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

Alexander Stein
2024-02-16T10:31:47Z

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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