[PATCH v5 5/5] drm/bridge: cdns-dsi: Add support for J721E wrapper

Rahul T R
2022-07-06T11:41:34Z

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@ti.com>
---
drivers/gpu/drm/bridge/cadence/Kconfig | 10 ++++
drivers/gpu/drm/bridge/cadence/Makefile | 1 +
.../gpu/drm/bridge/cadence/cdns-dsi-core.c | 37 +++++++++++++-
.../gpu/drm/bridge/cadence/cdns-dsi-core.h | 13 +++++
.../gpu/drm/bridge/cadence/cdns-dsi-j721e.c | 51 +++++++++++++++++++
.../gpu/drm/bridge/cadence/cdns-dsi-j721e.h | 18 +++++++
6 files changed, 129 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.c
create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.h

diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig b/drivers/gpu/drm/bridge/cadence/Kconfig
index 8fbb46c66094..663a02d96420 100644
--- a/drivers/gpu/drm/bridge/cadence/Kconfig
+++ b/drivers/gpu/drm/bridge/cadence/Kconfig
@@ -36,3 +36,13 @@ config DRM_CDNS_DSI
help
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
diff --git a/drivers/gpu/drm/bridge/cadence/Makefile b/drivers/gpu/drm/bridge/cadence/Makefile
index e3d8e9a40784..4cffc8ff71c4 100644
--- a/drivers/gpu/drm/bridge/cadence/Makefile
+++ b/drivers/gpu/drm/bridge/cadence/Makefile
@@ -4,3 +4,4 @@ cdns-mhdp8546-y := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o
cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) += cdns-mhdp8546-j721e.o
obj-$(CONFIG_DRM_CDNS_DSI) += cdns-dsi.o
cdns-dsi-y := cdns-dsi-core.o
+cdns-dsi-$(CONFIG_DRM_CDNS_DSI_J721E) += cdns-dsi-j721e.o
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
index cba91247ab26..4b7de38ef1b0 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -15,12 +15,16 @@
#include <linux/iopoll.h>
#include <linux/module.h>
#include <linux/of_address.h>
+#include <linux/of_device.h>
#include <linux/of_graph.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
#include <linux/reset.h>

#include "cdns-dsi-core.h"
+#ifdef CONFIG_DRM_CDNS_DSI_J721E
+#include "cdns-dsi-j721e.h"
+#endif

static inline struct cdns_dsi *input_to_dsi(struct cdns_dsi_input *input)
{
@@ -265,6 +269,10 @@ static void cdns_dsi_bridge_disable(struct drm_bridge *bridge)

val = readl(dsi->regs + MCTL_MAIN_EN) & ~IF_EN(input->id);
writel(val, dsi->regs + MCTL_MAIN_EN);
+
+ if (dsi->platform_ops && dsi->platform_ops->disable)
+ dsi->platform_ops->disable(dsi);
+
pm_runtime_put(dsi->base.dev);
}

@@ -360,6 +368,9 @@ static void cdns_dsi_bridge_enable(struct drm_bridge *bridge)
if (WARN_ON(pm_runtime_get_sync(dsi->base.dev) < 0))
return;

+ if (dsi->platform_ops && dsi->platform_ops->enable)
+ dsi->platform_ops->enable(dsi);
+
mode = &bridge->encoder->crtc->state->adjusted_mode;
nlanes = output->dev->lanes;

@@ -800,6 +811,8 @@ static int cdns_dsi_drm_probe(struct platform_device *pdev)
goto err_disable_pclk;
}

+ dsi->platform_ops = of_device_get_match_data(&pdev->dev);
+
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);
@@ -835,14 +848,27 @@ static int cdns_dsi_drm_probe(struct platform_device *pdev)
dsi->base.dev = &pdev->dev;
dsi->base.ops = &cdns_dsi_ops;

+ if (dsi->platform_ops && dsi->platform_ops->init) {
+ ret = dsi->platform_ops->init(dsi);
+ if (ret != 0) {
+ dev_err(&pdev->dev, "platform initialization failed: %d\n",
+ ret);
+ goto err_disable_runtime_pm;
+ }
+ }
+
ret = mipi_dsi_host_register(&dsi->base);
if (ret)
- goto err_disable_runtime_pm;
+ goto err_deinit_platform;

clk_disable_unprepare(dsi->dsi_p_clk);

return 0;

