linux-kernel - Re: [PATCH] phy: cadence: cdns-dphy-rx: Add common module reset support

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Date:   Mon, 20 Mar 2023 12:03:37 +0530
From:   Jai Luthra <j-luthra@...com>
To:     Vaishnav Achath <vaishnav.a@...com>
CC:     <linux-phy@...ts.infradead.org>, <vkoul@...nel.org>,
        <kishon@...nel.org>, <linux-kernel@...r.kernel.org>,
        <devarsht@...com>, <tomi.valkeinen@...asonboard.com>,
        <praneeth@...com>, <u-kumar1@...com>, <vigneshr@...com>,
        <nm@...com>, <sinthu.raja@...com>
Subject: Re: [PATCH] phy: cadence: cdns-dphy-rx: Add common module reset
 support

Hi,

On Mar 14, 2023 at 13:01:37 +0530, Vaishnav Achath wrote:
> From: Sinthu Raja <sinthu.raja@...com>
> 
> DPHY RX module has a common module reset (RSTB_CMN) which is expected
> to be released during configuration. In J721E SR1.0 the RSTB_CMN is
> internally tied to CSI_RX_RST and is hardware controlled, for all
> other newer platforms the common module reset is software controlled.
> Add support to control common module reset during configuration and
> also skip common module reset based on soc_device_match() for J721E SR1.0.
> 
> Signed-off-by: Sinthu Raja <sinthu.raja@...com>
> Co-developed-by: Vaishnav Achath <vaishnav.a@...com>
> Signed-off-by: Vaishnav Achath <vaishnav.a@...com>

Reviewed-by: Jai Luthra <j-luthra@...com>

> ---
> 
> Tested on J721E SR1.0 and SR 1.1 by CSI2RX streaming,
> without this changes CSI2RX streaming fails on J721E SR1.1
> and all other newer TI platforms (J721S2, J784S4, AM62X).
> 
> Logs: https://gist.github.com/vaishnavachath/3ecda7de0e63b13c6f765ae2c4f9c5ff
> 
>  drivers/phy/cadence/cdns-dphy-rx.c | 32 ++++++++++++++++++++++++++++++
>  1 file changed, 32 insertions(+)
> 
> diff --git a/drivers/phy/cadence/cdns-dphy-rx.c b/drivers/phy/cadence/cdns-dphy-rx.c
> index 572c70089a94..c05b043893a9 100644
> --- a/drivers/phy/cadence/cdns-dphy-rx.c
> +++ b/drivers/phy/cadence/cdns-dphy-rx.c
> @@ -11,10 +11,12 @@
>  #include <linux/phy/phy.h>
>  #include <linux/phy/phy-mipi-dphy.h>
>  #include <linux/platform_device.h>
> +#include <linux/sys_soc.h>
>  
>  #define DPHY_PMA_CMN(reg)		(reg)
>  #define DPHY_PCS(reg)			(0xb00 + (reg))
>  #define DPHY_ISO(reg)			(0xc00 + (reg))
> +#define DPHY_WRAP(reg)			(0x1000 + (reg))
>  
>  #define DPHY_CMN_SSM			DPHY_PMA_CMN(0x20)
>  #define DPHY_CMN_RX_MODE_EN		BIT(10)
> @@ -33,6 +35,9 @@
>  #define DPHY_POWER_ISLAND_EN_CLK	DPHY_PCS(0xc)
>  #define DPHY_POWER_ISLAND_EN_CLK_VAL	0xaa
>  
> +#define DPHY_LANE			DPHY_WRAP(0x0)
> +#define DPHY_LANE_RESET_CMN_EN		BIT(23)
> +
>  #define DPHY_ISO_CL_CTRL_L		DPHY_ISO(0x10)
>  #define DPHY_ISO_DL_CTRL_L0		DPHY_ISO(0x14)
>  #define DPHY_ISO_DL_CTRL_L1		DPHY_ISO(0x20)
> @@ -57,6 +62,10 @@ struct cdns_dphy_rx_band {
>  	unsigned int max_rate;
>  };
>  
> +struct cdns_dphy_soc_data {
> +	bool has_hw_cmn_rstb;
> +};
> +
>  /* Order of bands is important since the index is the band number. */
>  static const struct cdns_dphy_rx_band bands[] = {
>  	{ 80, 100 }, { 100, 120 }, { 120, 160 }, { 160, 200 }, { 200, 240 },
> @@ -142,13 +151,36 @@ static int cdns_dphy_rx_wait_lane_ready(struct cdns_dphy_rx *dphy,
>  	return 0;
>  }
>  
> +static struct cdns_dphy_soc_data j721e_soc_data = {
> +	.has_hw_cmn_rstb = true,
> +};
> +
> +static const struct soc_device_attribute cdns_dphy_socinfo[] = {
> +	{
> +		.family = "J721E",
> +		.revision = "SR1.0",
> +		.data = &j721e_soc_data,
> +	},
> +	{/* sentinel */}
> +};
> +
>  static int cdns_dphy_rx_configure(struct phy *phy,
>  				  union phy_configure_opts *opts)
>  {
>  	struct cdns_dphy_rx *dphy = phy_get_drvdata(phy);
>  	unsigned int reg, lanes = opts->mipi_dphy.lanes;
> +	const struct cdns_dphy_soc_data *soc_data = NULL;
> +	const struct soc_device_attribute *soc;
>  	int band_ctrl, ret;
>  
> +	soc = soc_device_match(cdns_dphy_socinfo);
> +	if (soc && soc->data)
> +		soc_data = soc->data;
> +	if (!soc || (soc_data && !soc_data->has_hw_cmn_rstb)) {
> +		reg = DPHY_LANE_RESET_CMN_EN;
> +		writel(reg, dphy->regs + DPHY_LANE);
> +	}
> +
>  	/* Data lanes. Minimum one lane is mandatory. */
>  	if (lanes < DPHY_LANES_MIN || lanes > DPHY_LANES_MAX)
>  		return -EINVAL;
> -- 
> 2.17.1
> 

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