[PATCH] drm/bridge/synopsys: dsi: Add 1.31 version support

[Philippe CORNU]

Hi Archit, Andrzej, Laurent & Brian,

What is your opinion regarding this patch? Do you have any advice for 
handling hw versions?

Do not hesitate to comment.

Many thanks,
Philippe :-)


On 01/22/2018 04:08 PM, Philippe Cornu wrote:
> From: Philippe CORNU <philippe.cornu at st.com>
> 
> Add support for the Synopsys DesignWare MIPI DSI version 1.31
> Two registers need to be updated/added for supporting 1.31:
> * PHY_TMR_CFG 0x9c (updated)
>    1.30 [31:24] phy_hs2lp_time
>         [23:16] phy_lp2hs_time
>         [14: 0] max_rd_time
> 
>    1.31 [25:16] phy_hs2lp_time
>         [ 9: 0] phy_lp2hs_time
> 
> * PHY_TMR_RD_CFG 0xf4 (new)
>    1.31 [14: 0] max_rd_time
> 
> Signed-off-by: Philippe Cornu <philippe.cornu at st.com>
> ---
>   drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c | 52 +++++++++++++++++++++++----
>   1 file changed, 46 insertions(+), 6 deletions(-)
> 
> diff --git a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> index 735f38429c06..20a2ca14a7ad 100644
> --- a/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> +++ b/drivers/gpu/drm/bridge/synopsys/dw-mipi-dsi.c
> @@ -25,7 +25,13 @@
>   #include <drm/bridge/dw_mipi_dsi.h>
>   #include <video/mipi_display.h>
>   
> +#define HWVER_130			0x31333000	/* IP version 1.30 */
> +#define HWVER_131			0x31333100	/* IP version 1.31 */
> +#define HWVER_OLDEST			HWVER_130
> +#define HWVER_NEWEST			HWVER_131
> +
>   #define DSI_VERSION			0x00
> +#define VERSION				GENMASK(31, 8)
>   
>   #define DSI_PWR_UP			0x04
>   #define RESET				0
> @@ -161,11 +167,12 @@
>   #define PHY_CLKHS2LP_TIME(lbcc)		(((lbcc) & 0x3ff) << 16)
>   #define PHY_CLKLP2HS_TIME(lbcc)		((lbcc) & 0x3ff)
>   
> -/* TODO Next register is slightly different between 1.30 & 1.31 IP version */
>   #define DSI_PHY_TMR_CFG			0x9c
> -#define PHY_HS2LP_TIME(lbcc)		(((lbcc) & 0xff) << 24)
> -#define PHY_LP2HS_TIME(lbcc)		(((lbcc) & 0xff) << 16)
> -#define MAX_RD_TIME(lbcc)		((lbcc) & 0x7fff)
> +#define PHY_HS2LP_TIME_V130(lbcc)	(((lbcc) & 0xff) << 24)
> +#define PHY_LP2HS_TIME_V130(lbcc)	(((lbcc) & 0xff) << 16)
> +#define MAX_RD_TIME_V130(lbcc)		((lbcc) & 0x7fff)
> +#define PHY_HS2LP_TIME_V131(lbcc)	(((lbcc) & 0x3ff) << 16)
> +#define PHY_LP2HS_TIME_V131(lbcc)	((lbcc) & 0x3ff)
>   
>   #define DSI_PHY_RSTZ			0xa0
>   #define PHY_DISFORCEPLL			0
> @@ -204,7 +211,9 @@
>   #define DSI_INT_ST1			0xc0
>   #define DSI_INT_MSK0			0xc4
>   #define DSI_INT_MSK1			0xc8
> +
>   #define DSI_PHY_TMR_RD_CFG		0xf4
> +#define MAX_RD_TIME_V131(lbcc)		((lbcc) & 0x7fff)
>   
>   #define PHY_STATUS_TIMEOUT_US		10000
>   #define CMD_PKT_STATUS_TIMEOUT_US	20000
> @@ -215,6 +224,7 @@ struct dw_mipi_dsi {
>   	struct drm_bridge *panel_bridge;
>   	struct device *dev;
>   	void __iomem *base;
> +	u32 hw_version;
>   
>   	struct clk *pclk;
>   	struct clk *px_clk;
> @@ -616,8 +626,14 @@ static void dw_mipi_dsi_dphy_timing_config(struct dw_mipi_dsi *dsi)
>   	 * note: DSI_PHY_TMR_CFG.MAX_RD_TIME should be in line with
>   	 * DSI_CMD_MODE_CFG.MAX_RD_PKT_SIZE_LP (see CMD_MODE_ALL_LP)
>   	 */
> -	dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME(0x40)
> -		  | PHY_LP2HS_TIME(0x40) | MAX_RD_TIME(10000));
> +	if (dsi->hw_version == HWVER_131) {
> +		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V131(0x40) |
> +			  PHY_LP2HS_TIME_V131(0x40));
> +		dsi_write(dsi, DSI_PHY_TMR_RD_CFG, MAX_RD_TIME_V131(10000));
> +	} else {
> +		dsi_write(dsi, DSI_PHY_TMR_CFG, PHY_HS2LP_TIME_V130(0x40) |
> +			  PHY_LP2HS_TIME_V130(0x40) | MAX_RD_TIME_V130(10000));
> +	}
>   
>   	dsi_write(dsi, DSI_PHY_TMR_LPCLK_CFG, PHY_CLKHS2LP_TIME(0x40)
>   		  | PHY_CLKLP2HS_TIME(0x40));
> @@ -791,6 +807,28 @@ static const struct drm_bridge_funcs dw_mipi_dsi_bridge_funcs = {
>   	.attach	      = dw_mipi_dsi_bridge_attach,
>   };
>   
> +static void dsi_get_version(struct dw_mipi_dsi *dsi)
> +{
> +	u32 hw_version;
> +
> +	clk_prepare_enable(dsi->pclk);
> +	hw_version = dsi_read(dsi, DSI_VERSION) & VERSION;
> +	clk_disable_unprepare(dsi->pclk);
> +
> +	if (hw_version > HWVER_NEWEST) {
> +		DRM_DEBUG("hw version: use 0x%08x for this recent 0x%08x\n",
> +			  HWVER_NEWEST, hw_version);
> +		hw_version = HWVER_NEWEST;
> +
> +	} else if (hw_version < HWVER_OLDEST) {
> +		DRM_DEBUG("hw version: use 0x%08x for this old 0x%08x\n",
> +			  HWVER_OLDEST, hw_version);
> +		hw_version = HWVER_OLDEST;
> +	}
> +
> +	dsi->hw_version = hw_version;
> +}
> +
>   static struct dw_mipi_dsi *
>   __dw_mipi_dsi_probe(struct platform_device *pdev,
>   		    const struct dw_mipi_dsi_plat_data *plat_data)
> @@ -870,6 +908,8 @@ __dw_mipi_dsi_probe(struct platform_device *pdev,
>   		clk_disable_unprepare(dsi->pclk);
>   	}
>   
> +	dsi_get_version(dsi);
> +
>   	pm_runtime_enable(dev);
>   
>   	dsi->dsi_host.ops = &dw_mipi_dsi_host_ops;
>