[05/14] media: sun6i-csi: Only configure the interface data width for parallel
diff mbox series

Message ID 20201023174546.504028-6-paul.kocialkowski@bootlin.com
State New, archived
Headers show
Series
  • Allwinner MIPI CSI-2 support for A31/V3s/A83T
Related show

Commit Message

Paul Kocialkowski Oct. 23, 2020, 5:45 p.m. UTC
Bits related to the interface data width do not have any effect when
the CSI controller is taking input from the MIPI CSI-2 controller.

In prevision of adding support for this case, set these bits
conditionally so there is no ambiguity.

Co-developed-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
Signed-off-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
---
 .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 42 +++++++++++--------
 1 file changed, 25 insertions(+), 17 deletions(-)

Comments

Maxime Ripard Oct. 26, 2020, 4 p.m. UTC | #1
On Fri, Oct 23, 2020 at 07:45:37PM +0200, Paul Kocialkowski wrote:
> Bits related to the interface data width do not have any effect when
> the CSI controller is taking input from the MIPI CSI-2 controller.

I guess it would be clearer to mention that the data width is only
applicable for parallel here.

> In prevision of adding support for this case, set these bits
> conditionally so there is no ambiguity.
> 
> Co-developed-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> Signed-off-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> ---
>  .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 42 +++++++++++--------
>  1 file changed, 25 insertions(+), 17 deletions(-)
> 
> diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> index 5d2389a5cd17..a876a05ea3c7 100644
> --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> @@ -378,8 +378,13 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
>  	unsigned char bus_width;
>  	u32 flags;
>  	u32 cfg;
> +	bool input_parallel = false;
>  	bool input_interlaced = false;
>  
> +	if (endpoint->bus_type == V4L2_MBUS_PARALLEL ||
> +	    endpoint->bus_type == V4L2_MBUS_BT656)
> +		input_parallel = true;
> +
>  	if (csi->config.field == V4L2_FIELD_INTERLACED
>  	    || csi->config.field == V4L2_FIELD_INTERLACED_TB
>  	    || csi->config.field == V4L2_FIELD_INTERLACED_BT)
> @@ -395,6 +400,26 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
>  		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK |
>  		 CSI_IF_CFG_SRC_TYPE_MASK);
>  
> +	if (input_parallel) {
> +		switch (bus_width) {
> +		case 8:
> +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> +			break;
> +		case 10:
> +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> +			break;
> +		case 12:
> +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> +			break;
> +		case 16: /* No need to configure DATA_WIDTH for 16bit */
> +			break;
> +		default:
> +			dev_warn(sdev->dev, "Unsupported bus width: %u\n",
> +				 bus_width);
> +			break;
> +		}
> +	}
> +
>  	if (input_interlaced)
>  		cfg |= CSI_IF_CFG_SRC_TYPE_INTERLACED;
>  	else
> @@ -440,23 +465,6 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
>  		break;
>  	}
>  
> -	switch (bus_width) {
> -	case 8:
> -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> -		break;
> -	case 10:
> -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> -		break;
> -	case 12:
> -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> -		break;
> -	case 16: /* No need to configure DATA_WIDTH for 16bit */
> -		break;
> -	default:
> -		dev_warn(sdev->dev, "Unsupported bus width: %u\n", bus_width);
> -		break;
> -	}
> -

Is there any reason to move it around?

Maxime
Paul Kocialkowski Oct. 27, 2020, 9:31 a.m. UTC | #2
Hi,

On Mon 26 Oct 20, 17:00, Maxime Ripard wrote:
> On Fri, Oct 23, 2020 at 07:45:37PM +0200, Paul Kocialkowski wrote:
> > Bits related to the interface data width do not have any effect when
> > the CSI controller is taking input from the MIPI CSI-2 controller.
> 
> I guess it would be clearer to mention that the data width is only
> applicable for parallel here.

Understood, will change the wording in the next version.

