[Intel-gfx] [PATCH] drm/i915/mtl: Skip using vbt hdmi_level_shifter selection on MTL

[Jani Nikula]

On Tue, 20 Jun 2023, "Sripada, Radhakrishna" <radhakrishna.sripada at intel.com> wrote:
> Merged. Thank you for the review.

Where are the CI results?

Please never merge patches without CI results.

BR,
Jani.

>
> --Radhakrishna(RK) Sripada
>
>> -----Original Message-----
>> From: Taylor, Clinton A <clinton.a.taylor at intel.com>
>> Sent: Tuesday, June 20, 2023 2:10 PM
>> To: Sripada, Radhakrishna <radhakrishna.sripada at intel.com>; intel-
>> gfx at lists.freedesktop.org
>> Cc: Lee, Shawn C <shawn.c.lee at intel.com>; Almahallawy, Khaled
>> <khaled.almahallawy at intel.com>
>> Subject: Re: [PATCH] drm/i915/mtl: Skip using vbt hdmi_level_shifter selection
>> on MTL
>> 
>> On Fri, 2023-06-16 at 14:00 -0700, Radhakrishna Sripada wrote:
>> > The hdmi_level_shifter part of General Bytes definition in VBT, which was
>> > used for choosing different levels on earlier platforms is now a hidden
>> > optin and shows the default value of 0. The level shifter is now to be
>> > deduced from hdmi_default_entry in  intel_ddi_buf_trans for each phy.
>> >
>> > Skip providing the default hw provided value to force driver to choose hdmi
>> > default entry.
>> >
>> > Bspec: 20124
>> > Cc: Khaled Almahallawy <khaled.almahallawy at intel.com>
>> > Cc: Lee Shawn C <shawn.c.lee at intel.com>
>> > Cc: Clint Taylor <Clinton.A.Taylor at intel.com>
>> > Signed-off-by: Radhakrishna Sripada <radhakrishna.sripada at intel.com>
>> > ---
>> >  drivers/gpu/drm/i915/display/intel_bios.c | 3 ++-
>> >  1 file changed, 2 insertions(+), 1 deletion(-)
>> >
>> > diff --git a/drivers/gpu/drm/i915/display/intel_bios.c
>> > b/drivers/gpu/drm/i915/display/intel_bios.c
>> > index 34a397adbd6b..4b9bf76e137d 100644
>> > --- a/drivers/gpu/drm/i915/display/intel_bios.c
>> > +++ b/drivers/gpu/drm/i915/display/intel_bios.c
>> > @@ -2615,7 +2615,8 @@ intel_bios_encoder_is_lspcon(const struct
>> intel_bios_encoder_data
>> > *devdata)
>> >  /* This is an index in the HDMI/DVI DDI buffer translation table, or -1 */
>> >  int intel_bios_hdmi_level_shift(const struct intel_bios_encoder_data
>> *devdata)
>> >  {
>> > -	if (!devdata || devdata->i915->display.vbt.version < 158)
>> > +	if (!devdata || devdata->i915->display.vbt.version < 158 ||
>> > +	    DISPLAY_VER(devdata->i915) >= 14)
>> >  		return -1;
>> >
>> Reviewed-by: Clint Taylor <Clinton.A.Taylor at intel.com>
>> 
>> -Clint
>> 
>> >  	return devdata->child.hdmi_level_shifter_value;

-- 
Jani Nikula, Intel Open Source Graphics Center