linux-kernel - Re: [PATCH] drm/msm: Set preferred depth.

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Message-ID: <Y7fkIvBRHcsgHR0l@phenom.ffwll.local>
Date:   Fri, 6 Jan 2023 10:04:34 +0100
From:   Daniel Vetter <daniel@...ll.ch>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Cc:     Steev Klimaszewski <steev@...i.org>,
        Rob Clark <robdclark@...il.com>,
        Abhinav Kumar <quic_abhinavk@...cinc.com>,
        Sean Paul <sean@...rly.run>, David Airlie <airlied@...il.com>,
        Daniel Vetter <daniel@...ll.ch>, linux-arm-msm@...r.kernel.org,
        dri-devel@...ts.freedesktop.org, freedreno@...ts.freedesktop.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] drm/msm: Set preferred depth.

On Fri, Jan 06, 2023 at 09:18:21AM +0200, Dmitry Baryshkov wrote:
> On 06/01/2023 09:16, Steev Klimaszewski wrote:
> > As of commit 37c90d589dc0 ("drm/fb-helper: Fix single-probe color-format
> > selection"), if no supported color formats are found, it tries to use the
> > driver provided default, which msm didn't have set and leads to the
> > following output:
> > 
> > msm_dpu ae01000.display-controller: [drm] bpp/depth value of 32/0 not supported
> > msm_dpu ae01000.display-controller: [drm] bpp/depth value of 32/0 not supported
> > msm_dpu ae01000.display-controller: [drm] bpp/depth value of 32/0 not supported
> > msm_dpu ae01000.display-controller: [drm] No compatible format found
> > ------------[ cut here ]------------
> > WARNING: CPU: 0 PID: 73 at drivers/gpu/drm/drm_atomic.c:1604 __drm_atomic_helper_set_config+0x240/0x33c
> > Modules linked in: ext4 mbcache jbd2 msm mdt_loader ocmem gpu_sched llcc_qcom gpio_keys qrtr
> > CPU: 0 PID: 73 Comm: kworker/u16:2 Not tainted 6.2.0-rc2-next-20230106 #53
> > Hardware name: LENOVO 21BX0015US/21BX0015US, BIOS N3HET74W (1.46 ) 10/12/2022
> > Workqueue: events_unbound deferred_probe_work_func
> > pstate: 80400005 (Nzcv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
> > pc : __drm_atomic_helper_set_config+0x240/0x33c
> > lr : __drm_atomic_helper_set_config+0x68/0x33c
> > sp : ffff800008a7b790
> > x29: ffff800008a7b790 x28: ffff73ee3e130a00 x27: 0000000000000000
> > x26: ffff73ee3d256e00 x25: 0000000000000038 x24: ffff73e6c0d65e00
> > x23: ffff73e6c17a7800 x22: ffff73e6c0d64e00 x21: ffff73e79c025e00
> > x20: 00000000c0d64e00 x19: ffff73ee3e130a00 x18: ffffffffffffffff
> > x17: 662074616d726f66 x16: 20656c6269746170 x15: 0000000000000000
> > x14: 0000000000000000 x13: 0000000000000000 x12: 0000000000000000
> > x11: 0000000000000000 x10: 0000000000000000 x9 : ffffa829144ff8bc
> > x8 : 0000000000000000 x7 : 0000000000000000 x6 : 0000000000000000
> > x5 : ffff73e6c0d65f50 x4 : ffff73ee3d254950 x3 : ffff73e6c0d65ec0
> > x2 : ffff73ee3c953a00 x1 : ffff73e79c025580 x0 : 0000000000000000
> > Call trace:
> > __drm_atomic_helper_set_config+0x240/0x33c
> > drm_client_modeset_commit_atomic+0x160/0x280
> > drm_client_modeset_commit_locked+0x64/0x194
> > drm_client_modeset_commit+0x38/0x60
> > __drm_fb_helper_initial_config_and_unlock+0x528/0x63c
> > drm_fb_helper_initial_config+0x54/0x64
> > msm_fbdev_init+0x94/0xfc [msm]
> > msm_drm_bind+0x548/0x614 [msm]
> > try_to_bring_up_aggregate_device+0x1e4/0x2d0
> > __component_add+0xc4/0x1c0
> > component_add+0x1c/0x2c
> > dp_display_probe+0x2a4/0x460 [msm]
> > platform_probe+0x70/0xcc
> > really_probe+0xc8/0x3e0
> > __driver_probe_device+0x84/0x190
> > driver_probe_device+0x44/0x120
> > __device_attach_driver+0xc4/0x160
> > bus_for_each_drv+0x84/0xe0
> > __device_attach+0xa4/0x1cc
> > device_initial_probe+0x1c/0x2c
> > bus_probe_device+0xa4/0xb0
> > deferred_probe_work_func+0xc0/0x114
> > process_one_work+0x1ec/0x470
> > worker_thread+0x74/0x410
> > kthread+0xfc/0x110
> > ret_from_fork+0x10/0x20
> > ---[ end trace 0000000000000000 ]---
> > 
> > Signed-off-by: Steev Klimaszewski <steev@...i.org>
> > ---
> >   drivers/gpu/drm/msm/msm_drv.c | 1 +
> >   1 file changed, 1 insertion(+)
> 
> Suggested-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
> Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>

I think a documentation patch that preferred_depth = 0 actually means
xrgb8888 would be good, since we seem to have a serious confusion going on
here?
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch