Commit b17e52ef authored by Adam Jackson's avatar Adam Jackson Committed by Dave Airlie
Browse files

drm/edid: Extend range-based mode addition for EDID 1.4 



1.4 adds better pixel clock precision, explicit reduced blanking
awareness, and extended sync ranges.  It's almost like a real spec.

Signed-off-by: default avatarAdam Jackson <ajax@redhat.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent d1ff6409

drivers/gpu/drm/drm_edid.c

+78 −23
Original line number Diff line number Diff line
@@ -1066,36 +1066,89 @@ static int add_standard_modes(struct drm_connector *connector, struct edid *edid 
	return modes;

}



static bool

mode_is_rb(struct drm_display_mode *mode)

{

	return (mode->htotal - mode->hdisplay == 160) &&

	       (mode->hsync_end - mode->hdisplay == 80) &&

	       (mode->hsync_end - mode->hsync_start == 32) &&

	       (mode->vsync_start - mode->vdisplay == 3);

}



static bool

mode_in_hsync_range(struct drm_display_mode *mode, struct edid *edid, u8 *t)

{

	int hsync, hmin, hmax;



	hmin = t[7];

	if (edid->revision >= 4)

	    hmin += ((t[4] & 0x04) ? 255 : 0);

	hmax = t[8];

	if (edid->revision >= 4)

	    hmax += ((t[4] & 0x08) ? 255 : 0);

	hsync = drm_mode_hsync(mode);



	return (hsync <= hmax && hsync >= hmin);

}



static bool

mode_in_vsync_range(struct drm_display_mode *mode, struct edid *edid, u8 *t)

{

	int vsync, vmin, vmax;



	vmin = t[5];

	if (edid->revision >= 4)

	    vmin += ((t[4] & 0x01) ? 255 : 0);

	vmax = t[6];

	if (edid->revision >= 4)

	    vmax += ((t[4] & 0x02) ? 255 : 0);

	vsync = drm_mode_vrefresh(mode);



	return (vsync <= vmax && vsync >= vmin);

}



static u32

range_pixel_clock(struct edid *edid, u8 *t)

{

	/* unspecified */

	if (t[9] == 0 || t[9] == 255)

		return 0;



	/* 1.4 with CVT support gives us real precision, yay */

	if (edid->revision >= 4 && t[10] == 0x04)

		return (t[9] * 10000) - ((t[12] >> 2) * 250);



	/* 1.3 is pathetic, so fuzz up a bit */

	return t[9] * 10000 + 5001;

}



/*

 * XXX fix this for:

 * - GTF secondary curve formula

 * - EDID 1.4 range offsets

 * - CVT extended bits

 * XXX fix this for GTF secondary curve formula

 */

static bool

mode_in_range(struct drm_display_mode *mode, struct detailed_timing *timing)

mode_in_range(struct drm_display_mode *mode, struct edid *edid,

	      struct detailed_timing *timing)

{

	struct detailed_data_monitor_range *range;

	int hsync, vrefresh;

	u32 max_clock;

	u8 *t = (u8 *)timing;



	range = &timing->data.other_data.data.range;

	if (!mode_in_hsync_range(mode, edid, t))

		return false;



	hsync = drm_mode_hsync(mode);

	vrefresh = drm_mode_vrefresh(mode);

	if (!mode_in_vsync_range(mode, edid, t))

		return false;



	if (hsync < range->min_hfreq_khz || hsync > range->max_hfreq_khz)

	if ((max_clock = range_pixel_clock(edid, t)))

		if (mode->clock > max_clock)

			return false;



	if (vrefresh < range->min_vfreq || vrefresh > range->max_vfreq)

	/* 1.4 max horizontal check */

	if (edid->revision >= 4 && t[10] == 0x04)

		if (t[13] && mode->hdisplay > 8 * (t[13] + (256 * (t[12]&0x3))))

			return false;



	if (range->pixel_clock_mhz && range->pixel_clock_mhz != 0xff) {

		/* be forgiving since it's in units of 10MHz */

		int max_clock = range->pixel_clock_mhz * 10 + 9;

		max_clock *= 1000;

		if (mode->clock > max_clock)

	if (mode_is_rb(mode) && !drm_monitor_supports_rb(edid))

		return false;

	}



	return true;

}
@@ -1104,7 +1157,8 @@ mode_in_range(struct drm_display_mode *mode, struct detailed_timing *timing) 
 * XXX If drm_dmt_modes ever regrows the CVT-R modes (and it will) this will

 * need to account for them.

 */

static int drm_gtf_modes_for_range(struct drm_connector *connector,

static int

drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid,

			struct detailed_timing *timing)

{

	int i, modes = 0;
@@ -1112,7 +1166,7 @@ static int drm_gtf_modes_for_range(struct drm_connector *connector, 
	struct drm_device *dev = connector->dev;



	for (i = 0; i < drm_num_dmt_modes; i++) {

		if (mode_in_range(drm_dmt_modes + i, timing)) {

		if (mode_in_range(drm_dmt_modes + i, edid, timing)) {

			newmode = drm_mode_duplicate(dev, &drm_dmt_modes[i]);

			if (newmode) {

				drm_mode_probed_add(connector, newmode);
@@ -1288,7 +1342,8 @@ static int add_detailed_modes(struct drm_connector *connector, 
	switch (data->type) {

	case EDID_DETAIL_MONITOR_RANGE:

		if (gtf)

			modes += drm_gtf_modes_for_range(connector, timing);

			modes += drm_gtf_modes_for_range(connector, edid,

							 timing);

		break;

	case EDID_DETAIL_STD_MODES:

		/* Six modes per detailed section */

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