dsi->bridge.funcs = &dw_mipi_dsi_bridge_funcs; + dsi->bridge.of_node = pdev->dev.of_node; + ret = mipi_dsi_host_register(&dsi->dsi_host); if (ret) { dev_err(dev, "Failed to register MIPI host: %d\n", ret); pm_runtime_disable(dev); dw_mipi_dsi_debugfs_remove(dsi); - return ERR_PTR(ret); + return ret; } - dsi->bridge.driver_private = dsi; - dsi->bridge.funcs = &dw_mipi_dsi_bridge_funcs; - dsi->bridge.of_node = pdev->dev.of_node; - return dsi; + return 0; } static void __dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi) @@ -1301,11 +1303,11 @@ EXPORT_SYMBOL_GPL(dw_mipi_dsi_get_bridge); /* * Probe/remove API, used from platforms based on the DRM bridge API. */ -struct dw_mipi_dsi * -dw_mipi_dsi_probe(struct platform_device *pdev, - const struct dw_mipi_dsi_plat_data *plat_data) +int dw_mipi_dsi_probe(struct platform_device *pdev, + const struct dw_mipi_dsi_plat_data *plat_data, + struct dw_mipi_dsi **dsi_p) { - return __dw_mipi_dsi_probe(pdev, plat_data); + return __dw_mipi_dsi_probe(pdev, plat_data, dsi_p); } EXPORT_SYMBOL_GPL(dw_mipi_dsi_probe); diff --git a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c index e5fe4e994f43..b103f3e31f2a 100644 --- a/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c +++ b/drivers/gpu/drm/meson/meson_dw_mipi_dsi.c @@ -262,6 +262,7 @@ static int meson_dw_mipi_dsi_probe(struct platform_device *pdev) { struct meson_dw_mipi_dsi *mipi_dsi; struct device *dev = &pdev->dev; + int ret; mipi_dsi = devm_kzalloc(dev, sizeof(*mipi_dsi), GFP_KERNEL); if (!mipi_dsi) @@ -315,10 +316,9 @@ static int meson_dw_mipi_dsi_probe(struct platform_device *pdev) mipi_dsi->pdata.priv_data = mipi_dsi; platform_set_drvdata(pdev, mipi_dsi); - mipi_dsi->dmd = dw_mipi_dsi_probe(pdev, &mipi_dsi->pdata); - if (IS_ERR(mipi_dsi->dmd)) - return dev_err_probe(dev, PTR_ERR(mipi_dsi->dmd), - "Failed to probe dw_mipi_dsi\n"); + ret = dw_mipi_dsi_probe(pdev, &mipi_dsi->pdata, &mipi_dsi->dmd); + if (ret < 0) + return dev_err_probe(dev, ret, "Failed to probe dw_mipi_dsi\n"); return 0; } diff --git a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c index 6396f9324dab..4df32747476c 100644 --- a/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c +++ b/drivers/gpu/drm/rockchip/dw-mipi-dsi-rockchip.c @@ -1457,9 +1457,8 @@ static int dw_mipi_dsi_rockchip_probe(struct platform_device *pdev) if (IS_ERR(phy_provider)) return PTR_ERR(phy_provider); - dsi->dmd = dw_mipi_dsi_probe(pdev, &dsi->pdata); - if (IS_ERR(dsi->dmd)) { - ret = PTR_ERR(dsi->dmd); + ret = dw_mipi_dsi_probe(pdev, &dsi->pdata, &dsi->dmd); + if (ret < 0) { if (ret != -EPROBE_DEFER) DRM_DEV_ERROR(dev, "Failed to probe dw_mipi_dsi: %d\n", ret); diff --git a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c index d5f8c923d7bc..44dbbfc277d8 100644 --- a/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c +++ b/drivers/gpu/drm/stm/dw_mipi_dsi-stm.c @@ -518,9 +518,8 @@ static int dw_mipi_dsi_stm_probe(struct platform_device *pdev) platform_set_drvdata(pdev, dsi); - dsi->dsi = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data); - if (IS_ERR(dsi->dsi)) { - ret = PTR_ERR(dsi->dsi); + ret = dw_mipi_dsi_probe(pdev, &dw_mipi_dsi_stm_plat_data, &dsi->dsi); + if (ret < 0) { dev_err_probe(dev, ret, "Failed to initialize mipi dsi host\n"); goto err_dsi_probe; } diff --git a/include/drm/bridge/dw_mipi_dsi.h b/include/drm/bridge/dw_mipi_dsi.h index 65d5e68065e3..f073e819251e 100644 --- a/include/drm/bridge/dw_mipi_dsi.h +++ b/include/drm/bridge/dw_mipi_dsi.h @@ -76,9 +76,10 @@ struct dw_mipi_dsi_plat_data { void *priv_data; }; -struct dw_mipi_dsi *dw_mipi_dsi_probe(struct platform_device *pdev, +int dw_mipi_dsi_probe(struct platform_device *pdev, const struct dw_mipi_dsi_plat_data - *plat_data); + *plat_data, + struct dw_mipi_dsi **dsi_p); void dw_mipi_dsi_remove(struct dw_mipi_dsi *dsi); int dw_mipi_dsi_bind(struct dw_mipi_dsi *dsi, struct drm_encoder *encoder); void dw_mipi_dsi_unbind(struct dw_mipi_dsi *dsi);