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| author | Douglas Anderson <dianders@chromium.org> | 2023-09-01 16:39:56 -0700 |
|---|---|---|
| committer | Douglas Anderson <dianders@chromium.org> | 2023-09-21 10:51:55 -0700 |
| commit | 3c4babae3c4a1ae05f8f3f5f3d50c440ead7ca6a (patch) | |
| tree | 43939c4253e5188757bacd17d54c667609e855b4 /drivers/gpu/drm/stm | |
| parent | 10c8204c8b172234f11a0482a89fb4affadfaab5 (diff) | |
| download | lwn-3c4babae3c4a1ae05f8f3f5f3d50c440ead7ca6a.tar.gz lwn-3c4babae3c4a1ae05f8f3f5f3d50c440ead7ca6a.zip | |
drm: Call drm_atomic_helper_shutdown() at shutdown/remove time for misc drivers
Based on grepping through the source code these drivers appear to be
missing a call to drm_atomic_helper_shutdown() at system shutdown time
and at driver remove (or unbind) time. Among other things, this means
that if a panel is in use that it won't be cleanly powered off at
system shutdown time.
The fact that we should call drm_atomic_helper_shutdown() in the case
of OS shutdown/restart and at driver remove (or unbind) time comes
straight out of the kernel doc "driver instance overview" in
drm_drv.c.
A few notes about these fixes:
- I confirmed that these drivers were all DRIVER_MODESET type drivers,
which I believe makes this relevant.
- I confirmed that these drivers were all DRIVER_ATOMIC.
- When adding drm_atomic_helper_shutdown() to the remove/unbind path,
I added it after drm_kms_helper_poll_fini() when the driver had
it. This seemed to be what other drivers did. If
drm_kms_helper_poll_fini() wasn't there I added it straight after
drm_dev_unregister().
- This patch deals with drivers using the component model in similar
ways as the patch ("drm: Call drm_atomic_helper_shutdown() at
shutdown time for misc drivers")
- These fixes rely on the patch ("drm/atomic-helper:
drm_atomic_helper_shutdown(NULL) should be a noop") to simplify
shutdown.
Suggested-by: Maxime Ripard <mripard@kernel.org>
Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Tested-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com> # tilcdc
Acked-by: Maxime Ripard <mripard@kernel.org>
Signed-off-by: Douglas Anderson <dianders@chromium.org>
Link: https://patchwork.freedesktop.org/patch/msgid/20230901163944.RFT.5.I771eb4bd03d8772b19e7dcfaef3e2c167bce5846@changeid
Diffstat (limited to 'drivers/gpu/drm/stm')
| -rw-r--r-- | drivers/gpu/drm/stm/drv.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/gpu/drm/stm/drv.c b/drivers/gpu/drm/stm/drv.c index c68c831136c9..e8523abef27a 100644 --- a/drivers/gpu/drm/stm/drv.c +++ b/drivers/gpu/drm/stm/drv.c @@ -114,6 +114,7 @@ static void drv_unload(struct drm_device *ddev) DRM_DEBUG("%s\n", __func__); drm_kms_helper_poll_fini(ddev); + drm_atomic_helper_shutdown(ddev); ltdc_unload(ddev); } @@ -225,6 +226,11 @@ static void stm_drm_platform_remove(struct platform_device *pdev) drm_dev_put(ddev); } +static void stm_drm_platform_shutdown(struct platform_device *pdev) +{ + drm_atomic_helper_shutdown(platform_get_drvdata(pdev)); +} + static const struct of_device_id drv_dt_ids[] = { { .compatible = "st,stm32-ltdc"}, { /* end node */ }, @@ -234,6 +240,7 @@ MODULE_DEVICE_TABLE(of, drv_dt_ids); static struct platform_driver stm_drm_platform_driver = { .probe = stm_drm_platform_probe, .remove_new = stm_drm_platform_remove, + .shutdown = stm_drm_platform_shutdown, .driver = { .name = "stm32-display", .of_match_table = drv_dt_ids, |