[PATCH v3 2/2] drm/bridge: cdns-dsi: Add support for StarFive JH7110 SoC
From: Shengyang Chen
Date: Tue Feb 06 2024 - 02:32:01 EST
From: Keith Zhao <keith.zhao@xxxxxxxxxxxxxxxx>
Add display bridge support for dsi on StarFive JH7110 SoC.
The mainly modification is followed:
1.Add extra clock and reset operation for JH7110.
2.Add callback for JH7110.
Signed-off-by: Keith Zhao <keith.zhao@xxxxxxxxxxxxxxxx>
Signed-off-by: Shengyang Chen <shengyang.chen@xxxxxxxxxxxxxxxx>
---
drivers/gpu/drm/bridge/cadence/Kconfig | 7 +
drivers/gpu/drm/bridge/cadence/Makefile | 1 +
.../gpu/drm/bridge/cadence/cdns-dsi-core.c | 29 ++-
.../gpu/drm/bridge/cadence/cdns-dsi-core.h | 21 ++
.../gpu/drm/bridge/cadence/cdns-dsi-jh7110.c | 193 ++++++++++++++++++
.../gpu/drm/bridge/cadence/cdns-dsi-jh7110.h | 16 ++
6 files changed, 266 insertions(+), 1 deletion(-)
create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c
create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h
diff --git a/drivers/gpu/drm/bridge/cadence/Kconfig b/drivers/gpu/drm/bridge/cadence/Kconfig
index cced81633ddc..ad9f572f4720 100644
--- a/drivers/gpu/drm/bridge/cadence/Kconfig
+++ b/drivers/gpu/drm/bridge/cadence/Kconfig
@@ -19,6 +19,13 @@ config DRM_CDNS_DSI_J721E
help
Support J721E Cadence DSI wrapper. The wrapper manages
the routing of the DSS DPI signal to the Cadence DSI.
+
+config DRM_CDNS_DSI_JH7110
+ bool "JH7110 SOC Cadence DSI support"
+ default n
+ help
+ Cadence DPI to DSI bridge which is embedded in the
+ StarFive JH7110 SoC.
endif
config DRM_CDNS_MHDP8546
diff --git a/drivers/gpu/drm/bridge/cadence/Makefile b/drivers/gpu/drm/bridge/cadence/Makefile
index c95fd5b81d13..87f603a9f4ad 100644
--- a/drivers/gpu/drm/bridge/cadence/Makefile
+++ b/drivers/gpu/drm/bridge/cadence/Makefile
@@ -2,6 +2,7 @@
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
+cdns-dsi-$(CONFIG_DRM_CDNS_DSI_JH7110) += cdns-dsi-jh7110.o
obj-$(CONFIG_DRM_CDNS_MHDP8546) += cdns-mhdp8546.o
cdns-mhdp8546-y := cdns-mhdp8546-core.o cdns-mhdp8546-hdcp.o
cdns-mhdp8546-$(CONFIG_DRM_CDNS_MHDP8546_J721E) += cdns-mhdp8546-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 7457d38622b0..c0c81745e765 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.c
@@ -27,6 +27,10 @@
#include "cdns-dsi-j721e.h"
#endif
+#ifdef CONFIG_DRM_CDNS_DSI_JH7110
+#include "cdns-dsi-jh7110.h"
+#endif
+
#define IP_CONF 0x0
#define SP_HS_FIFO_DEPTH(x) (((x) & GENMASK(30, 26)) >> 26)
#define SP_LP_FIFO_DEPTH(x) (((x) & GENMASK(25, 21)) >> 21)
@@ -552,6 +556,10 @@ static int cdns_dsi_adjust_phy_config(struct cdns_dsi *dsi,
/* data rate was in bytes/sec, convert to bits/sec. */
phy_cfg->hs_clk_rate = dlane_bps * 8;
+ if (dsi->platform_ops && dsi->platform_ops->mode_fixup)
+ adj_dsi_htotal = dsi->platform_ops->mode_fixup(dsi, dsi_cfg, phy_cfg,
+ dpi_hz, dpi_htotal, dsi_htotal);
+
dsi_hfp_ext = adj_dsi_htotal - dsi_htotal;
dsi_cfg->hfp += dsi_hfp_ext;
dsi_cfg->htotal = dsi_htotal + dsi_hfp_ext;
@@ -683,7 +691,7 @@ static void cdns_dsi_bridge_post_disable(struct drm_bridge *bridge)
pm_runtime_put(dsi->base.dev);
}
-static void cdns_dsi_hs_init(struct cdns_dsi *dsi)
+void cdns_dsi_hs_init(struct cdns_dsi *dsi)
{
struct cdns_dsi_output *output = &dsi->output;
u32 status;
@@ -1026,6 +1034,14 @@ static ssize_t cdns_dsi_transfer(struct mipi_dsi_host *host,
cdns_dsi_init_link(dsi);
+ /*
+ * on JH7110 SoC , when transfer dsi command ,
+ * cdns_dsi_hs_init is needed.
+ * or the final ret will be error value.
