linux-kernel - Re: [PATCH RFC 1/3] drm/msm/adreno: Add support for ACD

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Message-ID: <43404449-1830-4651-a85a-54404b1d35bc@quicinc.com>
Date: Wed, 6 Nov 2024 07:14:27 +0530
From: Akhil P Oommen <quic_akhilpo@...cinc.com>
To: <neil.armstrong@...aro.org>, Rob Clark <robdclark@...il.com>,
        Sean Paul
	<sean@...rly.run>, Konrad Dybcio <konradybcio@...nel.org>,
        Abhinav Kumar
	<quic_abhinavk@...cinc.com>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie
	<airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Viresh Kumar
	<vireshk@...nel.org>, Nishanth Menon <nm@...com>,
        Stephen Boyd
	<sboyd@...nel.org>, Rob Herring <robh@...nel.org>,
        Krzysztof Kozlowski
	<krzk+dt@...nel.org>,
        Conor Dooley <conor+dt@...nel.org>,
        Bjorn Andersson
	<andersson@...nel.org>
CC: <linux-arm-msm@...r.kernel.org>, <dri-devel@...ts.freedesktop.org>,
        <freedreno@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        <linux-pm@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: Re: [PATCH RFC 1/3] drm/msm/adreno: Add support for ACD

On 11/4/2024 9:14 PM, neil.armstrong@...aro.org wrote:
> On 11/10/2024 22:29, Akhil P Oommen wrote:
>> ACD a.k.a Adaptive Clock Distribution is a feature which helps to reduce
>> the power consumption. In some chipsets, it is also a requirement to
>> support higher GPU frequencies. This patch adds support for GPU ACD by
>> sending necessary data to GMU and AOSS. The feature support for the
>> chipset is detected based on devicetree data.
>>
>> Signed-off-by: Akhil P Oommen <quic_akhilpo@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/adreno/a6xx_gmu.c | 81 +++++++++++++++++++++++++
>> +++-------
>>   drivers/gpu/drm/msm/adreno/a6xx_gmu.h |  1 +
>>   drivers/gpu/drm/msm/adreno/a6xx_hfi.c | 36 ++++++++++++++++
>>   drivers/gpu/drm/msm/adreno/a6xx_hfi.h | 21 +++++++++
>>   4 files changed, 124 insertions(+), 15 deletions(-)
>>
> 
> <snip>
> 
>> +
>> +static int a6xx_hfi_enable_acd(struct a6xx_gmu *gmu)
>> +{
>> +    struct a6xx_hfi_acd_table *acd_table = &gmu->acd_table;
>> +    struct a6xx_hfi_msg_feature_ctrl msg = {
>> +        .feature = HFI_FEATURE_ACD,
>> +        .enable = 1,
>> +        .data = 0,
>> +    };
>> +    int ret;
>> +
>> +    if (!acd_table->enable_by_level)
>> +        return 0;
>> +
>> +    /* Enable ACD feature at GMU */
>> +    ret = a6xx_hfi_send_msg(gmu, HFI_H2F_FEATURE_CTRL, &msg,
>> sizeof(msg), NULL, 0);
>> +    if (ret) {
>> +        DRM_DEV_ERROR(gmu->dev, "Unable to enable ACD (%d)\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    /* Send ACD table to GMU */
>> +    ret = a6xx_hfi_send_msg(gmu, HFI_H2F_MSG_ACD, &msg, sizeof(msg),
>> NULL, 0);
> 
> This looks wrong, in this exact code, you never use the acd_table...
> perhaps it should be acd_table here

Whoops! Weirdly gmu didn't explode when I tested.

Thanks for your keen eye.

-Akhil.

> 
>> +    if (ret) {
>> +        DRM_DEV_ERROR(gmu->dev, "Unable to ACD table (%d)\n", ret);
>> +        return ret;
>> +    }
>> +
>> +    return 0;
>> +}
>> +
>>   static int a6xx_hfi_send_test(struct a6xx_gmu *gmu)
>>   {
>>       struct a6xx_hfi_msg_test msg = { 0 };
>> @@ -756,6 +788,10 @@ int a6xx_hfi_start(struct a6xx_gmu *gmu, int
>> boot_state)
>>       if (ret)
>>           return ret;
>>   +    ret = a6xx_hfi_enable_acd(gmu);
>> +    if (ret)
>> +        return ret;
>> +
>>       ret = a6xx_hfi_send_core_fw_start(gmu);
>>       if (ret)
>>           return ret;
>> diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.h b/drivers/gpu/drm/
>> msm/adreno/a6xx_hfi.h
>> index 528110169398..51864c8ad0e6 100644
>> --- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.h
>> +++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.h
>> @@ -151,12 +151,33 @@ struct a6xx_hfi_msg_test {
>>       u32 header;
>>   };
>>   +#define HFI_H2F_MSG_ACD 7
>> +#define MAX_ACD_STRIDE 2
>> +
>> +struct a6xx_hfi_acd_table {
>> +    u32 header;
>> +    u32 version;
>> +    u32 enable_by_level;
>> +    u32 stride;
>> +    u32 num_levels;
>> +    u32 data[16 * MAX_ACD_STRIDE];
>> +};
>> +
>>   #define HFI_H2F_MSG_START 10
>>     struct a6xx_hfi_msg_start {
>>       u32 header;
>>   };
>>   +#define HFI_H2F_FEATURE_CTRL 11
>> +
>> +struct a6xx_hfi_msg_feature_ctrl {
>> +    u32 header;
>> +    u32 feature;
>> +    u32 enable;
>> +    u32 data;
>> +};
>> +
>>   #define HFI_H2F_MSG_CORE_FW_START 14
>>     struct a6xx_hfi_msg_core_fw_start {
>>
> 
> Thanks,
> Neil