Commit 559ee21d authored by Zhao Yakui's avatar Zhao Yakui Committed by Dave Airlie
Browse files

drm/kms: try to find the std mode in DMT table 



When we need to add the standard timing mode, we will firstly check whether it
can be found in DMT table by comparing the hdisplay/vdisplay/vfresh_rate.
If it can't be found, then we will use the cvt/gtf to add the required mode.
If it can be found, it will be returned.

At the same time the function of drm_mode_vrefresh is also fixed. It will
return the result of actual refresh_rate plus 0.5.
For example:
When the calculated value is 84.9, then the fresh_rate is 85.
When the calculated value is 70.02, then the fresh_rate is 70.

Signed-off-by: default avatarZhao Yakui <yakui.zhao@intel.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent aa9eaa1f

drivers/gpu/drm/drm_edid.c

+33 −7
Original line number Diff line number Diff line
@@ -480,6 +480,26 @@ static struct drm_display_mode drm_dmt_modes[] = { 
		   DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC) },

};



static struct drm_display_mode *drm_find_dmt(struct drm_device *dev,

			int hsize, int vsize, int fresh)

{

	int i, count;

	struct drm_display_mode *ptr, *mode;



	count = sizeof(drm_dmt_modes) / sizeof(struct drm_display_mode);

	mode = NULL;

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

		ptr = &drm_dmt_modes[i];

		if (hsize == ptr->hdisplay &&

			vsize == ptr->vdisplay &&

			fresh == drm_mode_vrefresh(ptr)) {

			/* get the expected default mode */

			mode = drm_mode_duplicate(dev, ptr);

			break;

		}

	}

	return mode;

}

/**

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

 * @t: standard timing params
@@ -516,16 +536,22 @@ struct drm_display_mode *drm_mode_std(struct drm_device *dev, 
		vsize = (hsize * 4) / 5;

	else

		vsize = (hsize * 9) / 16;



	/* HDTV hack */

	if (hsize == 1360 && vsize == 765 && vrefresh_rate == 60) {

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

		mode->hdisplay = 1366;

		mode->vsync_start = mode->vsync_start - 1;

		mode->vsync_end = mode->vsync_end - 1;

		return mode;

	}

	mode = NULL;

	/* check whether it can be found in default mode table */

	mode = drm_find_dmt(dev, hsize, vsize, vrefresh_rate);

	if (mode)

		return mode;



	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);

drivers/gpu/drm/drm_modes.c

+6 −5
Original line number Diff line number Diff line
@@ -566,7 +566,9 @@ EXPORT_SYMBOL(drm_mode_height); 
 * FIXME: why is this needed?  shouldn't vrefresh be set already?

 *

 * RETURNS:

 * Vertical refresh rate of @mode x 1000. For precision reasons.

 * Vertical refresh rate. It will be the result of actual value plus 0.5.

 * If it is 70.288, it will return 70Hz.

 * If it is 59.6, it will return 60Hz.

 */

int drm_mode_vrefresh(struct drm_display_mode *mode)

{
@@ -576,14 +578,13 @@ int drm_mode_vrefresh(struct drm_display_mode *mode) 
	if (mode->vrefresh > 0)

		refresh = mode->vrefresh;

	else if (mode->htotal > 0 && mode->vtotal > 0) {

		int vtotal;

		vtotal = mode->vtotal;

		/* work out vrefresh the value will be x1000 */

		calc_val = (mode->clock * 1000);



		calc_val /= mode->htotal;

		calc_val *= 1000;

		calc_val /= mode->vtotal;

		refresh = (calc_val + vtotal / 2) / vtotal;



		refresh = calc_val;

		if (mode->flags & DRM_MODE_FLAG_INTERLACE)

			refresh *= 2;

		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)

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