Thanks Ville,
I'll backport your patch (drm/i915/vbt: Fix HDMI level shifter and max data
rate bitfield sizes) to CrOS kernel for resolving this issue. Please abandon my
patch.
Best Regards,
Cooper
___
Intel-gfx mailing list
On Wed, Apr 10, 2019 at 11:32:47AM +, Chiou, Cooper wrote:
> Hi Ville,
>
>
>
> From BSpec define, HDMI max data rate is “Bits 5-7” not Bits 4-7. And the
> following image is what I captured by latest VBT BMP v2.67 tool to load GLK
> VBT bin file and changed HDMI_MAX_TMDS_Bit_Rate field in
ernel: [0.172369] Missing switch case (4) in parse_ddi_port
>
>
>
> Best Regards,
>
> Cooper
>
> +886-2-6622-1166
>
>
>
>
>
> -----Original Message-
> From: Ville Syrjälä [mailto:ville.syrj...@linux.intel.com]
> Sent: Tuesday, April
6622-1166
-Original Message-
From: Ville Syrjälä [mailto:ville.syrj...@linux.intel.com]
Sent: Tuesday, April 9, 2019 23:57 PM
To: Chiou, Cooper
Cc: intel-gfx@lists.freedesktop.org; Nikula, Jani ;
ch...@freedesktop.org
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Update HDMI max TMDS data
On Tue, Apr 09, 2019 at 03:46:20PM +, Chiou, Cooper wrote:
> Hi Ville,
>
> The bits is 5-7 means it’s 001x for 2.97Gbps, and 010x for 1.65Gbps.
> So correct value should be 2 not 1 for HDMI_MAX_DATA_RATE_297.
No. The bitfield is defined as something:3.
> And HDMI_MAX_DATA_RATE_165
Hi Ville,
The bits is 5-7 means it’s 001x for 2.97Gbps, and 010x for 1.65Gbps.
So correct value should be 2 not 1 for HDMI_MAX_DATA_RATE_297.
And HDMI_MAX_DATA_RATE_165 is 4 not 2.
I checked kernel i915 log and modified VBT to limit HDMI 1.4 from HDMI 2.0 then
found this error. And I
On Tue, Apr 09, 2019 at 06:07:08PM +0800, Chiou, Cooper wrote:
> VBT version 212 defined HDMI max. bit-rate 2.97Gbps is 0x02 and 1.65Gbps
> is 0x04, so changed HDMI_MAX_DATA_RATE_297/HDMI_MAX_DATA_RATE_165 to map
> correct values
Eh what? Did someone just change the interpretation of these
VBT version 212 defined HDMI max. bit-rate 2.97Gbps is 0x02 and 1.65Gbps
is 0x04, so changed HDMI_MAX_DATA_RATE_297/HDMI_MAX_DATA_RATE_165 to map
correct values
Per VBT BSpec definition in HDMI max. data rate, Bits7-5 is HDMI max. data
rate 000=Default, 001=2.97Gbps, 010=1.65Gbps, so
