This panel has been implemented in commit 225213f24c79 ("drm/panel-simple:
Add Innolux G156HCE-L01 panel entry") with a higher clock than the typical
one mentioned on the documentation to avoid flickering on the unit
tested. Testing on a different unit shows that the panel actually works
with the intended 70.93 MHz clock and even lower frequencies so the
flickering is likely caused either by a defective unit or by other
different components such as the bridge.

Fixes: eae7488814b5 ("drm/panel-simple: Add Innolux G156HCE-L01 panel entry")
Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
Tested-by: Marek Vasut <marex@denx.de> # MX8MM with LT9211
Reviewed-by: Marek Vasut <marex@denx.de>

---

Changed in v2:
 - fix commit hash in "Fixes:" line
 - add tested/reviewed by Marek
---
 drivers/gpu/drm/panel/panel-simple.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
index 701013b3ad13..a1bbc7f11e83 100644
--- a/drivers/gpu/drm/panel/panel-simple.c
+++ b/drivers/gpu/drm/panel/panel-simple.c
@@ -2379,7 +2379,7 @@ static const struct panel_desc innolux_g121x1_l03 = {
 };
 
 static const struct display_timing innolux_g156hce_l01_timings = {
-	.pixelclock = { 120000000, 144000000, 150000000 },
+	.pixelclock = { 120000000, 141860000, 150000000 },
 	.hactive = { 1920, 1920, 1920 },
 	.hfront_porch = { 80, 90, 100 },
 	.hback_porch = { 80, 90, 100 },
-- 
2.34.1

Hi,

On Mon, 14 Aug 2023 15:40:24 +0200, Luca Ceresoli wrote:
> This panel has been implemented in commit 225213f24c79 ("drm/panel-simple:
> Add Innolux G156HCE-L01 panel entry") with a higher clock than the typical
> one mentioned on the documentation to avoid flickering on the unit
> tested. Testing on a different unit shows that the panel actually works
> with the intended 70.93 MHz clock and even lower frequencies so the
> flickering is likely caused either by a defective unit or by other
> different components such as the bridge.
> 
> [...]

Thanks, Applied to https://anongit.freedesktop.org/git/drm/drm-misc.git (drm-misc-next-fixes)

[1/1] drm/panel: simple: Fix Innolux G156HCE-L01 LVDS clock
      https://cgit.freedesktop.org/drm/drm-misc/commit/?id=438cf3271ca116253cffb8edce8aba0191327682

-- 
Neil

Hi,

On 14/08/2023 15:40, Luca Ceresoli wrote:
> This panel has been implemented in commit 225213f24c79 ("drm/panel-simple:
> Add Innolux G156HCE-L01 panel entry") with a higher clock than the typical
> one mentioned on the documentation to avoid flickering on the unit
> tested. Testing on a different unit shows that the panel actually works
> with the intended 70.93 MHz clock and even lower frequencies so the
> flickering is likely caused either by a defective unit or by other
> different components such as the bridge.
> 
> Fixes: eae7488814b5 ("drm/panel-simple: Add Innolux G156HCE-L01 panel entry")
> Signed-off-by: Luca Ceresoli <luca.ceresoli@bootlin.com>
> Tested-by: Marek Vasut <marex@denx.de> # MX8MM with LT9211
> Reviewed-by: Marek Vasut <marex@denx.de>
> 
> ---
> 
> Changed in v2:
>   - fix commit hash in "Fixes:" line
>   - add tested/reviewed by Marek
> ---
>   drivers/gpu/drm/panel/panel-simple.c | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/panel/panel-simple.c b/drivers/gpu/drm/panel/panel-simple.c
> index 701013b3ad13..a1bbc7f11e83 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -2379,7 +2379,7 @@ static const struct panel_desc innolux_g121x1_l03 = {
>   };
>   
>   static const struct display_timing innolux_g156hce_l01_timings = {
> -	.pixelclock = { 120000000, 144000000, 150000000 },
> +	.pixelclock = { 120000000, 141860000, 150000000 },
>   	.hactive = { 1920, 1920, 1920 },
>   	.hfront_porch = { 80, 90, 100 },
>   	.hback_porch = { 80, 90, 100 },

I'll apply once drm-misc-next-fixes is aligned on the last drm-misc-next tag
for v6.6.

Thanks,
Neil