> > In prevision of adding support for this case, set these bits
> > conditionally so there is no ambiguity.
> > 
> > Co-developed-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> > Signed-off-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > ---
> >  .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 42 +++++++++++--------
> >  1 file changed, 25 insertions(+), 17 deletions(-)
> > 
> > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > index 5d2389a5cd17..a876a05ea3c7 100644
> > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > @@ -378,8 +378,13 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> >  	unsigned char bus_width;
> >  	u32 flags;
> >  	u32 cfg;
> > +	bool input_parallel = false;
> >  	bool input_interlaced = false;
> >  
> > +	if (endpoint->bus_type == V4L2_MBUS_PARALLEL ||
> > +	    endpoint->bus_type == V4L2_MBUS_BT656)
> > +		input_parallel = true;
> > +
> >  	if (csi->config.field == V4L2_FIELD_INTERLACED
> >  	    || csi->config.field == V4L2_FIELD_INTERLACED_TB
> >  	    || csi->config.field == V4L2_FIELD_INTERLACED_BT)
> > @@ -395,6 +400,26 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> >  		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK |
> >  		 CSI_IF_CFG_SRC_TYPE_MASK);
> >  
> > +	if (input_parallel) {
> > +		switch (bus_width) {
> > +		case 8:
> > +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> > +			break;
> > +		case 10:
> > +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> > +			break;
> > +		case 12:
> > +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> > +			break;
> > +		case 16: /* No need to configure DATA_WIDTH for 16bit */
> > +			break;
> > +		default:
> > +			dev_warn(sdev->dev, "Unsupported bus width: %u\n",
> > +				 bus_width);
> > +			break;
> > +		}
> > +	}
> > +
> >  	if (input_interlaced)
> >  		cfg |= CSI_IF_CFG_SRC_TYPE_INTERLACED;
> >  	else
> > @@ -440,23 +465,6 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> >  		break;
> >  	}
> >  
> > -	switch (bus_width) {
> > -	case 8:
> > -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> > -		break;
> > -	case 10:
> > -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> > -		break;
> > -	case 12:
> > -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> > -		break;
> > -	case 16: /* No need to configure DATA_WIDTH for 16bit */
> > -		break;
> > -	default:
> > -		dev_warn(sdev->dev, "Unsupported bus width: %u\n", bus_width);
> > -		break;
> > -	}
> > -
> 
> Is there any reason to move it around?

The main reason is cosmetics: input_parallel is introduced to match the already
existing input_interlaced variable, so it made sense to me to have both of these
conditionals one after the other instead of spreading them randomly.

I can mention this in the commit log if you prefer.
Maxime Ripard Oct. 27, 2020, 6:31 p.m. UTC | #3
On Tue, Oct 27, 2020 at 10:31:19AM +0100, Paul Kocialkowski wrote:
> Hi,
> 
> On Mon 26 Oct 20, 17:00, Maxime Ripard wrote:
> > On Fri, Oct 23, 2020 at 07:45:37PM +0200, Paul Kocialkowski wrote:
> > > Bits related to the interface data width do not have any effect when
> > > the CSI controller is taking input from the MIPI CSI-2 controller.
> > 
> > I guess it would be clearer to mention that the data width is only
> > applicable for parallel here.
> 
> Understood, will change the wording in the next version.
> 
> > > In prevision of adding support for this case, set these bits
> > > conditionally so there is no ambiguity.
> > > 
> > > Co-developed-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> > > Signed-off-by: Kévin L'hôpital <kevin.lhopital@bootlin.com>
> > > Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
> > > ---
> > >  .../platform/sunxi/sun6i-csi/sun6i_csi.c      | 42 +++++++++++--------
> > >  1 file changed, 25 insertions(+), 17 deletions(-)
> > > 
> > > diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > > index 5d2389a5cd17..a876a05ea3c7 100644
> > > --- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > > +++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
> > > @@ -378,8 +378,13 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > >  	unsigned char bus_width;
> > >  	u32 flags;
> > >  	u32 cfg;
> > > +	bool input_parallel = false;
> > >  	bool input_interlaced = false;
> > >  
> > > +	if (endpoint->bus_type == V4L2_MBUS_PARALLEL ||
> > > +	    endpoint->bus_type == V4L2_MBUS_BT656)
> > > +		input_parallel = true;
> > > +
> > >  	if (csi->config.field == V4L2_FIELD_INTERLACED
> > >  	    || csi->config.field == V4L2_FIELD_INTERLACED_TB
> > >  	    || csi->config.field == V4L2_FIELD_INTERLACED_BT)
> > > @@ -395,6 +400,26 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > >  		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK |
> > >  		 CSI_IF_CFG_SRC_TYPE_MASK);
> > >  
> > > +	if (input_parallel) {
> > > +		switch (bus_width) {
> > > +		case 8:
> > > +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> > > +			break;
> > > +		case 10:
> > > +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> > > +			break;
> > > +		case 12:
> > > +			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> > > +			break;
> > > +		case 16: /* No need to configure DATA_WIDTH for 16bit */
> > > +			break;
> > > +		default:
> > > +			dev_warn(sdev->dev, "Unsupported bus width: %u\n",
> > > +				 bus_width);
> > > +			break;
> > > +		}
> > > +	}
> > > +
> > >  	if (input_interlaced)
> > >  		cfg |= CSI_IF_CFG_SRC_TYPE_INTERLACED;
> > >  	else
> > > @@ -440,23 +465,6 @@ static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
> > >  		break;
> > >  	}
> > >  
> > > -	switch (bus_width) {
> > > -	case 8:
> > > -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
> > > -		break;
> > > -	case 10:
> > > -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
> > > -		break;
> > > -	case 12:
> > > -		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
> > > -		break;
> > > -	case 16: /* No need to configure DATA_WIDTH for 16bit */
> > > -		break;
> > > -	default:
> > > -		dev_warn(sdev->dev, "Unsupported bus width: %u\n", bus_width);
> > > -		break;
> > > -	}
> > > -
> > 
> > Is there any reason to move it around?
> 
> The main reason is cosmetics: input_parallel is introduced to match the already
> existing input_interlaced variable, so it made sense to me to have both of these
> conditionals one after the other instead of spreading them randomly.
> 
> I can mention this in the commit log if you prefer.

