6.12-stable review patch. If anyone has any objections, please let me know.
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From: Hugo Villeneuve hvilleneuve@dimonoff.com
commit 095c8e61f4c71cd4630ee11a82e82cc341b38464 upstream.
commit a8972d5a49b4 ("drm: panel: jd9365da-h3: fix reset signal polarity") fixed reset signal polarity in jadard_dsi_probe() and jadard_prepare().
It was not done in jadard_unprepare() because of an incorrect assumption about reset line handling in power off mode. After looking into the datasheet, it now appears that before disabling regulators, the reset line is deasserted first, and if reset_before_power_off_vcioo is true, then the reset line is asserted.
Fix reset polarity by inverting gpiod_set_value() second argument in in jadard_unprepare().
Fixes: 6b818c533dd8 ("drm: panel: Add Jadard JD9365DA-H3 DSI panel") Fixes: 2b976ad760dc ("drm/panel: jd9365da: Support for kd101ne3-40ti MIPI-DSI panel") Fixes: a8972d5a49b4 ("drm: panel: jd9365da-h3: fix reset signal polarity") Cc: stable@vger.kernel.org Signed-off-by: Hugo Villeneuve hvilleneuve@dimonoff.com Reviewed-by: Neil Armstrong neil.armstrong@linaro.org Link: https://lore.kernel.org/r/20250417195507.778731-1-hugo@hugovil.com Signed-off-by: Neil Armstrong neil.armstrong@linaro.org Link: https://lore.kernel.org/r/20250417195507.778731-1-hugo@hugovil.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c +++ b/drivers/gpu/drm/panel/panel-jadard-jd9365da-h3.c @@ -129,11 +129,11 @@ static int jadard_unprepare(struct drm_p { struct jadard *jadard = panel_to_jadard(panel);
- gpiod_set_value(jadard->reset, 1); + gpiod_set_value(jadard->reset, 0); msleep(120);
if (jadard->desc->reset_before_power_off_vcioo) { - gpiod_set_value(jadard->reset, 0); + gpiod_set_value(jadard->reset, 1);
usleep_range(1000, 2000); }