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From:   Enric Balletbo i Serra <enric.balletbo@collabora.com>
Subject: Re: [PATCH v8 01/10] drm: bridge: dw_mipi_dsi: add initial regmap
 infrastructure
To:     Adrian Ratiu <adrian.ratiu@collabora.com>,
        linux-arm-kernel@lists.infradead.org, devicetree@vger.kernel.org,
        linux-rockchip@lists.infradead.org,
        Laurent Pinchart <Laurent.pinchart@ideasonboard.com>
Cc:     Andrzej Hajda <a.hajda@samsung.com>,
        Jonas Karlman <jonas@kwiboo.se>,
        Jernej Skrabec <jernej.skrabec@siol.net>,
        Heiko Stuebner <heiko@sntech.de>, linux-kernel@vger.kernel.org,
        dri-devel@lists.freedesktop.org, linux-imx@nxp.com,
        kernel@collabora.com, linux-stm32@st-md-mailman.stormreply.com,
        Enric Balletbo Serra <eballetbo@gmail.com>,
        Ezequiel Garcia <ezequiel@collabora.com>,
        Adrian Pop <pop.adrian61@gmail.com>,
        Arnaud Ferraris <arnaud.ferraris@collabora.com>
References: <20200427081952.3536741-1-adrian.ratiu@collabora.com>
 <20200427081952.3536741-2-adrian.ratiu@collabora.com>
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Date:   Mon, 27 Apr 2020 16:41:06 +0200
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Hi Adrian,

Thank you for your patch and to apply the changes I requested

On 27/4/20 10:19, Adrian Ratiu wrote:
> In order to support multiple versions of the Synopsis MIPI DSI host
> controller, which have different register layouts but almost identical
> HW protocols, we add a regmap infrastructure which can abstract away
> register accesses for platform drivers using the bridge.
> 
> The controller HW revision is detected during bridge probe which will
> be used in future commits to load the relevant register layout which
> the bridge will use transparently to the platform drivers.
> 
> Cc: Enric Balletbo Serra <eballetbo@gmail.com>
> Suggested-by: Ezequiel Garcia <ezequiel@collabora.com>
> Tested-by: Adrian Pop <pop.adrian61@gmail.com>
> Tested-by: Arnaud Ferraris <arnaud.ferraris@collabora.com>
> Signed-off-by: Adrian Ratiu <adrian.ratiu@collabora.com>

Reviewed-by: Enric Balletbo i Serra <enric.balletbo@collabora.com>

> ---
> Chnages since v7:
>   - Minor checkpatch line fix
> 
> Changes since v6:
>   - Select REGMAP_MMIO in Kconfig (Enric)
>   - Drop unnecessary stack variable inits (Enric)
>   - Make bridge error ASAP after a bad revision read (Enric)
>   - Drop redundant read of hw_version in dphy_timing_config (Enric)
> 
> New in v5.
> ---
>  drivers/gpu/drm/bridge/synopsys/Kconfig       |   1 +
>  drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 210 ++++++++++--------
>  2 files changed, 121 insertions(+), 90 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/Kconfig b/drivers/gpu/drm/bridge/synopsys/Kconfig
> index 21a1be3ced0f3..080146093b68e 100644
> --- a/drivers/gpu/drm/bridge/synopsys/Kconfig
> +++ b/drivers/gpu/drm/bridge/synopsys/Kconfig
> @@ -39,3 +39,4 @@ config DRM_DW_MIPI_DSI
>  	select DRM_KMS_HELPER
>  	select DRM_MIPI_DSI
>  	select DRM_PANEL_BRIDGE
> +	select REGMAP_MMIO
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 5ef0f154aa7bd..34b8668ae24ea 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -15,6 +15,7 @@
>  #include <linux/module.h>
>  #include <linux/of_device.h>
>  #include <linux/pm_runtime.h>
> +#include <linux/regmap.h>
>  #include <linux/reset.h>
>  
>  #include <video/mipi_display.h>
> @@ -227,6 +228,7 @@ struct dw_mipi_dsi {
>  	struct drm_bridge *panel_bridge;
>  	struct device *dev;
>  	void __iomem *base;
> +	struct regmap *regs;
>  
>  	struct clk *pclk;
>  
> @@ -235,6 +237,7 @@ struct dw_mipi_dsi {
>  	u32 lanes;
>  	u32 format;
>  	unsigned long mode_flags;
> +	u32 hw_version;
>  
>  #ifdef CONFIG_DEBUG_FS
>  	struct dentry *debugfs;
> @@ -249,6 +252,13 @@ struct dw_mipi_dsi {
>  	const struct dw_mipi_dsi_plat_data *plat_data;
>  };
>  
> +static const struct regmap_config dw_mipi_dsi_regmap_cfg = {
> +	.reg_bits = 32,
> +	.val_bits = 32,
> +	.reg_stride = 4,
> +	.name = "dw-mipi-dsi",
> +};
> +
>  /*
>   * Check if either a link to a master or slave is present
>   */
> @@ -280,16 +290,6 @@ static inline struct dw_mipi_dsi *bridge_to_dsi(struct drm_bridge *bridge)
>  	return container_of(bridge, struct dw_mipi_dsi, bridge);
>  }
>  
> -static inline void dsi_write(struct dw_mipi_dsi *dsi, u32 reg, u32 val)
> -{
> -	writel(val, dsi->base + reg);
> -}
> -
> -static inline u32 dsi_read(struct dw_mipi_dsi *dsi, u32 reg)
> -{
> -	return readl(dsi->base + reg);
> -}
> -
>  static int dw_mipi_dsi_host_attach(struct mipi_dsi_host *host,
>  				   struct mipi_dsi_device *device)
>  {
> @@ -366,8 +366,8 @@ static void dw_mipi_message_config(struct dw_mipi_dsi *dsi,
>  	if (lpm)
>  		val |= CMD_MODE_ALL_LP;
>  
> -	dsi_write(dsi, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
> -	dsi_write(dsi, DSI_CMD_MODE_CFG, val);
> +	regmap_write(dsi->regs, DSI_LPCLK_CTRL, lpm ? 0 : PHY_TXREQUESTCLKHS);
> +	regmap_write(dsi->regs, DSI_CMD_MODE_CFG, val);
>  }
>  
>  static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
> @@ -375,20 +375,20 @@ static int dw_mipi_dsi_gen_pkt_hdr_write(struct dw_mipi_dsi *dsi, u32 hdr_val)
>  	int ret;
>  	u32 val, mask;
>  
> -	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
> -				 val, !(val & GEN_CMD_FULL), 1000,
> -				 CMD_PKT_STATUS_TIMEOUT_US);
> +	ret = regmap_read_poll_timeout(dsi->regs, DSI_CMD_PKT_STATUS,
> +				       val, !(val & GEN_CMD_FULL), 1000,
> +				       CMD_PKT_STATUS_TIMEOUT_US);
>  	if (ret) {
>  		dev_err(dsi->dev, "failed to get available command FIFO\n");
>  		return ret;
>  	}
>  
> -	dsi_write(dsi, DSI_GEN_HDR, hdr_val);
> +	regmap_write(dsi->regs, DSI_GEN_HDR, hdr_val);
>  
>  	mask = GEN_CMD_EMPTY | GEN_PLD_W_EMPTY;
> -	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
> -				 val, (val & mask) == mask,
> -				 1000, CMD_PKT_STATUS_TIMEOUT_US);
> +	ret = regmap_read_poll_timeout(dsi->regs, DSI_CMD_PKT_STATUS,
> +				       val, (val & mask) == mask,
> +				       1000, CMD_PKT_STATUS_TIMEOUT_US);
>  	if (ret) {
>  		dev_err(dsi->dev, "failed to write command FIFO\n");
>  		return ret;
> @@ -409,18 +409,20 @@ static int dw_mipi_dsi_write(struct dw_mipi_dsi *dsi,
>  		if (len < pld_data_bytes) {
>  			word = 0;
>  			memcpy(&word, tx_buf, len);
> -			dsi_write(dsi, DSI_GEN_PLD_DATA, le32_to_cpu(word));
> +			regmap_write(dsi->regs, DSI_GEN_PLD_DATA,
> +				     le32_to_cpu(word));
>  			len = 0;
>  		} else {
>  			memcpy(&word, tx_buf, pld_data_bytes);
> -			dsi_write(dsi, DSI_GEN_PLD_DATA, le32_to_cpu(word));
> +			regmap_write(dsi->regs, DSI_GEN_PLD_DATA,
> +				     le32_to_cpu(word));
>  			tx_buf += pld_data_bytes;
>  			len -= pld_data_bytes;
>  		}
>  
> -		ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
> -					 val, !(val & GEN_PLD_W_FULL), 1000,
> -					 CMD_PKT_STATUS_TIMEOUT_US);
> +		ret = regmap_read_poll_timeout(dsi->regs, DSI_CMD_PKT_STATUS,
> +					       val, !(val & GEN_PLD_W_FULL),
> +					       1000, CMD_PKT_STATUS_TIMEOUT_US);
>  		if (ret) {
>  			dev_err(dsi->dev,
>  				"failed to get available write payload FIFO\n");
> @@ -441,9 +443,9 @@ static int dw_mipi_dsi_read(struct dw_mipi_dsi *dsi,
>  	u32 val;
>  
>  	/* Wait end of the read operation */
> -	ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
> -				 val, !(val & GEN_RD_CMD_BUSY),
> -				 1000, CMD_PKT_STATUS_TIMEOUT_US);
> +	ret = regmap_read_poll_timeout(dsi->regs, DSI_CMD_PKT_STATUS,
> +				       val, !(val & GEN_RD_CMD_BUSY),
> +				       1000, CMD_PKT_STATUS_TIMEOUT_US);
>  	if (ret) {
>  		dev_err(dsi->dev, "Timeout during read operation\n");
>  		return ret;
> @@ -451,15 +453,15 @@ static int dw_mipi_dsi_read(struct dw_mipi_dsi *dsi,
>  
>  	for (i = 0; i < len; i += 4) {
>  		/* Read fifo must not be empty before all bytes are read */
> -		ret = readl_poll_timeout(dsi->base + DSI_CMD_PKT_STATUS,
> -					 val, !(val & GEN_PLD_R_EMPTY),
> -					 1000, CMD_PKT_STATUS_TIMEOUT_US);
> +		ret = regmap_read_poll_timeout(dsi->regs, DSI_CMD_PKT_STATUS,
> +					       val, !(val & GEN_PLD_R_EMPTY),
> +					       1000, CMD_PKT_STATUS_TIMEOUT_US);
>  		if (ret) {
>  			dev_err(dsi->dev, "Read payload FIFO is empty\n");
>  			return ret;
>  		}
>  
> -		val = dsi_read(dsi, DSI_GEN_PLD_DATA);
> +		regmap_read(dsi->regs, DSI_GEN_PLD_DATA, &val);
>  		for (j = 0; j < 4 && j + i < len; j++)
>  			buf[i + j] = val >> (8 * j);
>  	}
> @@ -536,29 +538,29 @@ static void dw_mipi_dsi_video_mode_config(struct dw_mipi_dsi *dsi)
>  	}
>  #endif /* CONFIG_DEBUG_FS */
>  
> -	dsi_write(dsi, DSI_VID_MODE_CFG, val);
> +	regmap_write(dsi->regs, DSI_VID_MODE_CFG, val);
>  }
>  
>  static void dw_mipi_dsi_set_mode(struct dw_mipi_dsi *dsi,
>  				 unsigned long mode_flags)
>  {
> -	dsi_write(dsi, DSI_PWR_UP, RESET);
> +	regmap_write(dsi->regs, DSI_PWR_UP, RESET);
>  
>  	if (mode_flags & MIPI_DSI_MODE_VIDEO) {
> -		dsi_write(dsi, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
> +		regmap_write(dsi->regs, DSI_MODE_CFG, ENABLE_VIDEO_MODE);
>  		dw_mipi_dsi_video_mode_config(dsi);
> -		dsi_write(dsi, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
> +		regmap_write(dsi->regs, DSI_LPCLK_CTRL, PHY_TXREQUESTCLKHS);
>  	} else {
> -		dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
> +		regmap_write(dsi->regs, DSI_MODE_CFG, ENABLE_CMD_MODE);
>  	}
>  
> -	dsi_write(dsi, DSI_PWR_UP, POWERUP);
> +	regmap_write(dsi->regs, DSI_PWR_UP, POWERUP);
>  }
>  
>  static void dw_mipi_dsi_disable(struct dw_mipi_dsi *dsi)
>  {
> -	dsi_write(dsi, DSI_PWR_UP, RESET);
> -	dsi_write(dsi, DSI_PHY_RSTZ, PHY_RSTZ);
> +	regmap_write(dsi->regs, DSI_PWR_UP, RESET);
> +	regmap_write(dsi->regs, DSI_PHY_RSTZ, PHY_RSTZ);
>  }
>  
>  static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
> @@ -573,14 +575,14 @@ static void dw_mipi_dsi_init(struct dw_mipi_dsi *dsi)
>  	 */
>  	u32 esc_clk_division = (dsi->lane_mbps >> 3) / 20 + 1;
>  
> -	dsi_write(dsi, DSI_PWR_UP, RESET);
> +	regmap_write(dsi->regs, DSI_PWR_UP, RESET);
>  
>  	/*
>  	 * TODO dw drv improvements
>  	 * timeout clock division should be computed with the
>  	 * high speed transmission counter timeout and byte lane...
>  	 */
> -	dsi_write(dsi, DSI_CLKMGR_CFG, TO_CLK_DIVISION(10) |
> +	regmap_write(dsi->regs, DSI_CLKMGR_CFG, TO_CLK_DIVISION(10) |
>  		  TX_ESC_CLK_DIVISION(esc_clk_division));
>  }
>  
> @@ -609,22 +611,22 @@ static void dw_mipi_dsi_dpi_config(struct dw_mipi_dsi *dsi,
>  	if (mode->flags & DRM_MODE_FLAG_NHSYNC)
>  		val |= HSYNC_ACTIVE_LOW;
>  
> -	dsi_write(dsi, DSI_DPI_VCID, DPI_VCID(dsi->channel));
> -	dsi_write(dsi, DSI_DPI_COLOR_CODING, color);
> -	dsi_write(dsi, DSI_DPI_CFG_POL, val);
> +	regmap_write(dsi->regs, DSI_DPI_VCID, DPI_VCID(dsi->channel));
> +	regmap_write(dsi->regs, DSI_DPI_COLOR_CODING, color);
> +	regmap_write(dsi->regs, DSI_DPI_CFG_POL, val);
>  	/*
>  	 * TODO dw drv improvements
>  	 * largest packet sizes during hfp or during vsa/vpb/vfp
>  	 * should be computed according to byte lane, lane number and only
>  	 * if sending lp cmds in high speed is enable (PHY_TXREQUESTCLKHS)
>  	 */
> -	dsi_write(dsi, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4)
> +	regmap_write(dsi->regs, DSI_DPI_LP_CMD_TIM, OUTVACT_LPCMD_TIME(4)
>  		  | INVACT_LPCMD_TIME(4));
>  }
>  
>  static void dw_mipi_dsi_packet_handler_config(struct dw_mipi_dsi *dsi)
>  {
> -	dsi_write(dsi, DSI_PCKHDL_CFG, CRC_RX_EN | ECC_RX_EN | BTA_EN);
> +	regmap_write(dsi->regs, DSI_PCKHDL_CFG, CRC_RX_EN | ECC_RX_EN | BTA_EN);
>  }
>  
>  static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
> @@ -638,7 +640,7 @@ static void dw_mipi_dsi_video_packet_config(struct dw_mipi_dsi *dsi,
>  	 * non-burst video modes, see dw_mipi_dsi_video_mode_config()...
