[PATCH] drm/edid : cache edid range limits in drm connector
Jani Nikula
jani.nikula at linux.intel.com
Wed May 4 07:10:39 UTC 2016
On Wed, 04 May 2016, "Prosyak, Vitaly" <Vitaly.Prosyak at amd.com> wrote:
> We are going to use min/max vertical refresh rate when enter/exit to
> the dynamic refresh rate mode ,it is known as 'freesync', enter/exit
> to full screen games.
As Daniel said, we should see the patch using them too. It's hard to say
whether this is the right thing to do otherwise.
BR,
Jani.
> Right , we may have a helper function which extracts these properties and store wherever need it.
> But this an alternative solution with additional helper adds some code duplication into drm_edid.c since the case already present in the code:
> case 0x01: /* just the ranges, no formula */ Also these values are parsed during each mode enumeration.
>
> Why I put into connector:
> Drm connector have already similar items from EDID: drm_tile_group ,etc...
>
> Vitaly
> -----Original Message-----.
>
> From: Daniel Vetter [mailto:daniel.vetter at ffwll.ch] On Behalf Of Daniel Vetter
> Sent: Tuesday, May 03, 2016 4:24 PM
> To: Prosyak, Vitaly
> Cc: dri-devel at lists.freedesktop.org
> Subject: Re: [PATCH] drm/edid : cache edid range limits in drm connector
>
> On Tue, May 03, 2016 at 11:05:24AM -0400, Vitaly Prosyak wrote:
>> Cache in drm connector the edid range limits properties:
>> min/max vertical refresh rates and max pixel clock.
>> It would be used when enter to drr mode.
>>
>> Signed-off-by: Vitaly Prosyak <vitaly.prosyak at amd.com>
>
> Where's the patches that will use this? It might make sense to instead have some helper functions to compute these values, so that drivers can store them wherever they want/need. But impossible to tell without the users of this stuff.
> -Daniel
>
>> ---
>> drivers/gpu/drm/drm_edid.c | 11 +++++++++++
>> include/drm/drm_crtc.h | 5 +++++
>> 2 files changed, 16 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/drm_edid.c b/drivers/gpu/drm/drm_edid.c
>> index 04cb487..7e49962 100644
>> --- a/drivers/gpu/drm/drm_edid.c
>> +++ b/drivers/gpu/drm/drm_edid.c
>> @@ -2190,6 +2190,17 @@ do_inferred_modes(struct detailed_timing *timing, void *c)
>> timing);
>> break;
>> case 0x01: /* just the ranges, no formula */
>> + closure->connector->min_vfreq = range->min_vfreq;
>> + closure->connector->max_vfreq = range->max_vfreq;
>> + if (closure->edid->revision >= 4) {
>> + if ((range->flags & 0x03) == 0x3)
>> + closure->connector->min_vfreq += 255;
>> + if (range->flags & 0x02)
>> + closure->connector->max_vfreq += 255;
>> + }
>> + closure->connector->max_pixel_clock_khz =
>> + range_pixel_clock(closure->edid, (u8 *)timing);
>> + break;
>> default:
>> break;
>> }
>> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h index
>> c5b4b81..85fc554 100644
>> --- a/include/drm/drm_crtc.h
>> +++ b/include/drm/drm_crtc.h
>> @@ -1230,6 +1230,11 @@ struct drm_connector {
>> uint8_t num_h_tile, num_v_tile;
>> uint8_t tile_h_loc, tile_v_loc;
>> uint16_t tile_h_size, tile_v_size;
>> +
>> + /*EDID range limits for drr*/
>> + int min_vfreq ;
>> + int max_vfreq ;
>> + int max_pixel_clock_khz;
>> };
>>
>> /**
>> --
>> 1.9.1
>>
>> _______________________________________________
>> dri-devel mailing list
>> dri-devel at lists.freedesktop.org
>> https://lists.freedesktop.org/mailman/listinfo/dri-devel
>
> --
> Daniel Vetter
> Software Engineer, Intel Corporation
> http://blog.ffwll.ch
> _______________________________________________
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> dri-devel at lists.freedesktop.org
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--
Jani Nikula, Intel Open Source Technology Center
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