On Mon, 10 Sep 2018, "Lee, Shawn C" <shawn.c....@intel.com> wrote:
> The N value was computed by kernel driver that based on synchronous clock
> mode. But only specific N value (0x8000) would be acceptable for
> LG LP140WF6-SPM1 eDP panel which is running at asynchronous clock mode.
> With the other N value, Tcon will enter BITS mode and display black screen.
> Add this panel into quirk database and give particular N value when
> calculate M/N divider.
>
> Cc: Jani Nikula <jani.nik...@intel.com>
> Cc: Cooper Chiou <cooper.ch...@intel.com>
> Cc: Matt Atwood <matthew.s.atw...@intel.com>
> Cc: Maarten Lankhorst <maarten.lankho...@linux.intel.com>
> Cc: Dhinakaran Pandiyan <dhinakaran.pandi...@intel.com>
> Cc: Clint Taylor <clinton.a.tay...@intel.com>
> Signed-off-by: Lee, Shawn C <shawn.c....@intel.com>
No access to the panel or its details, so instead of review,
Acked-by: Jani Nikula <jani.nik...@intel.com>
> ---
> drivers/gpu/drm/drm_dp_helper.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index d0c1250975ab..0ef7c43a9025 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -1270,6 +1270,8 @@ struct dpcd_quirk {
> static const struct dpcd_quirk dpcd_quirk_list[] = {
> /* Analogix 7737 needs reduced M and N at HBR2 link rates */
> { OUI(0x00, 0x22, 0xb9), DEVICE_ID_ANY, true,
> BIT(DP_DPCD_QUIRK_CONSTANT_N) },
> + /* LG LP140WF6-SPM1 eDP panel */
> + { OUI(0x00, 0x22, 0xb9), DEVICE_ID('s', 'i', 'v', 'a', 'r', 'T'),
> false, BIT(DP_DPCD_QUIRK_CONSTANT_N) },
> };
>
> #undef OUI
--
Jani Nikula, Intel Open Source Graphics Center
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