* [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA
@ 2018-02-18 8:53 Kai-Heng Feng
2018-02-18 12:17 ` Mario Kleiner
2018-02-19 10:42 ` Jani Nikula
0 siblings, 2 replies; 3+ messages in thread
From: Kai-Heng Feng @ 2018-02-18 8:53 UTC (permalink / raw)
To: airlied
Cc: mario.kleiner.de, daniel.vetter, gustavo, seanpaul, dri-devel,
linux-kernel, Kai-Heng Feng
Similar to commit e10aec652f31 ("drm/edid: Add 6 bpc quirk for display
AEO model 0."), the EDID reports "DFP 1.x compliant TMDS" but it support
6bpc instead of 8 bpc.
Hence, use 6 bpc quirk for this panel.
Fixes: 196f954e2509 ("drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"")
BugLink: https://bugs.launchpad.net/bugs/1749420
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
drivers/gpu/drm/drm_edid.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
index ddd537914575..d9c8d718e261 100644
--- a/drivers/gpu/drm/drm_edid.c
+++ b/drivers/gpu/drm/drm_edid.c
@@ -113,6 +113,9 @@ static const struct edid_quirk {
/* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
{ "AEO", 0, EDID_QUIRK_FORCE_6BPC },
+ /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
+ { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
+
/* Belinea 10 15 55 */
{ "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
{ "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
--
2.15.1
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA
2018-02-18 8:53 [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA Kai-Heng Feng
@ 2018-02-18 12:17 ` Mario Kleiner
2018-02-19 10:42 ` Jani Nikula
1 sibling, 0 replies; 3+ messages in thread
From: Mario Kleiner @ 2018-02-18 12:17 UTC (permalink / raw)
To: Kai-Heng Feng, airlied
Cc: daniel.vetter, gustavo, seanpaul, dri-devel, linux-kernel
On 02/18/2018 09:53 AM, Kai-Heng Feng wrote:
> Similar to commit e10aec652f31 ("drm/edid: Add 6 bpc quirk for display
> AEO model 0."), the EDID reports "DFP 1.x compliant TMDS" but it support
> 6bpc instead of 8 bpc.
>
> Hence, use 6 bpc quirk for this panel.
>
> Fixes: 196f954e2509 ("drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"")
> BugLink: https://bugs.launchpad.net/bugs/1749420
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> drivers/gpu/drm/drm_edid.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index ddd537914575..d9c8d718e261 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -113,6 +113,9 @@ static const struct edid_quirk {
> /* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
> { "AEO", 0, EDID_QUIRK_FORCE_6BPC },
>
> + /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
> + { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
> +
> /* Belinea 10 15 55 */
> { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
> { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
>
Reviewed-by: Mario Kleiner <mario.kleiner.de@gmail.com>
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA
2018-02-18 8:53 [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA Kai-Heng Feng
2018-02-18 12:17 ` Mario Kleiner
@ 2018-02-19 10:42 ` Jani Nikula
1 sibling, 0 replies; 3+ messages in thread
From: Jani Nikula @ 2018-02-19 10:42 UTC (permalink / raw)
To: Kai-Heng Feng, airlied
Cc: linux-kernel, dri-devel, Kai-Heng Feng, daniel.vetter
On Sun, 18 Feb 2018, Kai-Heng Feng <kai.heng.feng@canonical.com> wrote:
> Similar to commit e10aec652f31 ("drm/edid: Add 6 bpc quirk for display
> AEO model 0."), the EDID reports "DFP 1.x compliant TMDS" but it support
> 6bpc instead of 8 bpc.
>
> Hence, use 6 bpc quirk for this panel.
>
> Fixes: 196f954e2509 ("drm/i915/dp: Revert "drm/i915/dp: fall back to 18 bpp when sink capability is unknown"")
Implies
Cc: <stable@vger.kernel.org> # v4.8+
> BugLink: https://bugs.launchpad.net/bugs/1749420
> Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
> ---
> drivers/gpu/drm/drm_edid.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
> index ddd537914575..d9c8d718e261 100644
> --- a/drivers/gpu/drm/drm_edid.c
> +++ b/drivers/gpu/drm/drm_edid.c
> @@ -113,6 +113,9 @@ static const struct edid_quirk {
> /* AEO model 0 reports 8 bpc, but is a 6 bpc panel */
> { "AEO", 0, EDID_QUIRK_FORCE_6BPC },
>
> + /* CPT panel of Asus UX303LA reports 8 bpc, but is a 6 bpc panel */
> + { "CPT", 0x17df, EDID_QUIRK_FORCE_6BPC },
> +
> /* Belinea 10 15 55 */
> { "MAX", 1516, EDID_QUIRK_PREFER_LARGE_60 },
> { "MAX", 0x77e, EDID_QUIRK_PREFER_LARGE_60 },
--
Jani Nikula, Intel Open Source Technology Center
^ permalink raw reply [flat|nested] 3+ messages in thread
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2018-02-18 8:53 [PATCH] drm/edid: Add 6 bpc quirk for CPT panel in Asus UX303LA Kai-Heng Feng
2018-02-18 12:17 ` Mario Kleiner
2018-02-19 10:42 ` Jani Nikula
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