Commit 5c61259e authored by Zhao Yakui's avatar Zhao Yakui Committed by Dave Airlie
Browse files

drm/mode: get the modeline for standard timing in EDID by using CVT/GTF 



Create the standard timing modeline by using CVT/GFT algorithm while
interpreting the EDID.

In course of interpreting the EDID, the timing level will be obtained,
which is used to determine whether the CVT/GTF algorithm is selected to
generate the modeline for the given hdisplay/vdisplay/vrefresh_rate.
In the UMS mode firstly it will check whether it can be found in
the DMT table. If it can be found, then the modeline is returned. Then the
timing_level is used to choose CVT/GTF.
As there is no DMT table, no modeline is returned when timing level
is DMT. For the other two timing levels, the CVT/GTF will be called to
generate the required standard timing modeline.

[airlied: fixed up conflicts since EDID rework]

Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarDave Airlie <airlied@linux.ie>
parent 26bbdada

drivers/gpu/drm/drm_edid.c

+58 −12
Original line number Diff line number Diff line
@@ -61,6 +61,10 @@ 
/* use +hsync +vsync for detailed mode */

#define EDID_QUIRK_DETAILED_SYNC_PP		(1 << 6)



#define LEVEL_DMT	0

#define LEVEL_GTF	1

#define LEVEL_CVT	2



static struct edid_quirk {

	char *vendor;

	int product_id;
@@ -240,25 +244,31 @@ static void edid_fixup_preferred(struct drm_connector *connector, 
/**

 * drm_mode_std - convert standard mode info (width, height, refresh) into mode

 * @t: standard timing params

 * @timing_level: standard timing level

 *

 * Take the standard timing params (in this case width, aspect, and refresh)

 * and convert them into a real mode using CVT.

 * and convert them into a real mode using CVT/GTF/DMT.

 *

 * Punts for now, but should eventually use the FB layer's CVT based mode

 * generation code.

 */

struct drm_display_mode *drm_mode_std(struct drm_device *dev,

				      struct std_timing *t)

				      struct std_timing *t,

				      int timing_level)

{

	struct drm_display_mode *mode;

	int hsize = t->hsize * 8 + 248, vsize;

	int hsize, vsize;

	int vrefresh_rate;

	unsigned aspect_ratio = (t->vfreq_aspect & EDID_TIMING_ASPECT_MASK)

		>> EDID_TIMING_ASPECT_SHIFT;



	mode = drm_mode_create(dev);

	if (!mode)

		return NULL;



	unsigned vfreq = (t->vfreq_aspect & EDID_TIMING_VFREQ_MASK)

		>> EDID_TIMING_VFREQ_SHIFT;



	/* According to the EDID spec, the hdisplay = hsize * 8 + 248 */

	hsize = t->hsize * 8 + 248;

	/* vrefresh_rate = vfreq + 60 */

	vrefresh_rate = vfreq + 60;

	/* the vdisplay is calculated based on the aspect ratio */

	if (aspect_ratio == 0)

		vsize = (hsize * 10) / 16;

	else if (aspect_ratio == 1)
@@ -268,8 +278,23 @@ struct drm_display_mode *drm_mode_std(struct drm_device *dev, 
	else

		vsize = (hsize * 9) / 16;



	mode = NULL;

	switch (timing_level) {

	case LEVEL_DMT:

		mode = drm_mode_create(dev);

		if (mode) {

			mode->hdisplay = hsize;

			mode->vdisplay = vsize;

			drm_mode_set_name(mode);



		}

		break;

	case LEVEL_GTF:

		mode = drm_gtf_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);

		break;

	case LEVEL_CVT:

		mode = drm_cvt_mode(dev, hsize, vsize, vrefresh_rate, 0, 0);

		break;

	}

	return mode;

}
@@ -451,6 +476,19 @@ static int add_established_modes(struct drm_connector *connector, struct edid *e 


	return modes;

}

/**

 * stanard_timing_level - get std. timing level(CVT/GTF/DMT)

 * @edid: EDID block to scan

 */

static int standard_timing_level(struct edid *edid)

{

	if (edid->revision >= 2) {

		if (edid->revision >= 4 && (edid->features & DRM_EDID_FEATURE_DEFAULT_GTF))

			return LEVEL_CVT;

		return LEVEL_GTF;

	}

	return LEVEL_DMT;

}



/**

 * add_standard_modes - get std. modes from EDID and add them
@@ -463,6 +501,9 @@ static int add_standard_modes(struct drm_connector *connector, struct edid *edid 
{

	struct drm_device *dev = connector->dev;

	int i, modes = 0;

	int timing_level;



	timing_level = standard_timing_level(edid);



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

		struct std_timing *t = &edid->standard_timings[i];
@@ -472,7 +513,8 @@ static int add_standard_modes(struct drm_connector *connector, struct edid *edid 
		if (t->hsize == 1 && t->vfreq_aspect == 1)

			continue;



		newmode = drm_mode_std(dev, &edid->standard_timings[i]);

		newmode = drm_mode_std(dev, &edid->standard_timings[i],

					timing_level);

		if (newmode) {

			drm_mode_probed_add(connector, newmode);

			modes++;
@@ -496,6 +538,9 @@ static int add_detailed_info(struct drm_connector *connector, 
{

	struct drm_device *dev = connector->dev;

	int i, j, modes = 0;

	int timing_level;



	timing_level = standard_timing_level(edid);



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

		struct detailed_timing *timing = &edid->detailed_timings[i];
@@ -541,7 +586,8 @@ static int add_detailed_info(struct drm_connector *connector, 
				struct drm_display_mode *newmode;



				std = &data->data.timings[j];

				newmode = drm_mode_std(dev, std);

				newmode = drm_mode_std(dev, std,

							timing_level);

				if (newmode) {

					drm_mode_probed_add(connector, newmode);

					modes++;

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