From 36830ce4eb2b5f6fe796c457b4043160c0e1e1fe Mon Sep 17 00:00:00 2001 From: Philippe CORNU Date: Mon, 23 Apr 2018 16:10:51 +0200 Subject: drm/panel: otm8009a: Fix glitches by moving backlight enable to otm8009a_enable() The backlight 1st update was in the otm8009a_prepare() function for a bad reason: backlight was not working in video mode and the otm8009a_prepare() is in command mode for the init sequence. As the backlight is now fixed (no low-power mode), it is good to put it back in the otm8009a_enable() function, avoiding also image glitches visible on some "slow" devices. Signed-off-by: Philippe Cornu Signed-off-by: Thierry Reding Link: https://patchwork.freedesktop.org/patch/msgid/20180423141054.13128-3-philippe.cornu@st.com --- drivers/gpu/drm/panel/panel-orisetech-otm8009a.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) (limited to 'drivers/gpu/drm/panel/panel-orisetech-otm8009a.c') diff --git a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c index 0fd2e0144d2b..de4a16d5275c 100644 --- a/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c +++ b/drivers/gpu/drm/panel/panel-orisetech-otm8009a.c @@ -330,13 +330,6 @@ static int otm8009a_prepare(struct drm_panel *panel) ctx->prepared = true; - /* - * Power on the backlight. Note: end-user still controls brightness - * Note: ctx->prepared must be true before updating the backlight. - */ - ctx->bl_dev->props.power = FB_BLANK_UNBLANK; - backlight_update_status(ctx->bl_dev); - return 0; } @@ -344,6 +337,16 @@ static int otm8009a_enable(struct drm_panel *panel) { struct otm8009a *ctx = panel_to_otm8009a(panel); + if (ctx->enabled) + return 0; + + /* + * Power on the backlight. Note: end-user still controls brightness + * Note: ctx->prepared must be true before updating the backlight. + */ + ctx->bl_dev->props.power = FB_BLANK_UNBLANK; + backlight_update_status(ctx->bl_dev); + ctx->enabled = true; return 0; -- cgit v1.2.3