linux-kernel - Re: [PATCH v3,3/3] drm/mediatek: dp: Add the audio divider to mtk_dp

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Message-ID: <65da6005-3c07-a7ea-6b63-db45c8915ae8@collabora.com>
Date:   Thu, 20 Jul 2023 13:54:28 +0200
From:   AngeloGioacchino Del Regno 
        <angelogioacchino.delregno@...labora.com>
To:     Alexandre Mergnat <amergnat@...libre.com>,
        Shuijing Li <shuijing.li@...iatek.com>,
        chunkuang.hu@...nel.org, p.zabel@...gutronix.de, airlied@...il.com,
        daniel@...ll.ch, robh+dt@...nel.org,
        krzysztof.kozlowski+dt@...aro.org, conor+dt@...nel.org,
        matthias.bgg@...il.com, jitao.shi@...iatek.com
Cc:     dri-devel@...ts.freedesktop.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Project_Global_Chrome_Upstream_Group@...iatek.com
Subject: Re: [PATCH v3,3/3] drm/mediatek: dp: Add the audio divider to
 mtk_dp_data struct

Il 20/07/23 12:14, Alexandre Mergnat ha scritto:
> 
> 
> On 20/07/2023 10:26, Shuijing Li wrote:
>> Due to the difference of HW, different dividers need to be set.
>>
>> Signed-off-by: Shuijing Li <shuijing.li@...iatek.com>
>> Signed-off-by: Jitao Shi <jitao.shi@...iatek.com>
>> ---
>> Changes in v3:
>> Separate these two things into two different patches.
>> per suggestion from the previous thread:
>> https://lore.kernel.org/lkml/e2ad22bcba31797f38a12a488d4246a01bf0cb2e.camel@mediatek.com/
>> Changes in v2:
>> - change the variables' name to be more descriptive
>> - add a comment that describes the function of mtk_dp_audio_sample_arrange
>> - reduce indentation by doing the inverse check
>> - add a definition of some bits
>> - add support for mediatek, mt8188-edp-tx
>> per suggestion from the previous thread:
>> https://lore.kernel.org/lkml/ac0fcec9-a2fe-06cc-c727-189ef7babe9c@collabora.com/
>> ---
>>   drivers/gpu/drm/mediatek/mtk_dp.c     | 7 ++++++-
>>   drivers/gpu/drm/mediatek/mtk_dp_reg.h | 1 +
>>   2 files changed, 7 insertions(+), 1 deletion(-)
>>
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dp.c b/drivers/gpu/drm/mediatek/mtk_dp.c
>> index d8cda83d6fef..8e1a13ab2ba2 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dp.c
>> +++ b/drivers/gpu/drm/mediatek/mtk_dp.c
>> @@ -140,6 +140,7 @@ struct mtk_dp_data {
>>       const struct mtk_dp_efuse_fmt *efuse_fmt;
>>       bool audio_supported;
>>       bool audio_pkt_in_hblank_area;
>> +    u16 audio_m_div2_bit;
>>   };
>>   static const struct mtk_dp_efuse_fmt mt8195_edp_efuse_fmt[MTK_DP_CAL_MAX] = {
>> @@ -648,7 +649,7 @@ static void mtk_dp_audio_sdp_asp_set_channels(struct mtk_dp 
>> *mtk_dp,
>>   static void mtk_dp_audio_set_divider(struct mtk_dp *mtk_dp)
>>   {
>>       mtk_dp_update_bits(mtk_dp, MTK_DP_ENC0_P0_30BC,
>> -               AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2,
>> +               mtk_dp->data->audio_m_div2_bit,
>>                  AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MASK);
>>   }
>> @@ -2636,6 +2637,7 @@ static const struct mtk_dp_data mt8188_edp_data = {
>>       .efuse_fmt = mt8195_edp_efuse_fmt,
>>       .audio_supported = false,
>>       .audio_pkt_in_hblank_area = false,
>> +    .audio_m_div2_bit = MT8188_AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2,
>>   };
>>   static const struct mtk_dp_data mt8188_dp_data = {
>> @@ -2644,6 +2646,7 @@ static const struct mtk_dp_data mt8188_dp_data = {
>>       .efuse_fmt = mt8195_dp_efuse_fmt,
>>       .audio_supported = true,
>>       .audio_pkt_in_hblank_area = true,
>> +    .audio_m_div2_bit = MT8188_AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2,
>>   };
>>   static const struct mtk_dp_data mt8195_edp_data = {
>> @@ -2652,6 +2655,7 @@ static const struct mtk_dp_data mt8195_edp_data = {
>>       .efuse_fmt = mt8195_edp_efuse_fmt,
>>       .audio_supported = false,
>>       .audio_pkt_in_hblank_area = false,
>> +    .audio_m_div2_bit = AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2,
>>   };
>>   static const struct mtk_dp_data mt8195_dp_data = {
>> @@ -2660,6 +2664,7 @@ static const struct mtk_dp_data mt8195_dp_data = {
>>       .efuse_fmt = mt8195_dp_efuse_fmt,
>>       .audio_supported = true,
>>       .audio_pkt_in_hblank_area = false,
>> +    .audio_m_div2_bit = AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2,
>>   };
>>   static const struct of_device_id mtk_dp_of_match[] = {
>> diff --git a/drivers/gpu/drm/mediatek/mtk_dp_reg.h 
>> b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
>> index f38d6ff12afe..6d7f0405867e 100644
>> --- a/drivers/gpu/drm/mediatek/mtk_dp_reg.h
>> +++ b/drivers/gpu/drm/mediatek/mtk_dp_reg.h
>> @@ -162,6 +162,7 @@
>>   #define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_2    (1 << 8)
>>   #define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_4    (2 << 8)
>>   #define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_MUL_8    (3 << 8)
>> +#define MT8188_AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2    (4 << 8)
> 
> IMO, it's a bit weird to have SoC specific define in the generic header.
> Are you sure this bit is only available for MT8188 ?
> 

Eh, the P0_DIV2 bit is 5<<8 for MT8195, while for 8188 it's 4<<8, clearly :-)

>>   #define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_2    (5 << 8)
>>   #define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_4    (6 << 8)
>>   #define AUDIO_M_CODE_MULT_DIV_SEL_DP_ENC0_P0_DIV_8    (7 << 8)
> 
> Reviewed-by: Alexandre Mergnat <amergnat@...libre.com>
>