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Sun, 25 Apr 2021 22:20:24 -0700 (PDT) MIME-Version: 1.0 References: <20210409045314.3420733-1-hsinyi@chromium.org> In-Reply-To: From: Hsin-Yi Wang Date: Mon, 26 Apr 2021 13:19:59 +0800 Message-ID: Subject: Re: [PATCH 1/2] drm/mediatek: set panel orientation before drm_dev_register(). To: Sean Paul Cc: Chun-Kuang Hu , Matthias Brugger , Enric Balletbo i Serra , Philipp Zabel , David Airlie , Daniel Vetter , dri-devel , "moderated list:ARM/Mediatek SoC support" , linux-arm-kernel , LKML , Rob Herring , devicetree X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210425_222026_025582_93D0C037 X-CRM114-Status: GOOD ( 31.47 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Fri, Apr 23, 2021 at 9:53 PM Sean Paul wrote: > > On Fri, Apr 9, 2021 at 12:53 AM Hsin-Yi Wang wrote: > > > > drm_dev_register() sets connector->registration_state to > > DRM_CONNECTOR_REGISTERED and dev->registered to true. If > > drm_connector_set_panel_orientation() is first called after > > drm_dev_register(), it will fail several checks and results in following > > warning. So set panel orientation in dsi before drm_dev_register() is > > called. > > > > [ 4.480976] ------------[ cut here ]------------ > > [ 4.485603] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:45 __drm_mode_object_add+0xb4/0xbc > > > > [ 4.609772] Call trace: > > [ 4.612208] __drm_mode_object_add+0xb4/0xbc > > [ 4.616466] drm_mode_object_add+0x20/0x2c > > [ 4.620552] drm_property_create+0xdc/0x174 > > [ 4.624723] drm_property_create_enum+0x34/0x98 > > [ 4.629241] drm_connector_set_panel_orientation+0x64/0xa0 > > [ 4.634716] boe_panel_get_modes+0x88/0xd8 > > [ 4.638802] drm_panel_get_modes+0x2c/0x48 > > [ 4.642887] panel_bridge_get_modes+0x1c/0x28 > > [ 4.647233] drm_bridge_connector_get_modes+0xa0/0xd4 > > [ 4.652273] drm_helper_probe_single_connector_modes+0x218/0x700 > > [ 4.658266] drm_mode_getconnector+0x1b4/0x45c > > [ 4.662699] drm_ioctl_kernel+0xac/0x128 > > [ 4.666611] drm_ioctl+0x268/0x410 > > [ 4.670002] drm_compat_ioctl+0xdc/0xf0 > > [ 4.673829] __arm64_compat_sys_ioctl+0xc8/0x100 > > [ 4.678436] el0_svc_common+0xf4/0x1c0 > > [ 4.682174] do_el0_svc_compat+0x28/0x3c > > [ 4.686088] el0_svc_compat+0x10/0x1c > > [ 4.689738] el0_sync_compat_handler+0xa8/0xcc > > [ 4.694171] el0_sync_compat+0x178/0x180 > > [ 4.698082] ---[ end trace b4f2db9d9c88610b ]--- > > [ 4.702721] ------------[ cut here ]------------ > > [ 4.707329] WARNING: CPU: 5 PID: 369 at drivers/gpu/drm/drm_mode_object.c:243 drm_object_attach_property+0x48/0xb8 > > > > [ 4.833830] Call trace: > > [ 4.836266] drm_object_attach_property+0x48/0xb8 > > [ 4.840958] drm_connector_set_panel_orientation+0x84/0xa0 > > [ 4.846432] boe_panel_get_modes+0x88/0xd8 > > [ 4.850516] drm_panel_get_modes+0x2c/0x48 > > [ 4.854600] panel_bridge_get_modes+0x1c/0x28 > > [ 4.858946] drm_bridge_connector_get_modes+0xa0/0xd4 > > [ 4.863984] drm_helper_probe_single_connector_modes+0x218/0x700 > > [ 4.869978] drm_mode_getconnector+0x1b4/0x45c > > [ 4.874410] drm_ioctl_kernel+0xac/0x128 > > [ 4.878320] drm_ioctl+0x268/0x410 > > [ 4.881711] drm_compat_ioctl+0xdc/0xf0 > > [ 4.885536] __arm64_compat_sys_ioctl+0xc8/0x100 > > [ 4.890142] el0_svc_common+0xf4/0x1c0 > > [ 4.893879] do_el0_svc_compat+0x28/0x3c > > [ 4.897791] el0_svc_compat+0x10/0x1c > > [ 4.901441] el0_sync_compat_handler+0xa8/0xcc > > [ 4.905873] el0_sync_compat+0x178/0x180 > > [ 4.909783] ---[ end trace b4f2db9d9c88610c ]--- > > > > Signed-off-by: Hsin-Yi Wang > > --- > > drivers/gpu/drm/mediatek/mtk_dsi.c | 9 +++++++++ > > 1 file changed, 9 insertions(+) > > > > diff --git a/drivers/gpu/drm/mediatek/mtk_dsi.c b/drivers/gpu/drm/mediatek/mtk_dsi.c > > index ae403c67cbd9..45a702ee09f3 100644 > > --- a/drivers/gpu/drm/mediatek/mtk_dsi.c > > +++ b/drivers/gpu/drm/mediatek/mtk_dsi.c > > @@ -205,6 +205,7 @@ struct mtk_dsi { > > u32 irq_data; > > wait_queue_head_t irq_wait_queue; > > const struct mtk_dsi_driver_data *driver_data; > > + enum drm_panel_orientation orientation; > > }; > > > > static inline struct mtk_dsi *bridge_to_dsi(struct drm_bridge *b) > > @@ -966,6 +967,8 @@ static int mtk_dsi_encoder_init(struct drm_device *drm, struct mtk_dsi *dsi) > > } > > drm_connector_attach_encoder(dsi->connector, &dsi->encoder); > > > > + drm_connector_set_panel_orientation(dsi->connector, dsi->orientation); > > + > > return 0; > > > > err_cleanup_encoder: > > @@ -1029,6 +1032,12 @@ static int mtk_dsi_probe(struct platform_device *pdev) > > ret = PTR_ERR(dsi->next_bridge); > > goto err_unregister_host; > > } > > + > > + ret = of_drm_get_panel_orientation(panel->dev->of_node, &dsi->orientation); > > + if (ret) { > > + dev_err(dev, "failed to get panel orientation %d\n", ret); > > + return ret; > > + } > > I don't think this is the right place to mine orientation since it > duplicates the call from the panel driver. > > Instead, how about splitting out > property_create_enum/attach_orientation_property from > set_panel_orientation such that you can attach the property (with > UNKNOWN value) in the connector init and then leave the panel to set > it properly in get_modes (I kind of disagree with populating this in > get_modes as well, but I don't think there's anywhere else to stick it > right now)? > > AFAICT orientation is the only property which has the create/attach > calls in the set function which seems like a perfect recipe for this > type of failure. > > > Sean > Thanks for the review. It is updated in v2. > > } > > > > dsi->driver_data = of_device_get_match_data(dev); > > -- > > 2.31.1.295.g9ea45b61b8-goog > > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel