linux-kernel - Re: [PATCH v4 06/16] drm/msm/dp: split MMSS_DP_DSC_DTO register write to a separate function

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Message-ID: <571e6fd5-11bc-40f7-9b82-48a045c7447a@quicinc.com>
Date: Mon, 16 Dec 2024 15:38:43 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
CC: Rob Clark <robdclark@...il.com>, Sean Paul <sean@...rly.run>,
        "Marijn
 Suijten" <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Paloma Arellano <quic_parellan@...cinc.com>,
        Douglas Anderson <dianders@...omium.org>,
        Stephen Boyd <swboyd@...omium.org>, <linux-arm-msm@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <freedreno@...ts.freedesktop.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v4 06/16] drm/msm/dp: split MMSS_DP_DSC_DTO register write
 to a separate function



On 12/16/2024 2:24 PM, Dmitry Baryshkov wrote:
> On Mon, Dec 16, 2024 at 11:46:21AM -0800, Abhinav Kumar wrote:
>>
>>
>> On 12/15/2024 2:44 PM, Dmitry Baryshkov wrote:
>>> It's the dp_panel's duty to clear the MMSS_DP_DSC_DTO register. Once DP
>>> driver gets DSC support, it will handle that register in other places
>>> too. Split a call to write 0x0 to that register to a separate function.
>>>
>>> Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
>>> ---
>>>    drivers/gpu/drm/msm/dp/dp_catalog.c | 8 ++++++++
>>>    drivers/gpu/drm/msm/dp/dp_catalog.h | 2 ++
>>>    drivers/gpu/drm/msm/dp/dp_ctrl.c    | 2 ++
>>>    3 files changed, 12 insertions(+)
>>>
>>> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.c b/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> index 7b7eadb2f83b169d8df27ee93589abe05b38f3ae..354ec834f9357c4797fc08a4532e69acc67b4317 100644
>>> --- a/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.c
>>> @@ -1039,6 +1039,14 @@ void msm_dp_catalog_panel_tpg_disable(struct msm_dp_catalog *msm_dp_catalog)
>>>    	msm_dp_write_p0(catalog, MMSS_DP_TIMING_ENGINE_EN, 0x0);
>>>    }
>>> +void msm_dp_catalog_panel_clear_dsc_dto(struct msm_dp_catalog *msm_dp_catalog)
>>> +{
>>> +	struct msm_dp_catalog_private *catalog = container_of(msm_dp_catalog,
>>> +				struct msm_dp_catalog_private, msm_dp_catalog);
>>> +
>>> +	msm_dp_write_p0(catalog, MMSS_DP_DSC_DTO, 0x0);
>>> +}
>>
>> This is already done msm_dp_catalog_ctrl_config_msa(), this is either a
>> duplicate or redundant.
>>
>> void msm_dp_catalog_ctrl_config_msa(..........)
>> {
>> 	**********
>>          msm_dp_write_link(catalog, REG_DP_SOFTWARE_NVID, nvid);
>>          msm_dp_write_p0(catalog, MMSS_DP_DSC_DTO, 0x0);
>> }
> 
> The chunk to remove it got squashed into a different patch.
> 

hmm, if you would indeed like it to be a separate API , the removal from 
the above chunk should go together in the same patch otherwise it looks 
redundant.

>>
>>> +
>>>    static void __iomem *msm_dp_ioremap(struct platform_device *pdev, int idx, size_t *len)
>>>    {
>>>    	struct resource *res;
>>> diff --git a/drivers/gpu/drm/msm/dp/dp_catalog.h b/drivers/gpu/drm/msm/dp/dp_catalog.h
>>> index 6678b0ac9a67881244884d59487fa288d33d1be7..08bb42e91b779633875dbeb4130bc55a6571cfb1 100644
>>> --- a/drivers/gpu/drm/msm/dp/dp_catalog.h
>>> +++ b/drivers/gpu/drm/msm/dp/dp_catalog.h
>>> @@ -92,6 +92,8 @@ void msm_dp_catalog_panel_tpg_enable(struct msm_dp_catalog *msm_dp_catalog,
>>>    				struct drm_display_mode *drm_mode);
>>>    void msm_dp_catalog_panel_tpg_disable(struct msm_dp_catalog *msm_dp_catalog);
>>> +void msm_dp_catalog_panel_clear_dsc_dto(struct msm_dp_catalog *msm_dp_catalog);
>>> +
>>>    struct msm_dp_catalog *msm_dp_catalog_get(struct device *dev);
>>>    /* DP Audio APIs */
>>> diff --git a/drivers/gpu/drm/msm/dp/dp_ctrl.c b/drivers/gpu/drm/msm/dp/dp_ctrl.c
>>> index 9c463ae2f8fae916661fef1c7e225f55c1026478..b9c461fee96f8fae9259ce03a32e1155b42d17bb 100644
>>> --- a/drivers/gpu/drm/msm/dp/dp_ctrl.c
>>> +++ b/drivers/gpu/drm/msm/dp/dp_ctrl.c
>>> @@ -2011,6 +2011,8 @@ int msm_dp_ctrl_on_stream(struct msm_dp_ctrl *msm_dp_ctrl, bool force_link_train
>>>    		pixel_rate_orig,
>>>    		ctrl->panel->msm_dp_mode.out_fmt_is_yuv_420);
>>> +	msm_dp_catalog_panel_clear_dsc_dto(ctrl->catalog);
>>> +
>>>    	msm_dp_ctrl_setup_tr_unit(ctrl);
>>>    	msm_dp_catalog_ctrl_state_ctrl(ctrl->catalog, DP_STATE_CTRL_SEND_VIDEO);
>>>
>