openwrt/target/linux/layerscape/patches-5.4/805-display-0014-drm-ls1028a-Add-DP-driver-support-for-LS1028A.patch

From 06e912bd821b21d9360a75cde2d78b03f17a5872 Mon Sep 17 00:00:00 2001
From: Wen He <wen.he_1@nxp.com>
Date: Tue, 17 Sep 2019 15:35:52 +0800
Subject: [PATCH] drm: ls1028a: Add DP driver support for LS1028A

Add Display Port driver support for NXP Layerscape LS1028A platform.

Signed-off-by: Wen He <wen.he_1@nxp.com>
---
 drivers/gpu/drm/bridge/cadence/cdns-dp-core.c |   1 +
 drivers/gpu/drm/imx/Makefile                  |   2 +-
 drivers/gpu/drm/imx/cdn-mhdp-imxdrv.c         |  13 +++
 drivers/gpu/drm/imx/cdn-mhdp-ls1028a.c        | 110 ++++++++++++++++++++++++++
 drivers/gpu/drm/imx/cdns-mhdp-imx.h           |   2 +
 5 files changed, 127 insertions(+), 1 deletion(-)
 create mode 100644 drivers/gpu/drm/imx/cdn-mhdp-ls1028a.c

--- a/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
@@ -275,6 +275,7 @@ static int cdns_dp_bridge_attach(struct
 	struct drm_connector *connector = &mhdp->connector.base;
 
 	connector->interlace_allowed = 1;
+
 	connector->polled = DRM_CONNECTOR_POLL_HPD;
 
 	drm_connector_helper_add(connector, &cdns_dp_connector_helper_funcs);
--- a/drivers/gpu/drm/imx/Makefile
+++ b/drivers/gpu/drm/imx/Makefile
@@ -9,4 +9,4 @@ obj-$(CONFIG_DRM_IMX_TVE) += imx-tve.o
 obj-$(CONFIG_DRM_IMX_LDB) += imx-ldb.o
 
 obj-$(CONFIG_DRM_IMX_HDMI) += dw_hdmi-imx.o
-obj-$(CONFIG_DRM_IMX_CDNS_MHDP) += cdn-mhdp-imxdrv.o cdn-mhdp-dp-phy.o cdn-mhdp-hdmi-phy.o cdn-mhdp-imx8qm.o
+obj-$(CONFIG_DRM_IMX_CDNS_MHDP) += cdn-mhdp-imxdrv.o cdn-mhdp-dp-phy.o cdn-mhdp-hdmi-phy.o cdn-mhdp-imx8qm.o cdn-mhdp-ls1028a.o
--- a/drivers/gpu/drm/imx/cdn-mhdp-imxdrv.c
+++ b/drivers/gpu/drm/imx/cdn-mhdp-imxdrv.c
@@ -94,6 +94,16 @@ static struct cdns_plat_data imx8qm_dp_d
 	.is_dp = true,
 };
 