>  	 */
>  
> -	dsi_write(dsi, DSI_VID_PKT_SIZE,
> +	regmap_write(dsi->regs, DSI_VID_PKT_SIZE,
>  		       dw_mipi_is_dual_mode(dsi) ?
>  				VID_PKT_SIZE(mode->hdisplay / 2) :
>  				VID_PKT_SIZE(mode->hdisplay));
> @@ -651,14 +653,15 @@ static void dw_mipi_dsi_command_mode_config(struct dw_mipi_dsi *dsi)
>  	 * compute high speed transmission counter timeout according
>  	 * to the timeout clock division (TO_CLK_DIVISION) and byte lane...
>  	 */
> -	dsi_write(dsi, DSI_TO_CNT_CFG, HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
> +	regmap_write(dsi->regs, DSI_TO_CNT_CFG,
> +		     HSTX_TO_CNT(1000) | LPRX_TO_CNT(1000));
>  	/*
>  	 * TODO dw drv improvements
>  	 * the Bus-Turn-Around Timeout Counter should be computed
>  	 * according to byte lane...
>  	 */
> -	dsi_write(dsi, DSI_BTA_TO_CNT, 0xd00);
> -	dsi_write(dsi, DSI_MODE_CFG, ENABLE_CMD_MODE);
> +	regmap_write(dsi->regs, DSI_BTA_TO_CNT, 0xd00);
> +	regmap_write(dsi->regs, DSI_MODE_CFG, ENABLE_CMD_MODE);
>  }
>  
>  /* Get lane byte clock cycles. */
> @@ -692,13 +695,13 @@ static void dw_mipi_dsi_line_timer_config(struct dw_mipi_dsi *dsi,
>  	 * computations below may be improved...
>  	 */
>  	lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, htotal);
> -	dsi_write(dsi, DSI_VID_HLINE_TIME, lbcc);
> +	regmap_write(dsi->regs, DSI_VID_HLINE_TIME, lbcc);
>  
>  	lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hsa);
> -	dsi_write(dsi, DSI_VID_HSA_TIME, lbcc);
> +	regmap_write(dsi->regs, DSI_VID_HSA_TIME, lbcc);
>  
>  	lbcc = dw_mipi_dsi_get_hcomponent_lbcc(dsi, mode, hbp);
> -	dsi_write(dsi, DSI_VID_HBP_TIME, lbcc);
> +	regmap_write(dsi->regs, DSI_VID_HBP_TIME, lbcc);
>  }
>  
>  static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
> @@ -711,17 +714,16 @@ static void dw_mipi_dsi_vertical_timing_config(struct dw_mipi_dsi *dsi,
>  	vfp = mode->vsync_start - mode->vdisplay;
>  	vbp = mode->vtotal - mode->vsync_end;
>  
> -	dsi_write(dsi, DSI_VID_VACTIVE_LINES, vactive);
> -	dsi_write(dsi, DSI_VID_VSA_LINES, vsa);
> -	dsi_write(dsi, DSI_VID_VFP_LINES, vfp);
> -	dsi_write(dsi, DSI_VID_VBP_LINES, vbp);
> +	regmap_write(dsi->regs, DSI_VID_VACTIVE_LINES, vactive);
> +	regmap_write(dsi->regs, DSI_VID_VSA_LINES, vsa);
> +	regmap_write(dsi->regs, DSI_VID_VFP_LINES, vfp);
> +	regmap_write(dsi->regs, DSI_VID_VBP_LINES, vbp);
>  }
>  
>  static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>  {
>  	const struct dw_mipi_dsi_phy_ops *phy_ops = dsi->plat_data->phy_ops;
>  	struct dw_mipi_dsi_dphy_timing timing;
> -	u32 hw_version;
>  	int ret;
>  
>  	ret = phy_ops->get_timing(dsi->plat_data->priv_data,
> @@ -737,23 +739,22 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>  	 * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
