linux-kernel - Re: [PATCH v2 05/16] drm/msm/dpu: add cdm blocks to sc7280 dpu_hw

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Message-ID: <ab69ba1e-3108-c2f0-27be-f1fd5d11bc82@quicinc.com>
Date:   Mon, 11 Dec 2023 13:48:17 -0800
From:   Abhinav Kumar <quic_abhinavk@...cinc.com>
To:     Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC:     Sean Paul <sean@...rly.run>, <linux-arm-msm@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        Rob Clark <robdclark@...il.com>, <quic_parellan@...cinc.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        <quic_jesszhan@...cinc.com>, David Airlie <airlied@...il.com>,
        <freedreno@...ts.freedesktop.org>
Subject: Re: [PATCH v2 05/16] drm/msm/dpu: add cdm blocks to sc7280
 dpu_hw_catalog



On 12/11/2023 1:42 PM, Dmitry Baryshkov wrote:
> On Mon, 11 Dec 2023 at 23:32, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>>
>>
>>
>> On 12/11/2023 1:31 PM, Dmitry Baryshkov wrote:
>>> On Mon, 11 Dec 2023 at 23:16, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>>>>
>>>>
>>>>
>>>> On 12/8/2023 3:19 AM, Dmitry Baryshkov wrote:
>>>>> On Fri, 8 Dec 2023 at 07:07, Abhinav Kumar <quic_abhinavk@...cinc.com> wrote:
>>>>>>
>>>>>> Add CDM blocks to the sc7280 dpu_hw_catalog to support
>>>>>> YUV format output from writeback block.
>>>>>>
>>>>>> changes in v2:
>>>>>>            - remove explicit zero assignment for features
>>>>>>            - move sc7280_cdm to dpu_hw_catalog from the sc7280
>>>>>>              catalog file as its definition can be re-used
>>>>>>
>>>>>> Signed-off-by: Abhinav Kumar <quic_abhinavk@...cinc.com>
>>>>>> ---
>>>>>>     .../gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h  |  1 +
>>>>>>     drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c      | 10 ++++++++++
>>>>>>     drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h      | 13 +++++++++++++
>>>>>>     drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h         |  5 +++++
>>>>>>     4 files changed, 29 insertions(+)
>>>>>>
>>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h
>>>>>> index 209675de6742..19c2b7454796 100644
>>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h
>>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/catalog/dpu_7_2_sc7280.h
>>>>>> @@ -248,6 +248,7 @@ const struct dpu_mdss_cfg dpu_sc7280_cfg = {
>>>>>>            .mdss_ver = &sc7280_mdss_ver,
>>>>>>            .caps = &sc7280_dpu_caps,
>>>>>>            .mdp = &sc7280_mdp,
>>>>>> +       .cdm = &sc7280_cdm,
>>>>>>            .ctl_count = ARRAY_SIZE(sc7280_ctl),
>>>>>>            .ctl = sc7280_ctl,
>>>>>>            .sspp_count = ARRAY_SIZE(sc7280_sspp),
>>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>>> index d52aae54bbd5..1be3156cde05 100644
>>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
>>>>>> @@ -426,6 +426,16 @@ static const struct dpu_dsc_sub_blks dsc_sblk_1 = {
>>>>>>            .ctl = {.name = "ctl", .base = 0xF80, .len = 0x10},
>>>>>>     };
>>>>>>
>>>>>> +/*************************************************************
>>>>>> + * CDM sub block config
>>>>>
>>>>> Nit: it is not a subblock config.
>>>>>
>>>>
>>>> Ack.
>>>>
>>>>>> + *************************************************************/
>>>>>> +static const struct dpu_cdm_cfg sc7280_cdm = {
>>>>>
>>>>> I know that I have r-b'ed this patch. But then one thing occurred to
>>>>> me. If this definition is common to all (or almost all) platforms, can
>>>>> we just call it dpu_cdm or dpu_common_cdm?
>>>>>
>>>>>> +       .name = "cdm_0",
>>>>>> +       .id = CDM_0,
>>>>>> +       .len = 0x228,
>>>>>> +       .base = 0x79200,
>>>>>> +};
>>>>
>>>> hmmm .... almost common but not entirely ... msm8998's CDM has a shorter
>>>> len of 0x224 :(
>>>
>>> Then sdm845_cdm?
>>>
>>
>> That also has a shorter cdm length.
> 
> Could you please clarify. According to the downstream DT files all CDM
> blocks up to (but not including) sm8550 had length 0x224. SM8550 and
> SM8650 got qcom,sde-cdm-size = <0x220>.  But I don't see any registers
> after 0x204.
>>

We always list 0x4 more than the last offset.

In chipsets sdm845 and msm8998, I only see the last offset of CDM as 
0x220 but in sm8250 and sc7280, the last offset is 0x224. Hence the 
total length is more in sc7280/sm8250 as compared to sdm845/msm8998.

I didnt follow that you do not see any registers after 0x204.

The CDM_MUX is the last offset which has an offset 0x224 from the base 
address. So thats the last offset.

The newer chipsets have CDM_MUX and the older ones did not. Hence the 
difference in length.

>> BTW, sdm845 is not in this series. It will be part of RFT as we discussed.
>>
>>>>
>>>>>> +
>>>>>>     /*************************************************************
>>>>>>      * VBIF sub blocks config
>>>>>>      *************************************************************/
>>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>>>>> index e3c0d007481b..ba82ef4560a6 100644
>>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
>>>>>> @@ -682,6 +682,17 @@ struct dpu_vbif_cfg {
>>>>>>            u32 memtype[MAX_XIN_COUNT];
>>>>>>     };
>>>>>>
>>>>>> +/**
>>>>>> + * struct dpu_cdm_cfg - information of chroma down blocks
>>>>>> + * @name               string name for debug purposes
>>>>>> + * @id                 enum identifying this block
>>>>>> + * @base               register offset of this block
>>>>>> + * @features           bit mask identifying sub-blocks/features
>>>>>> + */
>>>>>> +struct dpu_cdm_cfg {
>>>>>> +       DPU_HW_BLK_INFO;
>>>>>> +};
>>>>>> +
>>>>>>     /**
>>>>>>      * Define CDP use cases
>>>>>>      * @DPU_PERF_CDP_UDAGE_RT: real-time use cases
>>>>>> @@ -805,6 +816,8 @@ struct dpu_mdss_cfg {
>>>>>>            u32 wb_count;
>>>>>>            const struct dpu_wb_cfg *wb;
>>>>>>
>>>>>> +       const struct dpu_cdm_cfg *cdm;
>>>>>> +
>>>>>>            u32 ad_count;
>>>>>>
>>>>>>            u32 dspp_count;
>>>>>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
>>>>>> index a6702b2bfc68..f319c8232ea5 100644
>>>>>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
>>>>>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_mdss.h
>>>>>> @@ -185,6 +185,11 @@ enum dpu_dsc {
>>>>>>            DSC_MAX
>>>>>>     };
>>>>>>
>>>>>> +enum dpu_cdm {
>>>>>> +       CDM_0 = 1,
>>>>>> +       CDM_MAX
>>>>>> +};
>>>>>> +
>>>>>>     enum dpu_pingpong {
>>>>>>            PINGPONG_NONE,
>>>>>>            PINGPONG_0,
>>>>>> --
>>>>>> 2.40.1
>>>>>>
>>>>>
>>>>>
>>>
>>>
>>>
> 
> 
>