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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: Takashi Iwai <tiwai@suse.de>
Acked-by: Adam Jackson <ajax@redhat.com>
Signed-off-by: Dave Airlie <airlied@redhat.com>
hifive-unleashed-5.1
Takashi Iwai 2012-04-23 17:40:33 +01:00 committed by Dave Airlie
parent 02809179bb
commit c09dedb7a5
1 changed files with 15 additions and 0 deletions
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15
drivers/gpu/drm/drm_edid.c
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@ -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;