>  	 */
>  
> -	hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> -
> -	if (hw_version >= HWVER_131) {
> -		dsi_write(dsi, DSI_PHY_TMR_CFG,
> -			  PHY_HS2LP_TIME_V131(timing.data_hs2lp) |
> -			  PHY_LP2HS_TIME_V131(timing.data_lp2hs));
> -		dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
> +	if (dsi->hw_version >= HWVER_131) {
> +		regmap_write(dsi->regs, DSI_PHY_TMR_CFG,
> +			     PHY_HS2LP_TIME_V131(timing.data_hs2lp) |
> +			     PHY_LP2HS_TIME_V131(timing.data_lp2hs));
> +		regmap_write(dsi->regs, DSI_PHY_TMR_RD_CFG,
> +			     MAX_RD_TIME_V131(10000));
>  	} else {
> -		dsi_write(dsi, DSI_PHY_TMR_CFG,
> -			  PHY_HS2LP_TIME(timing.data_hs2lp) |
> -			  PHY_LP2HS_TIME(timing.data_lp2hs) |
> -			  MAX_RD_TIME(10000));
> +		regmap_write(dsi->regs, DSI_PHY_TMR_CFG,
> +			     PHY_HS2LP_TIME(timing.data_hs2lp) |
> +			     PHY_LP2HS_TIME(timing.data_lp2hs) |
> +			     MAX_RD_TIME(10000));
>  	}
>  
> -	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG,
> -		  PHY_CLKHS2LP_TIME(timing.clk_hs2lp) |
> -		  PHY_CLKLP2HS_TIME(timing.clk_lp2hs));
> +	regmap_write(dsi->regs, DSI_PHY_TMR_LPCLK_CFG,
> +		     PHY_CLKHS2LP_TIME(timing.clk_hs2lp) |
> +		     PHY_CLKLP2HS_TIME(timing.clk_lp2hs));
>  }
>  
>  static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
> @@ -763,18 +764,18 @@ static void dw_mipi_dsi_dphy_interface_config(struct dw_mipi_dsi *dsi)
>  	 * stop wait time should be the maximum between host dsi
>  	 * and panel stop wait times
>  	 */
> -	dsi_write(dsi, DSI_PHY_IF_CFG, PHY_STOP_WAIT_TIME(0x20) |
> -		  N_LANES(dsi->lanes));
> +	regmap_write(dsi->regs, DSI_PHY_IF_CFG,
> +		     PHY_STOP_WAIT_TIME(0x20) | N_LANES(dsi->lanes));
>  }
>  
>  static void dw_mipi_dsi_dphy_init(struct dw_mipi_dsi *dsi)
>  {
>  	/* Clear PHY state */
> -	dsi_write(dsi, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
> -		  | PHY_RSTZ | PHY_SHUTDOWNZ);
> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
> -	dsi_write(dsi, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
> +	regmap_write(dsi->regs, DSI_PHY_RSTZ, PHY_DISFORCEPLL | PHY_DISABLECLK
> +		     | PHY_RSTZ | PHY_SHUTDOWNZ);
> +	regmap_write(dsi->regs, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
> +	regmap_write(dsi->regs, DSI_PHY_TST_CTRL0, PHY_TESTCLR);
> +	regmap_write(dsi->regs, DSI_PHY_TST_CTRL0, PHY_UNTESTCLR);
>  }
>  
>  static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi)
> @@ -782,27 +783,30 @@ static void dw_mipi_dsi_dphy_enable(struct dw_mipi_dsi *dsi)
>  	u32 val;
>  	int ret;
>  
> -	dsi_write(dsi, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
> -		  PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
