6.9-stable review patch. If anyone has any objections, please let me know.
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From: Douglas Anderson dianders@chromium.org
[ Upstream commit 0320ca14c6fb68ad19aa72e55a1a21c061b2946b ]
Based on grepping through the source code, this driver appears to be missing a call to drm_atomic_helper_shutdown() at system shutdown time. This is important because drm_atomic_helper_shutdown() will cause panels to get disabled cleanly which may be important for their power sequencing. Future changes will remove any custom powering off in individual panel drivers so the DRM drivers need to start getting this right.
The fact that we should call drm_atomic_helper_shutdown() in the case of OS shutdown comes straight out of the kernel doc "driver instance overview" in drm_drv.c.
[geert: shmob_drm_remove() already calls drm_atomic_helper_shutdown]
Suggested-by: Maxime Ripard mripard@kernel.org Signed-off-by: Douglas Anderson dianders@chromium.org Link: https://lore.kernel.org/r/20230901164111.RFT.15.Iaf638a1d4c8b3c307a6192efabb... [geert: s/drm_helper_force_disable_all/drm_atomic_helper_shutdown/] Signed-off-by: Geert Uytterhoeven geert+renesas@glider.be Reviewed-by: Laurent Pinchart laurent.pinchart@ideasonboard.com Reviewed-by: Sui Jingfeng sui.jingfeng@linux.dev Signed-off-by: Maxime Ripard mripard@kernel.org Link: https://patchwork.freedesktop.org/patch/msgid/17c6a5a668e5975f871b77fb1fca67... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c | 8 ++++++++ 1 file changed, 8 insertions(+)
diff --git a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c index e83c3e52251de..0250d5f00bf10 100644 --- a/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c +++ b/drivers/gpu/drm/renesas/shmobile/shmob_drm_drv.c @@ -171,6 +171,13 @@ static void shmob_drm_remove(struct platform_device *pdev) drm_kms_helper_poll_fini(ddev); }
+static void shmob_drm_shutdown(struct platform_device *pdev) +{ + struct shmob_drm_device *sdev = platform_get_drvdata(pdev); + + drm_atomic_helper_shutdown(&sdev->ddev); +} + static int shmob_drm_probe(struct platform_device *pdev) { struct shmob_drm_platform_data *pdata = pdev->dev.platform_data; @@ -273,6 +280,7 @@ static const struct of_device_id shmob_drm_of_table[] __maybe_unused = { static struct platform_driver shmob_drm_platform_driver = { .probe = shmob_drm_probe, .remove_new = shmob_drm_remove, + .shutdown = shmob_drm_shutdown, .driver = { .name = "shmob-drm", .of_match_table = of_match_ptr(shmob_drm_of_table),