LinuxTV Patchwork [v3] rcar-csi2: Propagate the FLD signal for NTSC and PAL

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Submitter Niklas Söderlund
Date March 12, 2019, 11:49 p.m.
Message ID <20190312234955.23310-1-niklas.soderlund+renesas@ragnatech.se>
Download mbox | patch
Permalink /patch/55011/
State New
Delegated to: Hans Verkuil
Headers show

Comments

Niklas Söderlund - March 12, 2019, 11:49 p.m.
Depending on which video standard is used the driver needs to setup the
hardware to correctly handle fields. If stream is identified as NTSC
or PAL setup field detection and propagate the field detection signal.

Later versions of the datasheet have been updated to make it clear
that FLD register should be set to 0 when dealing with non-interlaced
field formats.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
---
 drivers/media/platform/rcar-vin/rcar-csi2.c | 16 +++++++++++++---
 1 file changed, 13 insertions(+), 3 deletions(-)
---
Hi,

This patch depends on '[PATCH v3 0/2] rcar-csi2: Use standby mode 
instead of resetting'.

* Changes since v2
- Set FLD_DET_SEL = 01
Laurent Pinchart - March 13, 2019, 12:13 a.m.
Hi Niklas,

Thank you for the patch.

On Wed, Mar 13, 2019 at 12:49:55AM +0100, Niklas Söderlund wrote:
> Depending on which video standard is used the driver needs to setup the
> hardware to correctly handle fields. If stream is identified as NTSC
> or PAL setup field detection and propagate the field detection signal.
> 
> Later versions of the datasheet have been updated to make it clear
> that FLD register should be set to 0 when dealing with non-interlaced
> field formats.
> 
> Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
> ---
>  drivers/media/platform/rcar-vin/rcar-csi2.c | 16 +++++++++++++---
>  1 file changed, 13 insertions(+), 3 deletions(-)
> ---
> Hi,
> 
> This patch depends on '[PATCH v3 0/2] rcar-csi2: Use standby mode 
> instead of resetting'.
> 
> * Changes since v2
> - Set FLD_DET_SEL = 01
> 
> diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
> index 10f1b4978ed7dcc6..6c7c7e6072ffb09e 100644
> --- a/drivers/media/platform/rcar-vin/rcar-csi2.c
> +++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
> @@ -68,6 +68,7 @@ struct rcar_csi2;
>  /* Field Detection Control */
>  #define FLD_REG				0x1c
>  #define FLD_FLD_NUM(n)			(((n) & 0xff) << 16)
> +#define FLD_DET_SEL(n)			(((n) & 0x3) << 4)
>  #define FLD_FLD_EN4			BIT(3)
>  #define FLD_FLD_EN3			BIT(2)
>  #define FLD_FLD_EN2			BIT(1)
> @@ -475,7 +476,7 @@ static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp)
>  static int rcsi2_start_receiver(struct rcar_csi2 *priv)
>  {
>  	const struct rcar_csi2_format *format;
> -	u32 phycnt, vcdt = 0, vcdt2 = 0;
> +	u32 phycnt, vcdt = 0, vcdt2 = 0, fld = 0;
>  	unsigned int i;
>  	int mbps, ret;
>  
> @@ -507,6 +508,16 @@ static int rcsi2_start_receiver(struct rcar_csi2 *priv)
>  			vcdt2 |= vcdt_part << ((i % 2) * 16);
>  	}
>  
> +	if (priv->mf.field == V4L2_FIELD_ALTERNATE) {
> +		fld = FLD_DET_SEL(1) | FLD_FLD_EN4 | FLD_FLD_EN3 | FLD_FLD_EN2
> +			| FLD_FLD_EN;
> +
> +		if (priv->mf.height == 240)
> +			fld |= FLD_FLD_NUM(2);

Should this be FLD_FLD_NUM(0) ? It won't make a difference in practice
as FLD_DET_SEL(1) ensures that only bit 0 is taken into account, but I
think the intent would be clearer (and the compiler will optimize it out
as FLD_FLD_NUM(0) == 0).

> +		else
> +			fld |= FLD_FLD_NUM(1);
> +	}
> +
>  	phycnt = PHYCNT_ENABLECLK;
>  	phycnt |= (1 << priv->lanes) - 1;
>  
> @@ -519,8 +530,7 @@ static int rcsi2_start_receiver(struct rcar_csi2 *priv)
>  	rcsi2_write(priv, PHTC_REG, 0);
>  
>  	/* Configure */
> -	rcsi2_write(priv, FLD_REG, FLD_FLD_NUM(2) | FLD_FLD_EN4 |
> -		    FLD_FLD_EN3 | FLD_FLD_EN2 | FLD_FLD_EN);
> +	rcsi2_write(priv, FLD_REG, fld);
>  	rcsi2_write(priv, VCDT_REG, vcdt);
>  	if (vcdt2)
>  		rcsi2_write(priv, VCDT2_REG, vcdt2);

Patch

diff --git a/drivers/media/platform/rcar-vin/rcar-csi2.c b/drivers/media/platform/rcar-vin/rcar-csi2.c
index 10f1b4978ed7dcc6..6c7c7e6072ffb09e 100644
--- a/drivers/media/platform/rcar-vin/rcar-csi2.c
+++ b/drivers/media/platform/rcar-vin/rcar-csi2.c
@@ -68,6 +68,7 @@  struct rcar_csi2;
 /* Field Detection Control */
 #define FLD_REG				0x1c
 #define FLD_FLD_NUM(n)			(((n) & 0xff) << 16)
+#define FLD_DET_SEL(n)			(((n) & 0x3) << 4)
 #define FLD_FLD_EN4			BIT(3)
 #define FLD_FLD_EN3			BIT(2)
 #define FLD_FLD_EN2			BIT(1)
@@ -475,7 +476,7 @@  static int rcsi2_calc_mbps(struct rcar_csi2 *priv, unsigned int bpp)
 static int rcsi2_start_receiver(struct rcar_csi2 *priv)
 {
 	const struct rcar_csi2_format *format;
-	u32 phycnt, vcdt = 0, vcdt2 = 0;
+	u32 phycnt, vcdt = 0, vcdt2 = 0, fld = 0;
 	unsigned int i;
 	int mbps, ret;
 
@@ -507,6 +508,16 @@  static int rcsi2_start_receiver(struct rcar_csi2 *priv)
 			vcdt2 |= vcdt_part << ((i % 2) * 16);
 	}
 
+	if (priv->mf.field == V4L2_FIELD_ALTERNATE) {
+		fld = FLD_DET_SEL(1) | FLD_FLD_EN4 | FLD_FLD_EN3 | FLD_FLD_EN2
+			| FLD_FLD_EN;
+
+		if (priv->mf.height == 240)
+			fld |= FLD_FLD_NUM(2);
+		else
+			fld |= FLD_FLD_NUM(1);
+	}
+
 	phycnt = PHYCNT_ENABLECLK;
 	phycnt |= (1 << priv->lanes) - 1;
 
@@ -519,8 +530,7 @@  static int rcsi2_start_receiver(struct rcar_csi2 *priv)
 	rcsi2_write(priv, PHTC_REG, 0);
 
 	/* Configure */
-	rcsi2_write(priv, FLD_REG, FLD_FLD_NUM(2) | FLD_FLD_EN4 |
-		    FLD_FLD_EN3 | FLD_FLD_EN2 | FLD_FLD_EN);
+	rcsi2_write(priv, FLD_REG, fld);
 	rcsi2_write(priv, VCDT_REG, vcdt);
 	if (vcdt2)
 		rcsi2_write(priv, VCDT2_REG, vcdt2);

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