[alsa-devel] [PATCH 1/8] drm/amd/amdgpu: Added asic_type as ACP DMA driver platform data

[Christian König]

Am 23.06.2017 um 18:34 schrieb Alex Deucher:
> From: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
>
> asic_type information is passed to ACP DMA Driver as platform data.
> We need this to determine whether the asic is Carrizo (CZ) or
> Stoney (ST) in the acp sound driver.
>
> Reviewed-by: Alex Deucher <alexander.deucher at amd.com>
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda at amd.com>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>
> ---
>   drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c | 4 ++++
>   sound/soc/amd/acp-pcm-dma.c             | 8 ++------
>   sound/soc/amd/acp.h                     | 7 +++++++
>   3 files changed, 13 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> index 06879d1..7a2a765 100644
> --- a/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> +++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_acp.c
> @@ -262,6 +262,7 @@ static int acp_hw_init(void *handle)
>   	uint64_t acp_base;
>   	struct device *dev;
>   	struct i2s_platform_data *i2s_pdata;
> +	u32 asic_type;
>   
>   	struct amdgpu_device *adev = (struct amdgpu_device *)handle;
>   
> @@ -271,6 +272,7 @@ static int acp_hw_init(void *handle)
>   	if (!ip_block)
>   		return -EINVAL;
>   
> +	asic_type = adev->asic_type;
>   	r = amd_acp_hw_init(adev->acp.cgs_device,
>   			    ip_block->version->major, ip_block->version->minor);
>   	/* -ENODEV means board uses AZ rather than ACP */
> @@ -355,6 +357,8 @@ static int acp_hw_init(void *handle)
>   	adev->acp.acp_cell[0].name = "acp_audio_dma";
>   	adev->acp.acp_cell[0].num_resources = 4;
>   	adev->acp.acp_cell[0].resources = &adev->acp.acp_res[0];
> +	adev->acp.acp_cell[0].platform_data = &asic_type;
> +	adev->acp.acp_cell[0].pdata_size = sizeof(asic_type);

Have the painkillers jellyfied my brain or are you setting a pointer in 
the amdgpu device structure to some variable on the stack?

If it's just for initialization then that's probably ok, but I would 
reset the pointer at the end of the function.

Otherwise somebody might have the idea to dereference it later on and 
that can only lead to trouble.

Christian.

>   
>   	adev->acp.acp_cell[1].name = "designware-i2s";
>   	adev->acp.acp_cell[1].num_resources = 1;
> diff --git a/sound/soc/amd/acp-pcm-dma.c b/sound/soc/amd/acp-pcm-dma.c
> index 08b1399..dcbf997 100644
> --- a/sound/soc/amd/acp-pcm-dma.c
> +++ b/sound/soc/amd/acp-pcm-dma.c
> @@ -73,12 +73,6 @@ static const struct snd_pcm_hardware acp_pcm_hardware_capture = {
>   	.periods_max = CAPTURE_MAX_NUM_PERIODS,
>   };
>   
> -struct audio_drv_data {
> -	struct snd_pcm_substream *play_stream;
> -	struct snd_pcm_substream *capture_stream;
> -	void __iomem *acp_mmio;
> -};
> -
>   static u32 acp_reg_read(void __iomem *acp_mmio, u32 reg)
>   {
>   	return readl(acp_mmio + (reg * 4));
> @@ -916,6 +910,7 @@ static int acp_audio_probe(struct platform_device *pdev)
>   	int status;
>   	struct audio_drv_data *audio_drv_data;
>   	struct resource *res;
> +	const u32 *pdata = pdev->dev.platform_data;
>   
>   	audio_drv_data = devm_kzalloc(&pdev->dev, sizeof(struct audio_drv_data),
>   					GFP_KERNEL);
> @@ -932,6 +927,7 @@ static int acp_audio_probe(struct platform_device *pdev)
>   
>   	audio_drv_data->play_stream = NULL;
>   	audio_drv_data->capture_stream = NULL;
> +	audio_drv_data->asic_type =  *pdata;
>   
>   	res = platform_get_resource(pdev, IORESOURCE_IRQ, 0);
>   	if (!res) {
> diff --git a/sound/soc/amd/acp.h b/sound/soc/amd/acp.h
> index 330832e..28cf914 100644
> --- a/sound/soc/amd/acp.h
> +++ b/sound/soc/amd/acp.h
> @@ -84,6 +84,13 @@ struct audio_substream_data {
>   	void __iomem *acp_mmio;
>   };
>   
> +struct audio_drv_data {
> +	struct snd_pcm_substream *play_stream;
> +	struct snd_pcm_substream *capture_stream;
> +	void __iomem *acp_mmio;
> +	u32 asic_type;
> +};
> +
>   enum {
>   	ACP_TILE_P1 = 0,
>   	ACP_TILE_P2,