linux-kernel - [PATCH] drm/bridge: cdns-dsi: Add support for J721E wrapper

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Date:   Wed, 15 Jun 2022 17:02:18 +0530
From:   Rahul T R <r-ravikumar@...com>
To:     <dri-devel@...ts.freedesktop.org>
CC:     <andrzej.hajda@...el.com>, <narmstrong@...libre.com>,
        <robert.foss@...aro.org>, <jonas@...boo.se>,
        <jernej.skrabec@...il.com>, <airlied@...ux.ie>, <daniel@...ll.ch>,
        <p.zabel@...gutronix.de>, <tomi.valkeinen@...asonboard.com>,
        <laurent.pinchart@...asonboard.com>,
        <linux-kernel@...r.kernel.org>, <jpawar@...ence.com>,
        <sjakhade@...ence.com>, <mparab@...ence.com>, <a-bhatia1@...com>,
        Rahul T R <r-ravikumar@...com>
Subject: [PATCH] drm/bridge: cdns-dsi: Add support for J721E wrapper

Add support for wrapper settings for DSI bridge on
j721e. Also set the DPI input to DPI0

Signed-off-by: Rahul T R <r-ravikumar@...com>
---
 drivers/gpu/drm/bridge/Kconfig    | 10 ++++++++++
 drivers/gpu/drm/bridge/cdns-dsi.c | 24 ++++++++++++++++++++++++
 2 files changed, 34 insertions(+)

diff --git a/drivers/gpu/drm/bridge/Kconfig b/drivers/gpu/drm/bridge/Kconfig
index 8ffd601e68f9..72c4c962d752 100644
--- a/drivers/gpu/drm/bridge/Kconfig
+++ b/drivers/gpu/drm/bridge/Kconfig
@@ -26,6 +26,16 @@ config DRM_CDNS_DSI
 	  Support Cadence DPI to DSI bridge. This is an internal
 	  bridge and is meant to be directly embedded in a SoC.
 
+if DRM_CDNS_DSI
+
+config DRM_CDNS_DSI_J721E
+	bool "J721E Cadence DPI/DSI wrapper support"
+	default y
+	help
+	  Support J721E Cadence DPI/DSI wrapper. This wrapper adds
+	  support to select which DPI input to use for the bridge.
+endif
+
 config DRM_CHIPONE_ICN6211
 	tristate "Chipone ICN6211 MIPI-DSI/RGB Converter bridge"
 	depends on OF
diff --git a/drivers/gpu/drm/bridge/cdns-dsi.c b/drivers/gpu/drm/bridge/cdns-dsi.c
index 20bece84ff8c..d6f99963b7e2 100644
--- a/drivers/gpu/drm/bridge/cdns-dsi.c
+++ b/drivers/gpu/drm/bridge/cdns-dsi.c
@@ -424,6 +424,16 @@
 #define DSI_NULL_FRAME_OVERHEAD		6
 #define DSI_EOT_PKT_SIZE		4
 
+#define DSI_WRAP_REVISION		0x0
+#define DSI_WRAP_DPI_CONTROL		0x4
+#define DSI_WRAP_DSC_CONTROL		0x8
+#define DSI_WRAP_DPI_SECURE		0xc
+#define DSI_WRAP_DSI_0_ASF_STATUS	0x10
+
+#define DSI_WRAP_DPI_0_EN		BIT(0)
+#define DSI_WRAP_DSI2_MUX_SEL		BIT(4)
+
+
 struct cdns_dsi_output {
 	struct mipi_dsi_device *dev;
 	struct drm_panel *panel;
@@ -453,6 +463,9 @@ struct cdns_dsi_input {
 struct cdns_dsi {
 	struct mipi_dsi_host base;
 	void __iomem *regs;
+#ifdef CONFIG_DRM_CDNS_DSI_J721E
+	void __iomem *wrap_regs;
+#endif
 	struct cdns_dsi_input input;
 	struct cdns_dsi_output output;
 	unsigned int direct_cmd_fifo_depth;
@@ -1212,6 +1225,12 @@ static int cdns_dsi_drm_probe(struct platform_device *pdev)
 	if (IS_ERR(dsi->regs))
 		return PTR_ERR(dsi->regs);
 
+#ifdef CONFIG_DRM_CDNS_DSI_J721E
+	dsi->wrap_regs = devm_platform_ioremap_resource(pdev, 1);
+	if (IS_ERR(dsi->wrap_regs))
+		return PTR_ERR(dsi->wrap_regs);
+#endif
+
 	dsi->dsi_p_clk = devm_clk_get(&pdev->dev, "dsi_p_clk");
 	if (IS_ERR(dsi->dsi_p_clk))
 		return PTR_ERR(dsi->dsi_p_clk);
@@ -1244,6 +1263,11 @@ static int cdns_dsi_drm_probe(struct platform_device *pdev)
 		goto err_disable_pclk;
 	}
 
+#ifdef CONFIG_DRM_CDNS_DSI_J721E
+	/* Select DPI0 as input */
+	writel(DSI_WRAP_DPI_0_EN, dsi->wrap_regs + DSI_WRAP_DPI_CONTROL);
+#endif
+
 	val = readl(dsi->regs + IP_CONF);
 	dsi->direct_cmd_fifo_depth = 1 << (DIRCMD_FIFO_DEPTH(val) + 2);
 	dsi->rx_fifo_depth = RX_FIFO_DEPTH(val);
-- 
2.36.1