drm/edid: Add detailed block walk for CEA extensions (4d76a221) · Commits · e / devices / android_kernel_xiaomi_markw

drivers/gpu/drm/drm_edid.c

+37 −1

Original line number	Diff line number	Diff line
		@@ -684,6 +684,33 @@ EXPORT_SYMBOL(drm_mode_find_dmt);

		typedef void detailed_cb(struct detailed_timing timing, void closure);

		static void
		cea_for_each_detailed_block(u8 ext, detailed_cb cb, void *closure)
		{
		int i, n = 0;
		u8 rev = ext[0x01], d = ext[0x02];
		u8 *det_base = ext + d;

		switch (rev) {
		case 0:
		/* can't happen */
		return;
		case 1:
		/* have to infer how many blocks we have, check pixel clock */
		for (i = 0; i < 6; i++)
		if (det_base[18i] \|\| det_base[18i+1])
		n++;
		break;
		default:
		/* explicit count */
		n = min(ext[0x03] & 0x0f, 6);
		break;
		}

		for (i = 0; i < n; i++)
		cb((struct detailed_timing )(det_base + 18 i), closure);
		}

		static void
		drm_for_each_detailed_block(u8 raw_edid, detailed_cb cb, void *closure)
		{
		@@ -696,7 +723,16 @@ drm_for_each_detailed_block(u8 raw_edid, detailed_cb cb, void *closure)
		for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
		cb(&(edid->detailed_timings[i]), closure);

		/* XXX extension block walk */
		for (i = 1; i <= raw_edid[0x7e]; i++) {
		u8 ext = raw_edid + (i EDID_LENGTH);
		switch (*ext) {
		case CEA_EXT:
		cea_for_each_detailed_block(ext, cb, closure);
		break;
		default:
		break;
		}
		}
		}

		static void

+6 −0