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authorLee, Shawn C <shawn.c.lee@intel.com>2018-09-12 09:22:50 +0300
committerJani Nikula <jani.nikula@intel.com>2018-09-19 16:44:12 +0300
commit53ca2edcf033f3368b2dc0ef3cbcc2f47d556d13 (patch)
treec7a8b6e2c93bb03c8cd5b4d3eb5b68e2154a3fe0 /include/drm
parent0b49bbbd9f10dd5bcce126aa99041a44320767f7 (diff)
downloadlinux-53ca2edcf033f3368b2dc0ef3cbcc2f47d556d13.tar.xz
drm: Change limited M/N quirk to constant N quirk.
Some DP dongles in particular seem to be fussy about too large link M/N values. Set specific value for N divider can resolve this issue per dongle vendor's comment. So configure N as constant value (0x8000) to instead of reduce M/N formula when specific DP dongle connected. v2: add more comments for issue description and fix typo. v3: add lost commit messages back for version 2 v4: send patch to both intel-gfx and dri-devel Cc: Jani Nikula <jani.nikula@intel.com> Cc: Cooper Chiou <cooper.chiou@intel.com> Cc: Matt Atwood <matthew.s.atwood@intel.com> Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com> Cc: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com> Cc: Clint Taylor <clinton.a.taylor@intel.com> Tested-by: Clint Taylor <clinton.a.taylor@intel.com> Signed-off-by: Lee, Shawn C <shawn.c.lee@intel.com> Signed-off-by: Jani Nikula <jani.nikula@intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/1536733371-25004-3-git-send-email-shawn.c.lee@intel.com
Diffstat (limited to 'include/drm')
-rw-r--r--include/drm/drm_dp_helper.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 698082a02b97..2a3843f248cf 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1261,12 +1261,12 @@ int drm_dp_read_desc(struct drm_dp_aux *aux, struct drm_dp_desc *desc,
*/
enum drm_dp_quirk {
/**
- * @DP_DPCD_QUIRK_LIMITED_M_N:
+ * @DP_DPCD_QUIRK_CONSTANT_N:
*
* The device requires main link attributes Mvid and Nvid to be limited
- * to 16 bits.
+ * to 16 bits. So will give a constant value (0x8000) for compatability.
*/
- DP_DPCD_QUIRK_LIMITED_M_N,
+ DP_DPCD_QUIRK_CONSTANT_N,
};
/**