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Date: Sun, 18 Feb 2024 20:53:47 +0200
From: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
To: Alexander Stein <alexander.stein@ew.tq-group.com>
Cc: linux-media@vger.kernel.org, linux-rockchip@lists.infradead.org,
	devicetree@vger.kernel.org,
	Paul Elder <paul.elder@ideasonboard.com>,
	kieran.bingham@ideasonboard.com, tomi.valkeinen@ideasonboard.com,
	umang.jain@ideasonboard.com, aford173@gmail.com,
	Dafna Hirschfeld <dafna@fastmail.com>,
	Mauro Carvalho Chehab <mchehab@kernel.org>,
	Heiko Stuebner <heiko@sntech.de>,
	"moderated list:ARM/Rockchip SoC support" <linux-arm-kernel@lists.infradead.org>,
	open list <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v12 08/12] media: rkisp1: Support i.MX8MP's 34-bit DMA
Message-ID: <20240218185347.GJ7120@pendragon.ideasonboard.com>
References: <20240216095458.2919694-1-paul.elder@ideasonboard.com>
 <20240216095458.2919694-9-paul.elder@ideasonboard.com>
 <1884916.CQOukoFCf9@steina-w>
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In-Reply-To: <1884916.CQOukoFCf9@steina-w>

Hi Alexander,

On Fri, Feb 16, 2024 at 11:31:46AM +0100, Alexander Stein wrote:
> 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,

On a side note, any chance your mail client would have an option to
avoid this kind of wrapping ? :-)

> > 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.

I'll do so in v13.

> >  	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);

-- 
Regards,

Laurent Pinchart