linux-kernel - Re: [PATCH] drm/amdgpu: use static ids for ACP platform devs

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Message-ID: <2804615.mvXUDI8C0e@natalenko.name>
Date: Mon, 10 Nov 2025 08:28:10 +0100
From: Oleksandr Natalenko <oleksandr@...alenko.name>
To: dri-devel@...ts.freedesktop.org, amd-gfx@...ts.freedesktop.org,
 linux-kernel@...r.kernel.org, Brady Norander <bradynorander@...il.com>
Cc: alexander.deucher@....com, christian.koenig@....com, airlied@...il.com,
 simona@...ll.ch, sunil.khatri@....com, boyuan.zhang@....com
Subject: Re: [PATCH] drm/amdgpu: use static ids for ACP platform devs

Hello.

On úterý 25. března 2025 22:05:17, středoevropský standardní čas Brady Norander wrote:
> mfd_add_hotplug_devices() assigns child platform devices with
> PLATFORM_DEVID_AUTO, but the ACP machine drivers expect the platform
> device names to never change. Use mfd_add_devices() instead and give
> each cell a unique id.
> 
> Signed-off-by: Brady Norander <bradynorander@...il.com>
> ---
>  drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 10 ++++++++--
>  1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> index deb0785350e8..9c657637d317 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> @@ -302,17 +302,19 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
>  		adev->acp.acp_res[2].end = adev->acp.acp_res[2].start;
>  
>  		adev->acp.acp_cell[0].name = "acp_audio_dma";
> +		adev->acp.acp_cell[0].id = 0;
>  		adev->acp.acp_cell[0].num_resources = 3;
>  		adev->acp.acp_cell[0].resources = &adev->acp.acp_res[0];
>  		adev->acp.acp_cell[0].platform_data = &adev->asic_type;
>  		adev->acp.acp_cell[0].pdata_size = sizeof(adev->asic_type);
>  
>  		adev->acp.acp_cell[1].name = "designware-i2s";
> +		adev->acp.acp_cell[1].id = 1;
>  		adev->acp.acp_cell[1].num_resources = 1;
>  		adev->acp.acp_cell[1].resources = &adev->acp.acp_res[1];
>  		adev->acp.acp_cell[1].platform_data = &i2s_pdata[0];
>  		adev->acp.acp_cell[1].pdata_size = sizeof(struct i2s_platform_data);
> -		r = mfd_add_hotplug_devices(adev->acp.parent, adev->acp.acp_cell, 2);
> +		r = mfd_add_devices(adev->acp.parent, 0, adev->acp.acp_cell, 2, NULL, 0, NULL);
>  		if (r)
>  			goto failure;
>  		r = device_for_each_child(adev->acp.parent, &adev->acp.acp_genpd->gpd,
> @@ -410,30 +412,34 @@ static int acp_hw_init(struct amdgpu_ip_block *ip_block)
>  		adev->acp.acp_res[4].end = adev->acp.acp_res[4].start;
>  
>  		adev->acp.acp_cell[0].name = "acp_audio_dma";
> +		adev->acp.acp_cell[0].id = 0;
>  		adev->acp.acp_cell[0].num_resources = 5;
>  		adev->acp.acp_cell[0].resources = &adev->acp.acp_res[0];
>  		adev->acp.acp_cell[0].platform_data = &adev->asic_type;
>  		adev->acp.acp_cell[0].pdata_size = sizeof(adev->asic_type);
>  
>  		adev->acp.acp_cell[1].name = "designware-i2s";
> +		adev->acp.acp_cell[1].id = 1;
>  		adev->acp.acp_cell[1].num_resources = 1;
>  		adev->acp.acp_cell[1].resources = &adev->acp.acp_res[1];
>  		adev->acp.acp_cell[1].platform_data = &i2s_pdata[0];
>  		adev->acp.acp_cell[1].pdata_size = sizeof(struct i2s_platform_data);
>  
>  		adev->acp.acp_cell[2].name = "designware-i2s";
> +		adev->acp.acp_cell[2].id = 2;
>  		adev->acp.acp_cell[2].num_resources = 1;
>  		adev->acp.acp_cell[2].resources = &adev->acp.acp_res[2];
>  		adev->acp.acp_cell[2].platform_data = &i2s_pdata[1];
>  		adev->acp.acp_cell[2].pdata_size = sizeof(struct i2s_platform_data);
>  
>  		adev->acp.acp_cell[3].name = "designware-i2s";
> +		adev->acp.acp_cell[3].id = 3;
>  		adev->acp.acp_cell[3].num_resources = 1;
>  		adev->acp.acp_cell[3].resources = &adev->acp.acp_res[3];
>  		adev->acp.acp_cell[3].platform_data = &i2s_pdata[2];
>  		adev->acp.acp_cell[3].pdata_size = sizeof(struct i2s_platform_data);
>  
> -		r = mfd_add_hotplug_devices(adev->acp.parent, adev->acp.acp_cell, ACP_DEVS);
> +		r = mfd_add_devices(adev->acp.parent, 0, adev->acp.acp_cell, ACP_DEVS, NULL, 0, NULL);
>  		if (r)
>  			goto failure;

Is this patch still supposed to be applied?

Thank you.

-- 
Oleksandr Natalenko, MSE
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