drm/edid: Add test for monitor reduced blanking support. (d1ff6409) · Commits · 戴 / test

drivers/gpu/drm/drm_edid.c

+43 −4

Original line number	Diff line number	Diff line
		@@ -33,6 +33,10 @@
		#include "drmP.h"
		#include "drm_edid.h"

		#define EDID_EST_TIMINGS 16
		#define EDID_STD_TIMINGS 8
		#define EDID_DETAILED_TIMINGS 4

		/*
		* EDID blocks out in the wild have a variety of bugs, try to collect
		* them here (note that userspace may work around broken monitors first,
		@@ -670,6 +674,45 @@ static struct drm_display_mode drm_find_dmt(struct drm_device dev,
		return mode;
		}

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

		static void
		drm_for_each_detailed_block(u8 raw_edid, detailed_cb cb, void *closure)
		{
		int i;
		struct edid edid = (struct edid )raw_edid;

		if (edid == NULL)
		return;

		for (i = 0; i < EDID_DETAILED_TIMINGS; i++)
		cb(&(edid->detailed_timings[i]), closure);

		/* XXX extension block walk */
		}

		static void
		is_rb(struct detailed_timing t, void data)
		{
		u8 r = (u8 )t;
		if (r[3] == EDID_DETAIL_MONITOR_RANGE)
		if (r[15] & 0x10)
		(bool )data = true;
		}

		/* EDID 1.4 defines this explicitly. For EDID 1.3, we guess, badly. */
		static bool
		drm_monitor_supports_rb(struct edid *edid)
		{
		if (edid->revision >= 4) {
		bool ret;
		drm_for_each_detailed_block((u8 *)edid, is_rb, &ret);
		return ret;
		}

		return ((edid->input & DRM_EDID_INPUT_DIGITAL) != 0);
		}

		/*
		* 0 is reserved. The spec says 0x01 fill for unused timings. Some old
		* monitors fill with ascii space (0x20) instead.
		@@ -952,10 +995,6 @@ static struct drm_display_mode edid_est_modes[] = {
		DRM_MODE_FLAG_PHSYNC \| DRM_MODE_FLAG_PVSYNC) }, /* 1152x864@75Hz */
		};

		#define EDID_EST_TIMINGS 16
		#define EDID_STD_TIMINGS 8
		#define EDID_DETAILED_TIMINGS 4

		/**
		* add_established_modes - get est. modes from EDID and add them
		* @edid: EDID block to scan

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