On Mon, 2018-11-05 at 18:08 +0100, Lucas Stach wrote:
> While 144MHz is listed in the datasheet as the typical pixel clock
> this leads to a vrefresh rate of 64Fps, which is not what most people
> expect. Change this to 135MHz to provide a more common 60Fps refresh
> rate.
>
> Signed-off-by: Lucas Stach <l.stach@xxxxxxxxxxxxxx>
> ---
> 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 97964f7f2ace..2243151c4c34 100644
> --- a/drivers/gpu/drm/panel/panel-simple.c
> +++ b/drivers/gpu/drm/panel/panel-simple.c
> @@ -661,7 +661,7 @@ static const struct panel_desc auo_g133han01 = {
> };
>
> static const struct display_timing auo_g185han01_timings = {
> - .pixelclock = { 120000000, 144000000, 175000000 },
> + .pixelclock = { 120000000, 135000000, 175000000 },
> .hactive = { 1920, 1920, 1920 },
> .hfront_porch = { 18, 60, 74 },
> .hback_porch = { 12, 44, 54 },
Looking at the datasheet, the typical horizontal blanking is given as
128 clocks per LVDS channel. Since hactive is doubled for dual-LVDS, the
blanking intervals should be doubled as well.
With that, (960+128)*2 * (1080+20) * 60 = 143.616 MHz.
That would be about 60.16 Hz at 144 MHz.
regards
Philipp
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