linux-kernel - Re: [PATCH v2 4/4] drm/msm/dpu: Set DATA

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Message-ID: <baa25817-4a0d-551d-a351-21cc1525a932@quicinc.com>
Date:   Mon, 8 May 2023 16:17:54 -0700
From:   Jessica Zhang <quic_jesszhan@...cinc.com>
To:     Marijn Suijten <marijn.suijten@...ainline.org>
CC:     <freedreno@...ts.freedesktop.org>, Sean Paul <sean@...rly.run>,
        "Abhinav Kumar" <quic_abhinavk@...cinc.com>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
        Konrad Dybcio <konrad.dybcio@...aro.org>,
        <linux-arm-msm@...r.kernel.org>,
        Dmitry Baryshkov <dmitry.baryshkov@...aro.org>
Subject: Re: [PATCH v2 4/4] drm/msm/dpu: Set DATA_COMPRESS for command mode



On 5/7/2023 9:06 AM, Marijn Suijten wrote:
> On 2023-05-05 14:23:51, Jessica Zhang wrote:
>> Add a DPU INTF op to set DATA_COMPRESS register for command mode panels if
>> the DPU_INTF_DATA_COMPRESS feature flag is set. This flag needs to be
>> enabled in order for DSC v1.2 to work.
>>
>> Note: These changes are for command mode only. Video mode changes will
>> be posted along with the DSC v1.2 support for DP.
> 
> Nit: the "command mode" parts of both paragraphs only apply to the call
> in dpu_encoder_phys_cmd, right?  If so, and the INTF op remains the same
> for video mode (but only the call needs to be added to the
> dpu_encoder_phy_vid), make this a bit more clear in your commit message.
> 
>> Changes in v2:
>> - Fixed whitespace issue in macro definition
>> - Read INTF_CONFIG2 before writing to DATA_COMPRESS bit
>> - Only set dpu_hw_intf_ops.data_compress if DATA_COMPRESS feature is set
>> - Removed `inline` from dpu_hw_intf_enable_compression declaration
>>
>> Signed-off-by: Jessica Zhang <quic_jesszhan@...cinc.com>
>> ---
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c |  3 +++
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c          | 11 +++++++++++
>>   drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h          |  2 ++
>>   3 files changed, 16 insertions(+)
>>
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
>> index d8ed85a238af..1a4c20f02312 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_encoder_phys_cmd.c
>> @@ -68,6 +68,9 @@ static void _dpu_encoder_phys_cmd_update_intf_cfg(
>>   				phys_enc->hw_intf,
>>   				true,
>>   				phys_enc->hw_pp->idx);
>> +
>> +	if (phys_enc->hw_intf->ops.enable_compression)
>> +		phys_enc->hw_intf->ops.enable_compression(phys_enc->hw_intf);
>>   }
>>   
>>   static void dpu_encoder_phys_cmd_pp_tx_done_irq(void *arg, int irq_idx)
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>> index 6485500eedb8..322c55a5042c 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.c
>> @@ -91,6 +91,14 @@
>>   
>>   #define INTF_CFG2_DATABUS_WIDEN	BIT(0)
>>   #define INTF_CFG2_DATA_HCTL_EN	BIT(4)
>> +#define INTF_CFG2_DCE_DATA_COMPRESS     BIT(12)
>> +
>> +static void dpu_hw_intf_enable_compression(struct dpu_hw_intf *ctx)
>> +{
>> +	u32 intf_cfg2 = DPU_REG_READ(&ctx->hw, INTF_CONFIG2);
>> +
>> +	DPU_REG_WRITE(&ctx->hw, INTF_CONFIG2, intf_cfg2 | INTF_CFG2_DCE_DATA_COMPRESS);
> 
> I'm not sure if it's more idiomatic to write:
> 
>      intf_cfg2 |= INTF_CFG2_DCE_DATA_COMPRESS;
> 
> On a separate line.

Hi Marijn,

Sounds good.

> 
>> +}
> 
> Move the function close to the bottom of this file.  Right now all the
> functions are defined approximately in the same order as they're listed
> in the header and assigned in _setup_intf_ops().

Acked.

> 
>>   
>>   static void dpu_hw_intf_setup_timing_engine(struct dpu_hw_intf *ctx,
>>   		const struct intf_timing_params *p,
>> @@ -542,6 +550,9 @@ static void _setup_intf_ops(struct dpu_hw_intf_ops *ops,
>>   		ops->vsync_sel = dpu_hw_intf_vsync_sel;
>>   		ops->disable_autorefresh = dpu_hw_intf_disable_autorefresh;
>>   	}
>> +
>> +	if (cap & BIT(DPU_INTF_DATA_COMPRESS))
>> +		ops->enable_compression = dpu_hw_intf_enable_compression;
>>   }
>>   
>>   struct dpu_hw_intf *dpu_hw_intf_init(const struct dpu_intf_cfg *cfg,
>> diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>> index 73b0885918f8..a8def68a5ec2 100644
>> --- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>> +++ b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_intf.h
>> @@ -70,6 +70,7 @@ struct intf_status {
>>    * @get_autorefresh:            Retrieve autorefresh config from hardware
>>    *                              Return: 0 on success, -ETIMEDOUT on timeout
>>    * @vsync_sel:                  Select vsync signal for tear-effect configuration
>> + * @enable_compression: Enable data compression
> 
> Indent to match above.

Sure, is the plan to correct the whitespace in the first half of the 
comment block in the future?

Thanks,

Jessica Zhang

> 
> - Marijn
> 
>>    */
>>   struct dpu_hw_intf_ops {
>>   	void (*setup_timing_gen)(struct dpu_hw_intf *intf,
>> @@ -107,6 +108,7 @@ struct dpu_hw_intf_ops {
>>   	 * Disable autorefresh if enabled
>>   	 */
>>   	void (*disable_autorefresh)(struct dpu_hw_intf *intf, uint32_t encoder_id, u16 vdisplay);
>> +	void (*enable_compression)(struct dpu_hw_intf *intf);
>>   };
>>   
>>   struct dpu_hw_intf {
>>
>> -- 
>> 2.40.1
>>