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SubjectRe: [PATCH] drm/edid: add support for min horizontal rate equal to max horizontal rate
On Tue, Jun 09, 2020 at 03:57:04AM +0800, Cyrus Lien wrote:
> According to EDID spec, table 3.26, byte #6 and #8, which said "Minimum
> rate value shall be less than or equal to maximum rate value". The minimum
> horizontal/vertical rate value is able to be equal to maximum horizontal/
> veritcal rate value.

How does that justifiy ignoring the min value?

>
> This change check if h/v-sync excess maximum horizontal/vertical rate if
> hmin equal to hmax or vmin equal to vmax.
>
> Signed-off-by: Cyrus Lien <cyrus.lien@canonical.com>
> ---
> drivers/gpu/drm/drm_edid.c | 6 ++++++
> 1 file changed, 6 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index fed653f13c26..23878320eabd 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -2674,6 +2674,9 @@ mode_in_hsync_range(const struct drm_display_mode *mode,
> hmax += ((t[4] & 0x08) ? 255 : 0);
> hsync = drm_mode_hsync(mode);
>
> + if (hmax == hmin)
> + return (hsync <= hmax);
> +
> return (hsync <= hmax && hsync >= hmin);
> }
>
> @@ -2691,6 +2694,9 @@ mode_in_vsync_range(const struct drm_display_mode *mode,
> vmax += ((t[4] & 0x02) ? 255 : 0);
> vsync = drm_mode_vrefresh(mode);
>
> + if (vmax == vmin)
> + return (vsync <= vmax);
> +
> return (vsync <= vmax && vsync >= vmin);
> }
>
> --
> 2.25.1
>
> _______________________________________________
> dri-devel mailing list
> dri-devel@lists.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/dri-devel

--
Ville Syrjälä
Intel

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