5.15-stable review patch. If anyone has any objections, please let me know.
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From: Chris Morgan macromorgan@hotmail.com
[ Upstream commit 03c5b2a5f6c39fe4e090346536cf1c14ee18b61e ]
For devices like the Anbernic RG351M and RG351P the panel is wired to an always on regulator. When the device suspends and wakes up, there are some slight artifacts on the screen that go away over time. If instead we hold the panel in reset status after it is unprepared, this does not happen.
Fixes: 5b6603360c12 ("drm/panel: add panel driver for Elida KD35T133 panels") Signed-off-by: Chris Morgan macromorgan@hotmail.com Reviewed-by: Jessica Zhang quic_jesszhan@quicinc.com Link: https://lore.kernel.org/r/20231117194405.1386265-3-macroalpha82@gmail.com Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Link: https://patchwork.freedesktop.org/patch/msgid/20231117194405.1386265-3-macro... Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/gpu/drm/panel/panel-elida-kd35t133.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/drivers/gpu/drm/panel/panel-elida-kd35t133.c b/drivers/gpu/drm/panel/panel-elida-kd35t133.c index 80227617a4d6..ccb7d521f30a 100644 --- a/drivers/gpu/drm/panel/panel-elida-kd35t133.c +++ b/drivers/gpu/drm/panel/panel-elida-kd35t133.c @@ -112,6 +112,8 @@ static int kd35t133_unprepare(struct drm_panel *panel) return ret; }
+ gpiod_set_value_cansleep(ctx->reset_gpio, 1); + regulator_disable(ctx->iovcc); regulator_disable(ctx->vdd);