+static struct cdns_plat_data ls1028a_dp_drv_data = {
+	.bind = cdns_dp_bind,
+	.unbind = cdns_dp_unbind,
+	.phy_set = cdns_dp_phy_set_imx8mq,
+	.power_on = cdns_mhdp_power_on_ls1028a,
+	.firmware_init = cdns_mhdp_firmware_init_imx8qm,
+	.pclk_rate = cdns_mhdp_pclk_rate_ls1028a,
+	.bus_type = BUS_TYPE_NORMAL_APB,
+};
+
 static const struct of_device_id cdns_mhdp_imx_dt_ids[] = {
 	{ .compatible = "cdn,imx8mq-hdmi",
 	  .data = &imx8mq_hdmi_drv_data
@@ -107,6 +117,9 @@ static const struct of_device_id cdns_mh
 	{ .compatible = "cdn,imx8qm-dp",
 	  .data = &imx8qm_dp_drv_data
 	},
+	{ .compatible = "cdn,ls1028a-dp",
+	  .data = &ls1028a_dp_drv_data
+	},
 	{},
 };
 MODULE_DEVICE_TABLE(of, cdns_mhdp_imx_dt_ids);
--- /dev/null
+++ b/drivers/gpu/drm/imx/cdn-mhdp-ls1028a.c
@@ -0,0 +1,110 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright 2019 NXP
+ *
+ */
+#include <linux/clk.h>
+#include <drm/drmP.h>
+#include <linux/of.h>
+#include <linux/of_address.h>
+#include <linux/of_device.h>
+
+#include "cdns-mhdp-imx.h"
+
+static const struct of_device_id scfg_device_ids[] = {
+	{ .compatible = "fsl,ls1028a-scfg", },
+	{}
+};
+
+static void ls1028a_phy_reset(u8 reset)
+{
+	struct device_node *scfg_node;
+	void __iomem *scfg_base = NULL;
+
+	scfg_node = of_find_matching_node(NULL, scfg_device_ids);
+	if (scfg_node)
+		scfg_base = of_iomap(scfg_node, 0);
+
+	iowrite32(reset, scfg_base + 0x230);
+}
+
+int ls1028a_clocks_init(struct imx_mhdp_device *imx_mhdp)
+{
+	struct device *dev = imx_mhdp->mhdp.dev;
+	struct imx_hdp_clks *clks = &imx_mhdp->clks;
+
+	clks->clk_core = devm_clk_get(dev, "clk_core");
+	if (IS_ERR(clks->clk_core)) {
+		dev_warn(dev, "failed to get hdp core clk\n");
+		return PTR_ERR(clks->clk_core);
+	}
+
+	clks->clk_pxl = devm_clk_get(dev, "clk_pxl");
+	if (IS_ERR(clks->clk_pxl)) {
+		dev_warn(dev, "failed to get pxl clk\n");
+		return PTR_ERR(clks->clk_pxl);
+	}
+
+	return true;
+}
+
+static int ls1028a_pixel_clk_enable(struct imx_mhdp_device *imx_mhdp)
+{
+	struct imx_hdp_clks *clks = &imx_mhdp->clks;
+	struct device *dev = imx_mhdp->mhdp.dev;
+	int ret;
+
+	ret = clk_prepare_enable(clks->clk_pxl);
+	if (ret < 0) {
+		dev_err(dev, "%s, pre clk pxl error\n", __func__);
+		return ret;
+	}
+
+	return ret;
+}
+
+static void ls1028a_pixel_clk_disable(struct imx_mhdp_device *imx_mhdp)
+{
+	struct imx_hdp_clks *clks = &imx_mhdp->clks;
+
+	clk_disable_unprepare(clks->clk_pxl);
+}
+
+static void ls1028a_pixel_clk_set_rate(struct imx_mhdp_device *imx_mhdp,
+				       u32 pclock)
+{
+	struct imx_hdp_clks *clks = &imx_mhdp->clks;
+
+	clk_set_rate(clks->clk_pxl, pclock);
+}
+
+int cdns_mhdp_power_on_ls1028a(struct cdns_mhdp_device *mhdp)
+{
+	struct imx_mhdp_device *imx_mhdp = container_of
+				(mhdp, struct imx_mhdp_device, mhdp);
+
+	/* clock init and  rate set */
+	ls1028a_clocks_init(imx_mhdp);
+
+	ls1028a_pixel_clk_enable(imx_mhdp);
+
+	/* Init pixel clock with 148.5MHz before FW init */
+	ls1028a_pixel_clk_set_rate(imx_mhdp, 148500000);
+
+	ls1028a_phy_reset(1);
+
+	return 0;
+}
+
+void cdns_mhdp_pclk_rate_ls1028a(struct cdns_mhdp_device *mhdp)
+{
+	struct imx_mhdp_device *imx_mhdp = container_of
+				(mhdp, struct imx_mhdp_device, mhdp);
+
+	/* set pixel clock before video mode setup */
+	ls1028a_pixel_clk_disable(imx_mhdp);
+
+	ls1028a_pixel_clk_set_rate(imx_mhdp, imx_mhdp->mhdp.mode.clock * 1000);
+
+	ls1028a_pixel_clk_enable(imx_mhdp);
+}
--- a/drivers/gpu/drm/imx/cdns-mhdp-imx.h
+++ b/drivers/gpu/drm/imx/cdns-mhdp-imx.h
@@ -78,4 +78,6 @@ void cdns_mhdp_plat_deinit_imx8qm(struct
 void cdns_mhdp_pclk_rate_imx8qm(struct cdns_mhdp_device *mhdp);
 int cdns_mhdp_firmware_init_imx8qm(struct cdns_mhdp_device *mhdp);
 int cdns_mhdp_power_on_imx8qm(struct cdns_mhdp_device *mhdp);
+int cdns_mhdp_power_on_ls1028a(struct cdns_mhdp_device *mhdp);
+void cdns_mhdp_pclk_rate_ls1028a(struct cdns_mhdp_device *mhdp);
 #endif /* CDNS_MHDP_IMX_H_ */