linux-kernel - Re: [PATCH v3 2/2] drm/tidss: Add support for AM625 DSS

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Message-ID: <cb9ada9f-9673-2039-c22b-fa0d3345fe41@ti.com>
Date:   Tue, 9 Aug 2022 11:38:40 +0530
From:   Aradhya Bhatia <a-bhatia1@...com>
To:     Tomi Valkeinen <tomi.valkeinen@...asonboard.com>,
        Jyri Sarha <jyri.sarha@....fi>,
        Rob Herring <robh+dt@...nel.org>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel@...ll.ch>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>
CC:     Nishanth Menon <nm@...com>,
        Devicetree List <devicetree@...r.kernel.org>,
        Vignesh Raghavendra <vigneshr@...com>,
        Devarsh Thakkar <devarsht@...com>,
        Linux Kernel List <linux-kernel@...r.kernel.org>,
        DRI Development List <dri-devel@...ts.freedesktop.org>,
        Rahul T R <r-ravikumar@...com>
Subject: Re: [PATCH v3 2/2] drm/tidss: Add support for AM625 DSS

Hi Tomi,

On 28-Jul-22 17:34, Tomi Valkeinen wrote:
> On 27/06/2022 18:12, Aradhya Bhatia wrote:
>> Add support for the DSS IP on TI's new AM625 SoC in the tidss driver.
>>
>> Signed-off-by: Aradhya Bhatia <a-bhatia1@...com>
>> Reviewed-by: Rahul T R <r-ravikumar@...com>
>> ---
>>   drivers/gpu/drm/tidss/tidss_dispc.c | 56 ++++++++++++++++++++++++++++-
>>   drivers/gpu/drm/tidss/tidss_dispc.h |  2 ++
>>   drivers/gpu/drm/tidss/tidss_drv.c   |  1 +
>>   3 files changed, 58 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/tidss/tidss_dispc.c 
>> b/drivers/gpu/drm/tidss/tidss_dispc.c
>> index dae47853b728..f084f0688a54 100644
>> --- a/drivers/gpu/drm/tidss/tidss_dispc.c
>> +++ b/drivers/gpu/drm/tidss/tidss_dispc.c
>> @@ -272,6 +272,55 @@ const struct dispc_features dispc_j721e_feats = {
>>       .vid_order = { 1, 3, 0, 2 },
>>   };
>> +const struct dispc_features dispc_am625_feats = {
>> +    .max_pclk_khz = {
>> +        [DISPC_VP_DPI] = 165000,
>> +        [DISPC_VP_OLDI] = 165000,
>> +    },
>> +
>> +    .scaling = {
>> +        .in_width_max_5tap_rgb = 1280,
>> +        .in_width_max_3tap_rgb = 2560,
>> +        .in_width_max_5tap_yuv = 2560,
>> +        .in_width_max_3tap_yuv = 4096,
>> +        .upscale_limit = 16,
>> +        .downscale_limit_5tap = 4,
>> +        .downscale_limit_3tap = 2,
>> +        /*
>> +         * The max supported pixel inc value is 255. The value
>> +         * of pixel inc is calculated like this: 1+(xinc-1)*bpp.
>> +         * The maximum bpp of all formats supported by the HW
>> +         * is 8. So the maximum supported xinc value is 32,
>> +         * because 1+(32-1)*8 < 255 < 1+(33-1)*4.
>> +         */
>> +        .xinc_max = 32,
>> +    },
>> +
>> +    .subrev = DISPC_AM625,
>> +
>> +    .common = "common",
>> +    .common_regs = tidss_am65x_common_regs,
>> +
>> +    .num_vps = 2,
>> +    .vp_name = { "vp1", "vp2" },
>> +    .ovr_name = { "ovr1", "ovr2" },
>> +    .vpclk_name =  { "vp1", "vp2" },
>> +    .vp_bus_type = { DISPC_VP_OLDI, DISPC_VP_DPI },
> 
> This looks correct, but with the two OLDI TXes, I think there will be 
> some interesting issues.
> 
> The tidss_kms.c associates a DSS VP and a DT port, but that's no longer 
> true if you add the ports for both OLDI TXes, as they both use the same 
> VP. I think fixing that won't affect this patch, though, and merging 
> this patch will, afaik, enable similar DSS functionality as we have for 
> AM65x.
> 
> So, I think these two patches could be merged, or we could wait a bit 
> until the OLDI situation becomes more clear. Up to you. In any case, for 
> both patches:
> 
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>\

Thank you for the review!

This patch set is required for the dss DT patches to be upstreamed for
the AM625-SK, so I would like them to get merged.

Since these were posted in the previous merge window, I will re-send 
with your tag.

Regards
Aradhya