+err_deinit_platform:
+ if (dsi->platform_ops && dsi->platform_ops->exit)
+ dsi->platform_ops->exit(dsi);
+
err_disable_runtime_pm:
pm_runtime_disable(&pdev->dev);

@@ -857,6 +883,10 @@ static int cdns_dsi_drm_remove(struct platform_device *pdev)
struct cdns_dsi *dsi = platform_get_drvdata(pdev);

mipi_dsi_host_unregister(&dsi->base);
+
+ if (dsi->platform_ops && dsi->platform_ops->exit)
+ dsi->platform_ops->exit(dsi);
+
pm_runtime_disable(&pdev->dev);

return 0;
@@ -864,6 +894,11 @@ static int cdns_dsi_drm_remove(struct platform_device *pdev)

static const struct of_device_id cdns_dsi_of_match[] = {
{ .compatible = "cdns,dsi" },
+#ifdef CONFIG_DRM_CDNS_DSI_J721E
+ { .compatible = "ti,j721e-dsi",
+ .data = &dsi_ti_j721e_ops,
+ },
+#endif
{ },
};
MODULE_DEVICE_TABLE(of, cdns_dsi_of_match);
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
index 65cc77f19b39..37568b547fbe 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
@@ -439,9 +439,22 @@ struct cdns_dsi_input {
struct drm_bridge bridge;
};

+struct cdns_dsi;
+
+struct dsi_platform_ops {
+ int (*init)(struct cdns_dsi *dsi);
+ void (*exit)(struct cdns_dsi *dsi);
+ void (*enable)(struct cdns_dsi *dsi);
+ void (*disable)(struct cdns_dsi *dsi);
+};
+
struct cdns_dsi {
struct mipi_dsi_host base;
void __iomem *regs;
+#ifdef CONFIG_DRM_CDNS_DSI_J721E
+ void __iomem *j721e_regs;
+#endif
+ const struct dsi_platform_ops *platform_ops;
struct cdns_dsi_input input;
struct cdns_dsi_output output;
unsigned int direct_cmd_fifo_depth;
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.c
new file mode 100644
index 000000000000..b5216acb333e
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.c
@@ -0,0 +1,51 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * TI j721e Cadence DSI wrapper
+ *
+ * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: Rahul T R <r-ravikumar@ti.com>
+ */
+
+#include <linux/io.h>
+#include <linux/platform_device.h>
+
+#include "cdns-dsi-j721e.h"
+
+#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)
+
+static int cdns_dsi_j721e_init(struct cdns_dsi *dsi)
+{
+ struct platform_device *pdev = to_platform_device(dsi->base.dev);
+
+ dsi->j721e_regs = devm_platform_ioremap_resource(pdev, 1);
+ return PTR_ERR_OR_ZERO(dsi->j721e_regs);
+}
+
+static void cdns_dsi_j721e_enable(struct cdns_dsi *dsi)
+{
+ /*
+ * Enable DPI0 as its input. DSS0 DPI2 is connected
+ * to DSI DPI0. This is the only supported configuration on
+ * J721E.
+ */
+ writel(DSI_WRAP_DPI_0_EN, dsi->j721e_regs + DSI_WRAP_DPI_CONTROL);
+}
+
+static void cdns_dsi_j721e_disable(struct cdns_dsi *dsi)
+{
+ /* Put everything to defaults */
+ writel(0, dsi->j721e_regs + DSI_WRAP_DPI_CONTROL);
+}
+
+const struct dsi_platform_ops dsi_ti_j721e_ops = {
+ .init = cdns_dsi_j721e_init,
+ .enable = cdns_dsi_j721e_enable,
+ .disable = cdns_dsi_j721e_disable,
+};
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.h
new file mode 100644
index 000000000000..01f3dbd92db2
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-j721e.h
@@ -0,0 +1,18 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * TI j721e Cadence DSI wrapper
+ *
+ * Copyright (C) 2022 Texas Instruments Incorporated - http://www.ti.com/
+ * Author: Rahul T R <r-ravikumar@ti.com>
+ */
+
+#ifndef CDNS_DSI_J721E_H
+#define CDNS_DSI_J721E_H
+
+#include "cdns-dsi-core.h"
+
+struct dsi_platform_ops;
+
+extern const struct dsi_platform_ops dsi_ti_j721e_ops;
+
+#endif /* !CDNS_DSI_J721E_H */
--
2.36.1