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Commit c09dedb7 authored by Takashi Iwai's avatar Takashi Iwai Committed by Dave Airlie
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drm/edid: Add a workaround for 1366x768 HD panel 



HD panel (1366x768) found most commonly on laptops can't be represented
exactly in CVT/DMT expression, which leads to 1368x768 instead, because
1366 can't be divided by 8.

Add a hack to convert to 1366x768 manually as an exception.

Signed-off-by: default avatarTakashi Iwai <tiwai@suse.de>
Acked-by: default avatarAdam Jackson <ajax@redhat.com>
Signed-off-by: default avatarDave Airlie <airlied@redhat.com>
parent 02809179

drivers/gpu/drm/drm_edid.c

+15 −0
Original line number Diff line number Diff line
@@ -1039,6 +1039,19 @@ drm_dmt_modes_for_range(struct drm_connector *connector, struct edid *edid, 
	return modes;

}



/* fix up 1366x768 mode from 1368x768;

 * GFT/CVT can't express 1366 width which isn't dividable by 8

 */

static void fixup_mode_1366x768(struct drm_display_mode *mode)

{

	if (mode->hdisplay == 1368 && mode->vdisplay == 768) {

		mode->hdisplay = 1366;

		mode->hsync_start--;

		mode->hsync_end--;

		drm_mode_set_name(mode);

	}

}



static int

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

			struct detailed_timing *timing)
@@ -1053,6 +1066,7 @@ drm_gtf_modes_for_range(struct drm_connector *connector, struct edid *edid, 
		if (!newmode)

			return modes;



		fixup_mode_1366x768(newmode);

		if (!mode_in_range(newmode, edid, timing)) {

			drm_mode_destroy(dev, newmode);

			continue;
@@ -1080,6 +1094,7 @@ drm_cvt_modes_for_range(struct drm_connector *connector, struct edid *edid, 
		if (!newmode)

			return modes;



		fixup_mode_1366x768(newmode);

		if (!mode_in_range(newmode, edid, timing)) {

			drm_mode_destroy(dev, newmode);

			continue;