drm/edid: Ignore bad standard timings. (23425cae) · Commits · e / devices / android_kernel_fairphone_FP4

drivers/gpu/drm/drm_edid.c

+16 −0

Original line number	Diff line number	Diff line
		@@ -502,6 +502,19 @@ static struct drm_display_mode drm_find_dmt(struct drm_device dev,
		}
		return mode;
		}

		/*
		* 0 is reserved. The spec says 0x01 fill for unused timings. Some old
		* monitors fill with ascii space (0x20) instead.
		*/
		static int
		bad_std_timing(u8 a, u8 b)
		{
		return (a == 0x00 && b == 0x00) \|\|
		(a == 0x01 && b == 0x01) \|\|
		(a == 0x20 && b == 0x20);
		}

		/**
		* drm_mode_std - convert standard mode info (width, height, refresh) into mode
		* @t: standard timing params
		@@ -525,6 +538,9 @@ struct drm_display_mode drm_mode_std(struct drm_device dev,
		unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)
		>> EDID_TIMING_VFREQ_SHIFT;

		if (bad_std_timing(t->hsize, t->vfreq_aspect))
		return NULL;

		/* According to the EDID spec, the hdisplay = hsize * 8 + 248 */
		hsize = t->hsize * 8 + 248;
		/* vrefresh_rate = vfreq + 60 */