Re: [PATCH v12 08/12] media: rkisp1: Support i.MX8MP's 34-bit DMA

[Alexander Stein <alexander.stein@ew.tq-group.com>]

Hi Paul,

thanks for the update.

Am Freitag, 16. Februar 2024, 10:54:54 CET schrieb Paul Elder:
> On the ISP that is integrated in the i.MX8MP, DMA addresses have been
> extended to 34 bits, with the 32 MSBs stored in the DMA address
> registers and the 2 LSBs set to 0.
> 
> To support this:
> - Shift the addresses to the right by 2 when writing to registers
> - Set the dma mask to 34 bits
> - Use dma_addr_t instead of u32 when storing the addresses
> 
> Signed-off-by: Paul Elder <paul.elder@ideasonboard.com>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> Tested-by: Alexander Stein <alexander.stein@ew.tq-group.com>
> Tested-by: Adam Ford <aford173@gmail.com>
> Reviewed-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
> ---
> Changes since v5:
> 
> - Improve the commit message
> 
> Changes since v4:
> 
> - Squash in fix from Tomi:
>   -
> https://gitlab.com/ideasonboard/nxp/linux/-/commit/d6477fe673b1c0d05d12ae21
> d8db9a03b07e7fea
> 
> Changes since v2:
> 
> - Document the RKISP1_FEATURE_DMA_34BIT bit
> - Use the rkisp1_has_feature() macro
> ---
>  .../platform/rockchip/rkisp1/rkisp1-capture.c | 20 ++++++++++---------
>  .../platform/rockchip/rkisp1/rkisp1-common.h  |  4 +++-
>  .../platform/rockchip/rkisp1/rkisp1-dev.c     |  8 ++++++++
>  3 files changed, 22 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
> b/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c index
> ca95f62822fa..1ee7639c42b7 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-capture.c
> @@ -648,11 +648,13 @@ static void rkisp1_dummy_buf_destroy(struct
> rkisp1_capture *cap)
> 
>  static void rkisp1_set_next_buf(struct rkisp1_capture *cap)
>  {
> +	u8 shift = rkisp1_has_feature(cap->rkisp1, DMA_34BIT) ? 2 : 0;
> +
>  	cap->buf.curr = cap->buf.next;
>  	cap->buf.next = NULL;
> 
>  	if (!list_empty(&cap->buf.queue)) {
> -		u32 *buff_addr;
> +		dma_addr_t *buff_addr;
> 
>  		cap->buf.next = list_first_entry(&cap->buf.queue, struct 
rkisp1_buffer,
> queue); list_del(&cap->buf.next->queue);
> @@ -660,7 +662,7 @@ static void rkisp1_set_next_buf(struct rkisp1_capture
> *cap) buff_addr = cap->buf.next->buff_addr;
> 
>  		rkisp1_write(cap->rkisp1, cap->config->mi.y_base_ad_init,
> -			     buff_addr[RKISP1_PLANE_Y]);
> +			     buff_addr[RKISP1_PLANE_Y] >> shift);
>  		/*
>  		 * In order to support grey format we capture
>  		 * YUV422 planar format from the camera and
> @@ -669,17 +671,17 @@ static void rkisp1_set_next_buf(struct rkisp1_capture
> *cap) if (cap->pix.cfg->fourcc == V4L2_PIX_FMT_GREY) {
>  			rkisp1_write(cap->rkisp1,
>  				     cap->config->mi.cb_base_ad_init,
> -				     cap->buf.dummy.dma_addr);
> +				     cap->buf.dummy.dma_addr >> 
shift);
>  			rkisp1_write(cap->rkisp1,
>  				     cap->config->mi.cr_base_ad_init,
> -				     cap->buf.dummy.dma_addr);
> +				     cap->buf.dummy.dma_addr >> 
shift);
>  		} else {
>  			rkisp1_write(cap->rkisp1,
>  				     cap->config->mi.cb_base_ad_init,
> -				     buff_addr[RKISP1_PLANE_CB]);