> +	regmap_write(dsi->regs, DSI_PHY_RSTZ, PHY_ENFORCEPLL | PHY_ENABLECLK |
> +		     PHY_UNRSTZ | PHY_UNSHUTDOWNZ);
>  
> -	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS, val,
> -				 val & PHY_LOCK, 1000, PHY_STATUS_TIMEOUT_US);
> +	ret = regmap_read_poll_timeout(dsi->regs, DSI_PHY_STATUS,
> +				       val, val & PHY_LOCK,
> +				       1000, PHY_STATUS_TIMEOUT_US);
>  	if (ret)
>  		DRM_DEBUG_DRIVER("failed to wait phy lock state\n");
>  
> -	ret = readl_poll_timeout(dsi->base + DSI_PHY_STATUS,
> -				 val, val & PHY_STOP_STATE_CLK_LANE, 1000,
> -				 PHY_STATUS_TIMEOUT_US);
> +	ret = regmap_read_poll_timeout(dsi->regs, DSI_PHY_STATUS,
> +				       val, val & PHY_STOP_STATE_CLK_LANE, 1000,
> +				       PHY_STATUS_TIMEOUT_US);
>  	if (ret)
>  		DRM_DEBUG_DRIVER("failed to wait phy clk lane stop state\n");
>  }
>  
>  static void dw_mipi_dsi_clear_err(struct dw_mipi_dsi *dsi)
>  {
> -	dsi_read(dsi, DSI_INT_ST0);
> -	dsi_read(dsi, DSI_INT_ST1);
> -	dsi_write(dsi, DSI_INT_MSK0, 0);
> -	dsi_write(dsi, DSI_INT_MSK1, 0);
> +	u32 val;
> +
> +	regmap_read(dsi->regs, DSI_INT_ST0, &val);
> +	regmap_read(dsi->regs, DSI_INT_ST1, &val);
> +	regmap_write(dsi->regs, DSI_INT_MSK0, 0);
> +	regmap_write(dsi->regs, DSI_INT_MSK1, 0);
>  }
>  
>  static void dw_mipi_dsi_bridge_post_disable(struct drm_bridge *bridge)
> @@ -989,6 +993,18 @@ static void dw_mipi_dsi_debugfs_remove(struct dw_mipi_dsi *dsi) { }
>  
>  #endif /* CONFIG_DEBUG_FS */
>  
> +static int dw_mipi_dsi_get_hw_version(struct dw_mipi_dsi *dsi)
> +{
> +	regmap_read(dsi->regs, DSI_VERSION, &dsi->hw_version);
> +	dsi->hw_version &= VERSION;
> +	if (!dsi->hw_version) {
> +		dev_err(dsi->dev,
> +			"Failed to read DSI version. Is pclk enabled?\n");
> +		return -ENODEV;
> +	}
> +	return 0;
> +}
> +
>  static struct dw_mipi_dsi *
>  __dw_mipi_dsi_probe(struct platform_device *pdev,
>  		    const struct dw_mipi_dsi_plat_data *plat_data)
> @@ -1020,6 +1036,14 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>  		dsi->base = plat_data->base;
>  	}
>  
> +	dsi->regs = devm_regmap_init_mmio(dev, dsi->base,
> +					  &dw_mipi_dsi_regmap_cfg);
> +	if (IS_ERR(dsi->regs)) {
> +		ret = PTR_ERR(dsi->regs);
> +		DRM_ERROR("Failed to create DW MIPI DSI regmap: %d\n", ret);
> +		return ERR_PTR(ret);
> +	}
> +
>  	dsi->pclk = devm_clk_get(dev, "pclk");
>  	if (IS_ERR(dsi->pclk)) {
>  		ret = PTR_ERR(dsi->pclk);
> @@ -1055,6 +1079,12 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>  		clk_disable_unprepare(dsi->pclk);
>  	}
>  
> +	ret = dw_mipi_dsi_get_hw_version(dsi);
> +	if (ret) {
> +		dev_err(dev, "Could not read HW version\n");
> +		return ERR_PTR(ret);
> +	}
> +
>  	dw_mipi_dsi_debugfs_init(dsi);
>  	pm_runtime_enable(dev);
>  
>