Yeah, that would great

Maxime

Patch
diff mbox series

diff --git a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
index 5d2389a5cd17..a876a05ea3c7 100644
--- a/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
+++ b/drivers/media/platform/sunxi/sun6i-csi/sun6i_csi.c
@@ -378,8 +378,13 @@  static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 	unsigned char bus_width;
 	u32 flags;
 	u32 cfg;
+	bool input_parallel = false;
 	bool input_interlaced = false;
 
+	if (endpoint->bus_type == V4L2_MBUS_PARALLEL ||
+	    endpoint->bus_type == V4L2_MBUS_BT656)
+		input_parallel = true;
+
 	if (csi->config.field == V4L2_FIELD_INTERLACED
 	    || csi->config.field == V4L2_FIELD_INTERLACED_TB
 	    || csi->config.field == V4L2_FIELD_INTERLACED_BT)
@@ -395,6 +400,26 @@  static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 		 CSI_IF_CFG_HREF_POL_MASK | CSI_IF_CFG_FIELD_MASK |
 		 CSI_IF_CFG_SRC_TYPE_MASK);
 
+	if (input_parallel) {
+		switch (bus_width) {
+		case 8:
+			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
+			break;
+		case 10:
+			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
+			break;
+		case 12:
+			cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
+			break;
+		case 16: /* No need to configure DATA_WIDTH for 16bit */
+			break;
+		default:
+			dev_warn(sdev->dev, "Unsupported bus width: %u\n",
+				 bus_width);
+			break;
+		}
+	}
+
 	if (input_interlaced)
 		cfg |= CSI_IF_CFG_SRC_TYPE_INTERLACED;
 	else
@@ -440,23 +465,6 @@  static void sun6i_csi_setup_bus(struct sun6i_csi_dev *sdev)
 		break;
 	}
 
-	switch (bus_width) {
-	case 8:
-		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_8BIT;
-		break;
-	case 10:
-		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_10BIT;
-		break;
-	case 12:
-		cfg |= CSI_IF_CFG_IF_DATA_WIDTH_12BIT;
-		break;
-	case 16: /* No need to configure DATA_WIDTH for 16bit */
-		break;
-	default:
-		dev_warn(sdev->dev, "Unsupported bus width: %u\n", bus_width);
-		break;
-	}
-
 	regmap_write(sdev->regmap, CSI_IF_CFG_REG, cfg);
 }