> +				     buff_addr[RKISP1_PLANE_CB] >> 
shift);
>  			rkisp1_write(cap->rkisp1,
>  				     cap->config->mi.cr_base_ad_init,
> -				     buff_addr[RKISP1_PLANE_CR]);
> +				     buff_addr[RKISP1_PLANE_CR] >> 
shift);
>  		}
>  	} else {
>  		/*
> @@ -687,11 +689,11 @@ static void rkisp1_set_next_buf(struct rkisp1_capture
> *cap) * throw data if there is no available buffer.
>  		 */
>  		rkisp1_write(cap->rkisp1, cap->config->mi.y_base_ad_init,
> -			     cap->buf.dummy.dma_addr);
> +			     cap->buf.dummy.dma_addr >> shift);
>  		rkisp1_write(cap->rkisp1, cap->config->mi.cb_base_ad_init,
> -			     cap->buf.dummy.dma_addr);
> +			     cap->buf.dummy.dma_addr >> shift);
>  		rkisp1_write(cap->rkisp1, cap->config->mi.cr_base_ad_init,
> -			     cap->buf.dummy.dma_addr);
> +			     cap->buf.dummy.dma_addr >> shift);
>  	}
> 
>  	/* Set plane offsets */
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h index
> 69940014d597..26573f6ae575 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-common.h
> @@ -114,6 +114,7 @@ enum rkisp1_isp_pad {
>   * @RKISP1_FEATURE_MAIN_STRIDE: The ISP supports configurable stride on the
> main path * @RKISP1_FEATURE_SELF_PATH: The ISP has a self path
>   * @RKISP1_FEATURE_DUAL_CROP: The ISP has the dual crop block at the
> resizer input + * @RKISP1_FEATURE_DMA_34BIT: The ISP uses 34-bit DMA
> addresses
>   *
>   * The ISP features are stored in a bitmask in &rkisp1_info.features and
> allow * the driver to implement support for features present in some ISP
> versions @@ -124,6 +125,7 @@ enum rkisp1_feature {
>  	RKISP1_FEATURE_MAIN_STRIDE = BIT(1),
>  	RKISP1_FEATURE_SELF_PATH = BIT(2),
>  	RKISP1_FEATURE_DUAL_CROP = BIT(3),
> +	RKISP1_FEATURE_DMA_34BIT = BIT(4),
>  };
> 
>  #define rkisp1_has_feature(rkisp1, feature) \
> @@ -239,7 +241,7 @@ struct rkisp1_vdev_node {
>  struct rkisp1_buffer {
>  	struct vb2_v4l2_buffer vb;
>  	struct list_head queue;
> -	u32 buff_addr[VIDEO_MAX_PLANES];
> +	dma_addr_t buff_addr[VIDEO_MAX_PLANES];
>  };
> 
>  /*
> diff --git a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c index
> d0a3a13d9dd7..54a62487a4e8 100644
> --- a/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> +++ b/drivers/media/platform/rockchip/rkisp1/rkisp1-dev.c
> @@ -552,6 +552,7 @@ static int rkisp1_probe(struct platform_device *pdev)
>  	struct device *dev = &pdev->dev;
>  	struct rkisp1_device *rkisp1;
>  	struct v4l2_device *v4l2_dev;
> +	unsigned long long dma_mask;

The signature for dma_set_mask_and_coherent() uses u64 for the mask, so I 
would use the same type here as well.

Best regards,
Alexander

>  	unsigned int i;
>  	int ret, irq;
>  	u32 cif_id;
> @@ -566,6 +567,13 @@ static int rkisp1_probe(struct platform_device *pdev)
>  	dev_set_drvdata(dev, rkisp1);
>  	rkisp1->dev = dev;
> 
> +	dma_mask = rkisp1_has_feature(rkisp1, DMA_34BIT) ? DMA_BIT_MASK(34) 
:
> +							   
DMA_BIT_MASK(32);
> +
> +	ret = dma_set_mask_and_coherent(dev, dma_mask);
> +	if (ret)
> +		return ret;
> +
>  	mutex_init(&rkisp1->stream_lock);
> 
>  	rkisp1->base_addr = devm_platform_ioremap_resource(pdev, 0);


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