linux-kernel - Re: [PATCH 3/5] drm/msm: mdss: Add X1E80100 support

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Message-ID: <66ecb179-a878-bfe0-af8d-0640560e0a9b@quicinc.com>
Date: Thu, 8 Feb 2024 08:59:43 -0800
From: Abhinav Kumar <quic_abhinavk@...cinc.com>
To: Abel Vesa <abel.vesa@...aro.org>,
        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>, Daniel Vetter <daniel@...ll.ch>,
        Maarten Lankhorst
	<maarten.lankhorst@...ux.intel.com>,
        Maxime Ripard <mripard@...nel.org>,
        Thomas Zimmermann <tzimmermann@...e.de>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Conor Dooley
	<conor+dt@...nel.org>,
        Neil Armstrong <neil.armstrong@...aro.org>,
        <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <devicetree@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 3/5] drm/msm: mdss: Add X1E80100 support



On 2/8/2024 5:46 AM, Abel Vesa wrote:
> On 24-02-08 15:42:04, Dmitry Baryshkov wrote:
>> On Thu, 8 Feb 2024 at 15:37, Abel Vesa <abel.vesa@...aro.org> wrote:
>>>
>>> On 24-01-29 17:11:25, Dmitry Baryshkov wrote:
>>>> On Mon, 29 Jan 2024 at 15:19, Abel Vesa <abel.vesa@...aro.org> wrote:
>>>>>
>>>>> Add support for MDSS on X1E80100.
>>>>>
>>>>> Signed-off-by: Abel Vesa <abel.vesa@...aro.org>
>>>>> ---
>>>>>   drivers/gpu/drm/msm/msm_mdss.c | 10 ++++++++++
>>>>>   1 file changed, 10 insertions(+)
>>>>>
>>>>> diff --git a/drivers/gpu/drm/msm/msm_mdss.c b/drivers/gpu/drm/msm/msm_mdss.c
>>>>> index 455b2e3a0cdd..eddf7fdbb60a 100644
>>>>> --- a/drivers/gpu/drm/msm/msm_mdss.c
>>>>> +++ b/drivers/gpu/drm/msm/msm_mdss.c
>>>>> @@ -564,6 +564,15 @@ static const struct msm_mdss_data sdm670_data = {
>>>>>          .highest_bank_bit = 1,
>>>>>   };
>>>>>
>>>>> +static const struct msm_mdss_data x1e80100_data = {
>>>>> +       .ubwc_enc_version = UBWC_4_0,
>>>>> +       .ubwc_dec_version = UBWC_4_3,
>>>>> +       .ubwc_swizzle = 6,
>>>>> +       .ubwc_static = 1,
>>>>> +       .highest_bank_bit = 2,
>>>>> +       .macrotile_mode = 1,
>>>>
>>>> Missing .reg_bus_bw, LGTM otherwise
>>>
>>> Dmitry, I do not have the exact value yet.
>>>
>>> Can I come back with a subsequent (different) patch to add it at a later stage
>>> when I have that information?
>>>
>>> I see no point in holding display support any further since it works
>>> fine with the default bandwith.
>>>
>>> If yes, I'll respin this series right away, but without the reg_bus_bw.
>>
>> Please add a TODO or FIXME comment there.
> 
> Sure thing. Thanks.
> 

I have not heard back from the clock team on the values.

But, what I can confirm at this point is for basic functional display 
support, we could let it go back to the default value which we have 
hard-coded and fill up this entry later.

>>
>>>
>>>>
>>>>> +};
>>>>> +
>>>>>   static const struct msm_mdss_data sdm845_data = {
>>>>>          .ubwc_enc_version = UBWC_2_0,
>>>>>          .ubwc_dec_version = UBWC_2_0,
>>>>> @@ -655,6 +664,7 @@ static const struct of_device_id mdss_dt_match[] = {
>>>>>          { .compatible = "qcom,sm8450-mdss", .data = &sm8350_data },
>>>>>          { .compatible = "qcom,sm8550-mdss", .data = &sm8550_data },
>>>>>          { .compatible = "qcom,sm8650-mdss", .data = &sm8550_data},
>>>>> +       { .compatible = "qcom,x1e80100-mdss", .data = &x1e80100_data},
>>>>>          {}
>>>>>   };
>>>>>   MODULE_DEVICE_TABLE(of, mdss_dt_match);
>>>>>
>>>>> --
>>>>> 2.34.1
>>>>>
>>>>
>>>>
>>>> --
>>>> With best wishes
>>>> Dmitry
>>
>>
>>
>> -- 
>> With best wishes
>> Dmitry