From: Takashi Iwai Date: Mon, 23 Apr 2012 16:40:33 +0000 (+0100) Subject: drm/edid: Add a workaround for 1366x768 HD panel X-Git-Tag: firefly_0821_release~3680^2~2315^2~90 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=c09dedb7a50e23f0166e0bbae61c75c7ec23cf7f;p=firefly-linux-kernel-4.4.55.git 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 Acked-by: Adam Jackson Signed-off-by: Dave Airlie --- diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c index bad2f11aa224..c6366e90041e 100644 --- a/drivers/gpu/drm/drm_edid.c +++ b/drivers/gpu/drm/drm_edid.c @@ -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;