linux-kernel - Re: [PATCH 3/3] media: Add support for Cadence CSI2TX 2.1

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Date:   Sat, 20 Jul 2019 10:25:59 +0200
From:   Maxime Ripard <maxime.ripard@...tlin.com>
To:     Jan Kotas <jank@...ence.com>
Cc:     mchehab@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        linux-media@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 3/3] media: Add support for Cadence CSI2TX 2.1

Hi,

On Thu, Jul 18, 2019 at 12:15:09PM +0100, Jan Kotas wrote:
> This patch adds support for CSI2TX v2.1 version of the controller.
>
> Signed-off-by: Jan Kotas <jank@...ence.com>
> ---
>  drivers/media/platform/cadence/cdns-csi2tx.c | 142 +++++++++++++++++++++------
>  1 file changed, 112 insertions(+), 30 deletions(-)
>
> diff --git a/drivers/media/platform/cadence/cdns-csi2tx.c b/drivers/media/platform/cadence/cdns-csi2tx.c
> index 232259c71..e4d08acfb 100644
> --- a/drivers/media/platform/cadence/cdns-csi2tx.c
> +++ b/drivers/media/platform/cadence/cdns-csi2tx.c
> @@ -52,6 +52,17 @@
>  #define CSI2TX_STREAM_IF_CFG_REG(n)	(0x100 + (n) * 4)
>  #define CSI2TX_STREAM_IF_CFG_FILL_LEVEL(n)	((n) & 0x1f)
>
> +/* CSI2TX V2 Registers */
> +#define CSI2TX_V2_DPHY_CFG_REG			0x28
> +#define CSI2TX_V2_DPHY_CFG_RESET		BIT(16)
> +#define CSI2TX_V2_DPHY_CFG_CLOCK_MODE		BIT(10)
> +#define CSI2TX_V2_DPHY_CFG_MODE_MASK		GENMASK(9, 8)
> +#define CSI2TX_V2_DPHY_CFG_MODE_LPDT		(2 << 8)
> +#define CSI2TX_V2_DPHY_CFG_MODE_HS		(1 << 8)
> +#define CSI2TX_V2_DPHY_CFG_MODE_ULPS		(0 << 8)
> +#define CSI2TX_V2_DPHY_CFG_CLK_ENABLE		BIT(4)
> +#define CSI2TX_V2_DPHY_CFG_LANE_ENABLE(n)	BIT(n)
> +
>  #define CSI2TX_LANES_MAX	4
>  #define CSI2TX_STREAMS_MAX	4
>
> @@ -70,6 +81,13 @@ struct csi2tx_fmt {
>  	u32	bpp;
>  };
>
> +struct csi2tx_priv;
> +
> +/* CSI2TX Variant Operations */
> +struct csi2tx_vops {
> +	void (*dphy_setup)(struct csi2tx_priv *csi2tx);
> +};
> +
>  struct csi2tx_priv {
>  	struct device			*dev;
>  	unsigned int			count;
> @@ -82,6 +100,8 @@ struct csi2tx_priv {
>
>  	void __iomem			*base;
>
> +	struct csi2tx_vops		*vops;
> +
>  	struct clk			*esc_clk;
>  	struct clk			*p_clk;
>  	struct clk			*pixel_clk[CSI2TX_STREAMS_MAX];
> @@ -209,53 +229,92 @@ static const struct v4l2_subdev_pad_ops csi2tx_pad_ops = {
>  	.set_fmt	= csi2tx_set_pad_format,
>  };
>
> -static void csi2tx_reset(struct csi2tx_priv *csi2tx)
> +/* Set Wake Up value in the D-PHY */
> +static void csi2tx_dphy_set_wakeup(struct csi2tx_priv *csi2tx)
>  {
> -	writel(CSI2TX_CONFIG_SRST_REQ, csi2tx->base + CSI2TX_CONFIG_REG);
> -
> -	udelay(10);
> +	writel(CSI2TX_DPHY_CLK_WAKEUP_ULPS_CYCLES(32),
> +	       csi2tx->base + CSI2TX_DPHY_CLK_WAKEUP_REG);
>  }
>
> -static int csi2tx_start(struct csi2tx_priv *csi2tx)
> +/*
> + * Finishes the D-PHY initialization
> + * reg dphy cfg value to be used
> + */
> +static void csi2tx_dphy_init_finish(struct csi2tx_priv *csi2tx, u32 reg)
>  {
> -	struct media_entity *entity = &csi2tx->subdev.entity;
> -	struct media_link *link;
>  	unsigned int i;
> -	u32 reg;
>
> -	csi2tx_reset(csi2tx);
> +	udelay(10);
>
> -	writel(CSI2TX_CONFIG_CFG_REQ, csi2tx->base + CSI2TX_CONFIG_REG);
> +	/* Enable our (clock and data) lanes */
> +	reg |= CSI2TX_DPHY_CFG_CLK_ENABLE;
> +	for (i = 0; i < csi2tx->num_lanes; i++)
> +		reg |= CSI2TX_DPHY_CFG_LANE_ENABLE(csi2tx->lanes[i] - 1);
> +	writel(reg, csi2tx->base + CSI2TX_DPHY_CFG_REG);
>
>  	udelay(10);
>
> -	/* Configure our PPI interface with the D-PHY */
> -	writel(CSI2TX_DPHY_CLK_WAKEUP_ULPS_CYCLES(32),
> -	       csi2tx->base + CSI2TX_DPHY_CLK_WAKEUP_REG);
> +	/* Switch to HS mode */
> +	reg &= ~CSI2TX_DPHY_CFG_MODE_MASK;
> +	writel(reg | CSI2TX_DPHY_CFG_MODE_HS,
> +	       csi2tx->base + CSI2TX_DPHY_CFG_REG);
> +}
> +
> +/* Configures D-PHY in CSIv1.3 */
> +static void csi2tx_dphy_setup(struct csi2tx_priv *csi2tx)
> +{
> +	u32 reg;
> +	unsigned int i;
> +
> +	csi2tx_dphy_set_wakeup(csi2tx);
>
>  	/* Put our lanes (clock and data) out of reset */
>  	reg = CSI2TX_DPHY_CFG_CLK_RESET | CSI2TX_DPHY_CFG_MODE_LPDT;
>  	for (i = 0; i < csi2tx->num_lanes; i++)
> -		reg |= CSI2TX_DPHY_CFG_LANE_RESET(csi2tx->lanes[i]);
> +		reg |= CSI2TX_DPHY_CFG_LANE_RESET(csi2tx->lanes[i] - 1);

This looks like a separate change?

>  	writel(reg, csi2tx->base + CSI2TX_DPHY_CFG_REG);
>
> -	udelay(10);
> +	csi2tx_dphy_init_finish(csi2tx, reg);
> +}
>
> -	/* Enable our (clock and data) lanes */
> -	reg |= CSI2TX_DPHY_CFG_CLK_ENABLE;
> -	for (i = 0; i < csi2tx->num_lanes; i++)
> -		reg |= CSI2TX_DPHY_CFG_LANE_ENABLE(csi2tx->lanes[i]);

And you have a similar change here that should be in a separate patch,
with a proper explanation.

Otherwise, the rest looks good.

Maxime

--
Maxime Ripard, Bootlin
Embedded Linux and Kernel engineering
https://bootlin.com

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