Re: [PATCH 2/3] drm/msm/mdss: Enable INT2_GDSC alongside CORE_GDSC

[Yongxing Mou <yongxing.mou@oss.qualcomm.com>]

On 7/22/2026 2:40 AM, Dmitry Baryshkov wrote:
> On Mon, Jul 20, 2026 at 04:43:54PM +0800, Yongxing Mou wrote:
>> Kaanapali (SM8750) and Glymur use two display power domains.
>> CORE_GDSC powers the main display hardware while INT2_GDSC powers
>> a subset of SSPP blocks (VIG2/VIG3/DMA5/DMA6).
>>
>> The MDSS driver currently relies on the default runtime PM handling
>> and does not enable the secondary INT2_GDSC. As a result, display
>> pipes backed by INT2_GDSC remain inaccessible.
>>
>> Attach and manage both power domains explicitly and enable them
>> during MDSS runtime PM activation.
>>
>> Signed-off-by: Yongxing Mou <yongxing.mou@oss.qualcomm.com>
>> ---
>>   drivers/gpu/drm/msm/msm_mdss.c | 53 +++++++++++++++++++++++++++++++++++++++++-
>>   1 file changed, 52 insertions(+), 1 deletion(-)
> 
> Why is it being handled in the MDSS rather than DPU?
> 
Will move it next patchset.
>> @@ -421,6 +451,27 @@ static struct msm_mdss *msm_mdss_init(struct platform_device *pdev, bool is_mdp5
>>   	irq_set_chained_handler_and_data(irq, msm_mdss_irq,
>>   					 msm_mdss);
>>   
>> +	/*
>> +	 * When two power domains are listed in DT, the core framework does not
>> +	 * auto-attach either of them.  Attach and manage both explicitly so
>> +	 * that INT2_GDSC (needed for VIG2/VIG3) is enabled alongside the main
>> +	 * CORE_GDSC.  Single-domain platforms are unaffected.
>> +	 */
>> +	if (of_count_phandle_with_args(pdev->dev.of_node, "power-domains",
>> +				       "#power-domain-cells") > 1) {
>> +		static const char * const mdss_pd_names[] = { "core", "int2" };
>> +		static const struct dev_pm_domain_attach_data pd_data = {
>> +			.pd_names = mdss_pd_names,
>> +			.num_pd_names = ARRAY_SIZE(mdss_pd_names),
>> +			.pd_flags = PD_FLAG_NO_DEV_LINK,
> 
> Can't you use DL_FLAG_PM_RUNTIME here?
> 
Got it.Will ust it next patch.
>> +		};
>> +
>> +		ret = devm_pm_domain_attach_list(&pdev->dev, &pd_data,
>> +						 &msm_mdss->pd_list);
>> +		if (ret < 0)
>> +			return ERR_PTR(ret);
>> +	}
>> +
>>   	pm_runtime_enable(&pdev->dev);
>>   
>>   	return msm_mdss;
>>
>> -- 
>> 2.43.0
>>
>