| Message ID | 20191006160303.24413-2-icenowy@aosc.io (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | drm/sun4i: dsi: misc fixes | expand |
On Mon, Oct 07, 2019 at 12:03:00AM +0800, Icenowy Zheng wrote: > From: Jagan Teki <jagan@amarulasolutions.com> > > The LCD timing definitions between Linux DRM vs Allwinner are different, > below diagram shows this clear differences. > > Active Front Sync Back > Region Porch Porch > <-----------------------><----------------><--------------><--------------> > //////////////////////| > ////////////////////// | > ////////////////////// |.................. ................ > ________________ > <----- [hv]display -----> > <------------- [hv]sync_start ------------> > <--------------------- [hv]sync_end ----------------------> > <-------------------------------- [hv]total ------------------------------> > > <----- lcd_[xy] --------> <- lcd_[hv]spw -> > <---------- lcd_[hv]bp ---------> > <-------------------------------- lcd_[hv]t ------------------------------> > > The DSI driver misinterpreted the vbp term from the BSP code to refer > only to the backporch, when in fact it was backporch + sync. Thus the > driver incorrectly used the vertical front porch plus sync in its > calculation of the DRQ set bit value, when it should not have included > the sync timing. > > Including additional sync timings leads to flip_done timed out as: > > WARNING: CPU: 0 PID: 31 at drivers/gpu/drm/drm_atomic_helper.c:1429 drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0 > [CRTC:46:crtc-0] vblank wait timed out > Modules linked in: > CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted 5.1.0-next-20190514-00029-g09e5b0ed0a58 #18 > Hardware name: Allwinner sun8i Family > Workqueue: events deferred_probe_work_func > [<c010ed54>] (unwind_backtrace) from [<c010b76c>] (show_stack+0x10/0x14) > [<c010b76c>] (show_stack) from [<c0688c70>] (dump_stack+0x84/0x98) > [<c0688c70>] (dump_stack) from [<c011d9e4>] (__warn+0xfc/0x114) > [<c011d9e4>] (__warn) from [<c011da40>] (warn_slowpath_fmt+0x44/0x68) > [<c011da40>] (warn_slowpath_fmt) from [<c040cd50>] (drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0) > [<c040cd50>] (drm_atomic_helper_wait_for_vblanks.part.1) from [<c040e694>] (drm_atomic_helper_commit_tail_rpm+0x5c/0x6c) > [<c040e694>] (drm_atomic_helper_commit_tail_rpm) from [<c040e4dc>] (commit_tail+0x40/0x6c) > [<c040e4dc>] (commit_tail) from [<c040e5cc>] (drm_atomic_helper_commit+0xbc/0x128) > [<c040e5cc>] (drm_atomic_helper_commit) from [<c0411b64>] (restore_fbdev_mode_atomic+0x1cc/0x1dc) > [<c0411b64>] (restore_fbdev_mode_atomic) from [<c04156f8>] (drm_fb_helper_restore_fbdev_mode_unlocked+0x54/0xa0) > [<c04156f8>] (drm_fb_helper_restore_fbdev_mode_unlocked) from [<c0415774>] (drm_fb_helper_set_par+0x30/0x54) > [<c0415774>] (drm_fb_helper_set_par) from [<c03ad450>] (fbcon_init+0x560/0x5ac) > [<c03ad450>] (fbcon_init) from [<c03eb8a0>] (visual_init+0xbc/0x104) > [<c03eb8a0>] (visual_init) from [<c03ed1b8>] (do_bind_con_driver+0x1b0/0x390) > [<c03ed1b8>] (do_bind_con_driver) from [<c03ed780>] (do_take_over_console+0x13c/0x1c4) > [<c03ed780>] (do_take_over_console) from [<c03ad800>] (do_fbcon_takeover+0x74/0xcc) > [<c03ad800>] (do_fbcon_takeover) from [<c013c9c8>] (notifier_call_chain+0x44/0x84) > [<c013c9c8>] (notifier_call_chain) from [<c013cd20>] (__blocking_notifier_call_chain+0x48/0x60) > [<c013cd20>] (__blocking_notifier_call_chain) from [<c013cd50>] (blocking_notifier_call_chain+0x18/0x20) > [<c013cd50>] (blocking_notifier_call_chain) from [<c03a6e44>] (register_framebuffer+0x1e0/0x2f8) > [<c03a6e44>] (register_framebuffer) from [<c04153c0>] (__drm_fb_helper_initial_config_and_unlock+0x2fc/0x50c) > [<c04153c0>] (__drm_fb_helper_initial_config_and_unlock) from [<c04158c8>] (drm_fbdev_client_hotplug+0xe8/0x1b8) > [<c04158c8>] (drm_fbdev_client_hotplug) from [<c0415a20>] (drm_fbdev_generic_setup+0x88/0x118) > [<c0415a20>] (drm_fbdev_generic_setup) from [<c043f060>] (sun4i_drv_bind+0x128/0x160) > [<c043f060>] (sun4i_drv_bind) from [<c044b598>] (try_to_bring_up_master+0x164/0x1a0) > [<c044b598>] (try_to_bring_up_master) from [<c044b668>] (__component_add+0x94/0x140) > [<c044b668>] (__component_add) from [<c0445e1c>] (sun6i_dsi_probe+0x144/0x234) > [<c0445e1c>] (sun6i_dsi_probe) from [<c0452ef4>] (platform_drv_probe+0x48/0x9c) > [<c0452ef4>] (platform_drv_probe) from [<c04512cc>] (really_probe+0x1dc/0x2c8) > [<c04512cc>] (really_probe) from [<c0451518>] (driver_probe_device+0x60/0x160) > [<c0451518>] (driver_probe_device) from [<c044f7a4>] (bus_for_each_drv+0x74/0xb8) > [<c044f7a4>] (bus_for_each_drv) from [<c045107c>] (__device_attach+0xd0/0x13c) > [<c045107c>] (__device_attach) from [<c0450474>] (bus_probe_device+0x84/0x8c) > [<c0450474>] (bus_probe_device) from [<c0450900>] (deferred_probe_work_func+0x64/0x90) > [<c0450900>] (deferred_probe_work_func) from [<c0135970>] (process_one_work+0x204/0x420) > [<c0135970>] (process_one_work) from [<c013690c>] (worker_thread+0x274/0x5a0) > [<c013690c>] (worker_thread) from [<c013b3d8>] (kthread+0x11c/0x14c) > [<c013b3d8>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c) > Exception stack(0xde539fb0 to 0xde539ff8) > 9fa0: 00000000 00000000 00000000 00000000 > 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > ---[ end trace 495200a78b24980e ]--- > random: fast init done > [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CRTC:46:crtc-0] flip_done timed out > [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [CONNECTOR:48:DSI-1] flip_done timed out > [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* [PLANE:30:plane-0] flip_done timed out > > With the terms(as described in above diagram) fixed, the panel > displays correctly without any timeouts. > > Tested-by: Merlijn Wajer <merlijn@wizzup.org> > Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> you should have your SoB here. All the patches look fine, so there's no need to resend a new version. I'll add it if you can give it. Maxime
于 2019年10月7日 GMT+08:00 下午7:51:48, Maxime Ripard <mripard@kernel.org> 写到: >On Mon, Oct 07, 2019 at 12:03:00AM +0800, Icenowy Zheng wrote: >> From: Jagan Teki <jagan@amarulasolutions.com> >> >> The LCD timing definitions between Linux DRM vs Allwinner are >different, >> below diagram shows this clear differences. >> >> Active Front Sync Back >> Region Porch >Porch >> ><-----------------------><----------------><--------------><--------------> >> //////////////////////| >> ////////////////////// | >> ////////////////////// |.................. >................ >> ________________ >> <----- [hv]display -----> >> <------------- [hv]sync_start ------------> >> <--------------------- [hv]sync_end ----------------------> >> <-------------------------------- [hv]total >------------------------------> >> >> <----- lcd_[xy] --------> <- lcd_[hv]spw -> >> <---------- lcd_[hv]bp ---------> >> <-------------------------------- lcd_[hv]t >------------------------------> >> >> The DSI driver misinterpreted the vbp term from the BSP code to refer >> only to the backporch, when in fact it was backporch + sync. Thus the >> driver incorrectly used the vertical front porch plus sync in its >> calculation of the DRQ set bit value, when it should not have >included >> the sync timing. >> >> Including additional sync timings leads to flip_done timed out as: >> >> WARNING: CPU: 0 PID: 31 at drivers/gpu/drm/drm_atomic_helper.c:1429 >drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0 >> [CRTC:46:crtc-0] vblank wait timed out >> Modules linked in: >> CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted >5.1.0-next-20190514-00029-g09e5b0ed0a58 #18 >> Hardware name: Allwinner sun8i Family >> Workqueue: events deferred_probe_work_func >> [<c010ed54>] (unwind_backtrace) from [<c010b76c>] >(show_stack+0x10/0x14) >> [<c010b76c>] (show_stack) from [<c0688c70>] (dump_stack+0x84/0x98) >> [<c0688c70>] (dump_stack) from [<c011d9e4>] (__warn+0xfc/0x114) >> [<c011d9e4>] (__warn) from [<c011da40>] (warn_slowpath_fmt+0x44/0x68) >> [<c011da40>] (warn_slowpath_fmt) from [<c040cd50>] >(drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0) >> [<c040cd50>] (drm_atomic_helper_wait_for_vblanks.part.1) from >[<c040e694>] (drm_atomic_helper_commit_tail_rpm+0x5c/0x6c) >> [<c040e694>] (drm_atomic_helper_commit_tail_rpm) from [<c040e4dc>] >(commit_tail+0x40/0x6c) >> [<c040e4dc>] (commit_tail) from [<c040e5cc>] >(drm_atomic_helper_commit+0xbc/0x128) >> [<c040e5cc>] (drm_atomic_helper_commit) from [<c0411b64>] >(restore_fbdev_mode_atomic+0x1cc/0x1dc) >> [<c0411b64>] (restore_fbdev_mode_atomic) from [<c04156f8>] >(drm_fb_helper_restore_fbdev_mode_unlocked+0x54/0xa0) >> [<c04156f8>] (drm_fb_helper_restore_fbdev_mode_unlocked) from >[<c0415774>] (drm_fb_helper_set_par+0x30/0x54) >> [<c0415774>] (drm_fb_helper_set_par) from [<c03ad450>] >(fbcon_init+0x560/0x5ac) >> [<c03ad450>] (fbcon_init) from [<c03eb8a0>] (visual_init+0xbc/0x104) >> [<c03eb8a0>] (visual_init) from [<c03ed1b8>] >(do_bind_con_driver+0x1b0/0x390) >> [<c03ed1b8>] (do_bind_con_driver) from [<c03ed780>] >(do_take_over_console+0x13c/0x1c4) >> [<c03ed780>] (do_take_over_console) from [<c03ad800>] >(do_fbcon_takeover+0x74/0xcc) >> [<c03ad800>] (do_fbcon_takeover) from [<c013c9c8>] >(notifier_call_chain+0x44/0x84) >> [<c013c9c8>] (notifier_call_chain) from [<c013cd20>] >(__blocking_notifier_call_chain+0x48/0x60) >> [<c013cd20>] (__blocking_notifier_call_chain) from [<c013cd50>] >(blocking_notifier_call_chain+0x18/0x20) >> [<c013cd50>] (blocking_notifier_call_chain) from [<c03a6e44>] >(register_framebuffer+0x1e0/0x2f8) >> [<c03a6e44>] (register_framebuffer) from [<c04153c0>] >(__drm_fb_helper_initial_config_and_unlock+0x2fc/0x50c) >> [<c04153c0>] (__drm_fb_helper_initial_config_and_unlock) from >[<c04158c8>] (drm_fbdev_client_hotplug+0xe8/0x1b8) >> [<c04158c8>] (drm_fbdev_client_hotplug) from [<c0415a20>] >(drm_fbdev_generic_setup+0x88/0x118) >> [<c0415a20>] (drm_fbdev_generic_setup) from [<c043f060>] >(sun4i_drv_bind+0x128/0x160) >> [<c043f060>] (sun4i_drv_bind) from [<c044b598>] >(try_to_bring_up_master+0x164/0x1a0) >> [<c044b598>] (try_to_bring_up_master) from [<c044b668>] >(__component_add+0x94/0x140) >> [<c044b668>] (__component_add) from [<c0445e1c>] >(sun6i_dsi_probe+0x144/0x234) >> [<c0445e1c>] (sun6i_dsi_probe) from [<c0452ef4>] >(platform_drv_probe+0x48/0x9c) >> [<c0452ef4>] (platform_drv_probe) from [<c04512cc>] >(really_probe+0x1dc/0x2c8) >> [<c04512cc>] (really_probe) from [<c0451518>] >(driver_probe_device+0x60/0x160) >> [<c0451518>] (driver_probe_device) from [<c044f7a4>] >(bus_for_each_drv+0x74/0xb8) >> [<c044f7a4>] (bus_for_each_drv) from [<c045107c>] >(__device_attach+0xd0/0x13c) >> [<c045107c>] (__device_attach) from [<c0450474>] >(bus_probe_device+0x84/0x8c) >> [<c0450474>] (bus_probe_device) from [<c0450900>] >(deferred_probe_work_func+0x64/0x90) >> [<c0450900>] (deferred_probe_work_func) from [<c0135970>] >(process_one_work+0x204/0x420) >> [<c0135970>] (process_one_work) from [<c013690c>] >(worker_thread+0x274/0x5a0) >> [<c013690c>] (worker_thread) from [<c013b3d8>] (kthread+0x11c/0x14c) >> [<c013b3d8>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c) >> Exception stack(0xde539fb0 to 0xde539ff8) >> 9fa0: 00000000 00000000 00000000 >00000000 >> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 >00000000 >> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 >> ---[ end trace 495200a78b24980e ]--- >> random: fast init done >> [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* >[CRTC:46:crtc-0] flip_done timed out >> [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* >[CONNECTOR:48:DSI-1] flip_done timed out >> [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* >[PLANE:30:plane-0] flip_done timed out >> >> With the terms(as described in above diagram) fixed, the panel >> displays correctly without any timeouts. >> >> Tested-by: Merlijn Wajer <merlijn@wizzup.org> >> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > >you should have your SoB here. > >All the patches look fine, so there's no need to resend a new >version. I'll add it if you can give it. Sorry, I forgot it. Signed-off-by: Icenowy Zheng <icenowy@aosc.io> > >Maxime
On Tue, Oct 08, 2019 at 11:06:07AM +0800, Icenowy Zheng wrote: > 于 2019年10月7日 GMT+08:00 下午7:51:48, Maxime Ripard <mripard@kernel.org> 写到: > >On Mon, Oct 07, 2019 at 12:03:00AM +0800, Icenowy Zheng wrote: > >> From: Jagan Teki <jagan@amarulasolutions.com> > >> > >> The LCD timing definitions between Linux DRM vs Allwinner are > >different, > >> below diagram shows this clear differences. > >> > >> Active Front Sync Back > >> Region Porch > >Porch > >> > ><-----------------------><----------------><--------------><--------------> > >> //////////////////////| > >> ////////////////////// | > >> ////////////////////// |.................. > >................ > >> ________________ > >> <----- [hv]display -----> > >> <------------- [hv]sync_start ------------> > >> <--------------------- [hv]sync_end ----------------------> > >> <-------------------------------- [hv]total > >------------------------------> > >> > >> <----- lcd_[xy] --------> <- lcd_[hv]spw -> > >> <---------- lcd_[hv]bp ---------> > >> <-------------------------------- lcd_[hv]t > >------------------------------> > >> > >> The DSI driver misinterpreted the vbp term from the BSP code to refer > >> only to the backporch, when in fact it was backporch + sync. Thus the > >> driver incorrectly used the vertical front porch plus sync in its > >> calculation of the DRQ set bit value, when it should not have > >included > >> the sync timing. > >> > >> Including additional sync timings leads to flip_done timed out as: > >> > >> WARNING: CPU: 0 PID: 31 at drivers/gpu/drm/drm_atomic_helper.c:1429 > >drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0 > >> [CRTC:46:crtc-0] vblank wait timed out > >> Modules linked in: > >> CPU: 0 PID: 31 Comm: kworker/0:1 Not tainted > >5.1.0-next-20190514-00029-g09e5b0ed0a58 #18 > >> Hardware name: Allwinner sun8i Family > >> Workqueue: events deferred_probe_work_func > >> [<c010ed54>] (unwind_backtrace) from [<c010b76c>] > >(show_stack+0x10/0x14) > >> [<c010b76c>] (show_stack) from [<c0688c70>] (dump_stack+0x84/0x98) > >> [<c0688c70>] (dump_stack) from [<c011d9e4>] (__warn+0xfc/0x114) > >> [<c011d9e4>] (__warn) from [<c011da40>] (warn_slowpath_fmt+0x44/0x68) > >> [<c011da40>] (warn_slowpath_fmt) from [<c040cd50>] > >(drm_atomic_helper_wait_for_vblanks.part.1+0x298/0x2a0) > >> [<c040cd50>] (drm_atomic_helper_wait_for_vblanks.part.1) from > >[<c040e694>] (drm_atomic_helper_commit_tail_rpm+0x5c/0x6c) > >> [<c040e694>] (drm_atomic_helper_commit_tail_rpm) from [<c040e4dc>] > >(commit_tail+0x40/0x6c) > >> [<c040e4dc>] (commit_tail) from [<c040e5cc>] > >(drm_atomic_helper_commit+0xbc/0x128) > >> [<c040e5cc>] (drm_atomic_helper_commit) from [<c0411b64>] > >(restore_fbdev_mode_atomic+0x1cc/0x1dc) > >> [<c0411b64>] (restore_fbdev_mode_atomic) from [<c04156f8>] > >(drm_fb_helper_restore_fbdev_mode_unlocked+0x54/0xa0) > >> [<c04156f8>] (drm_fb_helper_restore_fbdev_mode_unlocked) from > >[<c0415774>] (drm_fb_helper_set_par+0x30/0x54) > >> [<c0415774>] (drm_fb_helper_set_par) from [<c03ad450>] > >(fbcon_init+0x560/0x5ac) > >> [<c03ad450>] (fbcon_init) from [<c03eb8a0>] (visual_init+0xbc/0x104) > >> [<c03eb8a0>] (visual_init) from [<c03ed1b8>] > >(do_bind_con_driver+0x1b0/0x390) > >> [<c03ed1b8>] (do_bind_con_driver) from [<c03ed780>] > >(do_take_over_console+0x13c/0x1c4) > >> [<c03ed780>] (do_take_over_console) from [<c03ad800>] > >(do_fbcon_takeover+0x74/0xcc) > >> [<c03ad800>] (do_fbcon_takeover) from [<c013c9c8>] > >(notifier_call_chain+0x44/0x84) > >> [<c013c9c8>] (notifier_call_chain) from [<c013cd20>] > >(__blocking_notifier_call_chain+0x48/0x60) > >> [<c013cd20>] (__blocking_notifier_call_chain) from [<c013cd50>] > >(blocking_notifier_call_chain+0x18/0x20) > >> [<c013cd50>] (blocking_notifier_call_chain) from [<c03a6e44>] > >(register_framebuffer+0x1e0/0x2f8) > >> [<c03a6e44>] (register_framebuffer) from [<c04153c0>] > >(__drm_fb_helper_initial_config_and_unlock+0x2fc/0x50c) > >> [<c04153c0>] (__drm_fb_helper_initial_config_and_unlock) from > >[<c04158c8>] (drm_fbdev_client_hotplug+0xe8/0x1b8) > >> [<c04158c8>] (drm_fbdev_client_hotplug) from [<c0415a20>] > >(drm_fbdev_generic_setup+0x88/0x118) > >> [<c0415a20>] (drm_fbdev_generic_setup) from [<c043f060>] > >(sun4i_drv_bind+0x128/0x160) > >> [<c043f060>] (sun4i_drv_bind) from [<c044b598>] > >(try_to_bring_up_master+0x164/0x1a0) > >> [<c044b598>] (try_to_bring_up_master) from [<c044b668>] > >(__component_add+0x94/0x140) > >> [<c044b668>] (__component_add) from [<c0445e1c>] > >(sun6i_dsi_probe+0x144/0x234) > >> [<c0445e1c>] (sun6i_dsi_probe) from [<c0452ef4>] > >(platform_drv_probe+0x48/0x9c) > >> [<c0452ef4>] (platform_drv_probe) from [<c04512cc>] > >(really_probe+0x1dc/0x2c8) > >> [<c04512cc>] (really_probe) from [<c0451518>] > >(driver_probe_device+0x60/0x160) > >> [<c0451518>] (driver_probe_device) from [<c044f7a4>] > >(bus_for_each_drv+0x74/0xb8) > >> [<c044f7a4>] (bus_for_each_drv) from [<c045107c>] > >(__device_attach+0xd0/0x13c) > >> [<c045107c>] (__device_attach) from [<c0450474>] > >(bus_probe_device+0x84/0x8c) > >> [<c0450474>] (bus_probe_device) from [<c0450900>] > >(deferred_probe_work_func+0x64/0x90) > >> [<c0450900>] (deferred_probe_work_func) from [<c0135970>] > >(process_one_work+0x204/0x420) > >> [<c0135970>] (process_one_work) from [<c013690c>] > >(worker_thread+0x274/0x5a0) > >> [<c013690c>] (worker_thread) from [<c013b3d8>] (kthread+0x11c/0x14c) > >> [<c013b3d8>] (kthread) from [<c01010e8>] (ret_from_fork+0x14/0x2c) > >> Exception stack(0xde539fb0 to 0xde539ff8) > >> 9fa0: 00000000 00000000 00000000 > >00000000 > >> 9fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 > >00000000 > >> 9fe0: 00000000 00000000 00000000 00000000 00000013 00000000 > >> ---[ end trace 495200a78b24980e ]--- > >> random: fast init done > >> [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* > >[CRTC:46:crtc-0] flip_done timed out > >> [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* > >[CONNECTOR:48:DSI-1] flip_done timed out > >> [drm:drm_atomic_helper_wait_for_dependencies] *ERROR* > >[PLANE:30:plane-0] flip_done timed out > >> > >> With the terms(as described in above diagram) fixed, the panel > >> displays correctly without any timeouts. > >> > >> Tested-by: Merlijn Wajer <merlijn@wizzup.org> > >> Signed-off-by: Jagan Teki <jagan@amarulasolutions.com> > > > >you should have your SoB here. > > > >All the patches look fine, so there's no need to resend a new > >version. I'll add it if you can give it. > > Sorry, I forgot it. > > Signed-off-by: Icenowy Zheng <icenowy@aosc.io> I've added it, thanks! Maxime
diff --git a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c index 082d196e43da..b8a0d0501ca7 100644 --- a/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c +++ b/drivers/gpu/drm/sun4i/sun6i_mipi_dsi.c @@ -366,7 +366,7 @@ static void sun6i_dsi_inst_init(struct sun6i_dsi *dsi, static u16 sun6i_dsi_get_video_start_delay(struct sun6i_dsi *dsi, struct drm_display_mode *mode) { - u16 delay = mode->vtotal - (mode->vsync_end - mode->vdisplay) + 1; + u16 delay = mode->vtotal - (mode->vsync_start - mode->vdisplay) + 1; if (delay > mode->vtotal) delay = delay % mode->vtotal;