+ */
+ if (dsi->platform_ops && dsi->platform_ops->transfer)
+ dsi->platform_ops->transfer(dsi);
+
ret = mipi_dsi_create_packet(&packet, msg);
if (ret)
goto out;
@@ -1142,6 +1158,9 @@ static int __maybe_unused cdns_dsi_resume(struct device *dev)
clk_prepare_enable(dsi->dsi_p_clk);
clk_prepare_enable(dsi->dsi_sys_clk);
+ if (dsi->platform_ops && dsi->platform_ops->resume)
+ dsi->platform_ops->resume(dsi);
+
return 0;
}
@@ -1152,6 +1171,10 @@ static int __maybe_unused cdns_dsi_suspend(struct device *dev)
clk_disable_unprepare(dsi->dsi_sys_clk);
clk_disable_unprepare(dsi->dsi_p_clk);
reset_control_assert(dsi->dsi_p_rst);
+
+ if (dsi->platform_ops && dsi->platform_ops->suspend)
+ dsi->platform_ops->suspend(dsi);
+
dsi->link_initialized = false;
return 0;
}
@@ -1294,6 +1317,10 @@ static const struct of_device_id cdns_dsi_of_match[] = {
#ifdef CONFIG_DRM_CDNS_DSI_J721E
{ .compatible = "ti,j721e-dsi", .data = &dsi_ti_j721e_ops, },
#endif
+#ifdef CONFIG_DRM_CDNS_DSI_JH7110
+ { .compatible = "starfive,jh7110-dsi", .data = &dsi_ti_jh7110_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 ca7ea2da635c..0a86495ead7b 100644
--- a/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-core.h
@@ -53,12 +53,22 @@ struct cdns_dsi;
* @deinit: Called in the CDNS DSI remove
* @enable: Called at the beginning of CDNS DSI bridge enable
* @disable: Called at the end of CDNS DSI bridge disable
+ * @resume: Called at the resume of CDNS DSI
+ * @suspend: Called at the suspend of CDNS DSI
+ * @update: Called at the middle of CDNS DSI bridge enable
*/
struct cdns_dsi_platform_ops {
int (*init)(struct cdns_dsi *dsi);
void (*deinit)(struct cdns_dsi *dsi);
void (*enable)(struct cdns_dsi *dsi);
void (*disable)(struct cdns_dsi *dsi);
+ void (*resume)(struct cdns_dsi *dsi);
+ void (*suspend)(struct cdns_dsi *dsi);
+ int (*mode_fixup)(struct cdns_dsi *dsi, struct cdns_dsi_cfg *dsi_cfg,
+ struct phy_configure_opts_mipi_dphy *phy_cfg,
+ unsigned long dpi_hz, unsigned long dpi_htotal,
+ unsigned long dsi_htotal);
+ void (*transfer)(struct cdns_dsi *dsi);
};
struct cdns_dsi {
@@ -79,6 +89,17 @@ struct cdns_dsi {
bool link_initialized;
bool phy_initialized;
struct phy *dphy;
+
+#ifdef CONFIG_DRM_CDNS_DSI_JH7110
+ struct clk *dpi_clk;
+ struct clk *txesc_clk;
+ struct reset_control *dpi_rst;
+ struct reset_control *sys_rst;
+ struct reset_control *txesc_rst;
+ struct reset_control *txbytehs_rst;
+#endif
};
+void cdns_dsi_hs_init(struct cdns_dsi *dsi);
+
#endif /* !__CDNS_DSI_H__ */
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c
new file mode 100644
index 000000000000..c6b9296a9275
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.c
@@ -0,0 +1,193 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * JH7110 SoC Cadence DSI wrapper
+ *
+ * Copyright (C) 2023 StarFive Technology Co., Ltd.
+ */
+
+#include <linux/clk.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/reset.h>
+
+#include "cdns-dsi-jh7110.h"
+
+static int cdns_dsi_clock_enable(struct cdns_dsi *dsi, struct device *dev)
+{
+ int ret;
+
+ ret = clk_prepare_enable(dsi->dpi_clk);
+ if (ret) {
+ dev_err(dev, "Failed to prepare/enable dpi_clk\n");
+ return ret;
+ }
+
+ ret = clk_prepare_enable(dsi->txesc_clk);
+ if (ret) {
+ dev_err(dev, "Failed to prepare/enable txesc_clk\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static void cdns_dsi_clock_disable(struct cdns_dsi *dsi)
+{
+ clk_disable_unprepare(dsi->dpi_clk);
+ clk_disable_unprepare(dsi->txesc_clk);
+}
+
+static int cdns_dsi_resets_deassert(struct cdns_dsi *dsi, struct device *dev)
+{
+ int ret;
+
+ ret = reset_control_deassert(dsi->dpi_rst);
+ if (ret < 0) {
+ dev_err(dev, "failed to deassert dpi_rst\n");
+ return ret;
+ }
+
+ ret = reset_control_deassert(dsi->txesc_rst);
+ if (ret < 0) {
+ dev_err(dev, "failed to deassert txesc_rst\n");
+ return ret;
+ }
+
+ ret = reset_control_deassert(dsi->sys_rst);
+ if (ret < 0) {
+ dev_err(dev, "failed to deassert sys_rst\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int cdns_dsi_resets_assert(struct cdns_dsi *dsi, struct device *dev)
+{
+ int ret;
+
+ ret = reset_control_assert(dsi->dpi_rst);
+ if (ret < 0) {
+ dev_err(dev, "failed to assert dpi_rst\n");
+ return ret;
+ }
+
+ ret = reset_control_assert(dsi->txesc_rst);
+ if (ret < 0) {
+ dev_err(dev, "failed to assert txesc_rst\n");
+ return ret;
+ }
+
+ ret = reset_control_assert(dsi->sys_rst);
+ if (ret < 0) {
+ dev_err(dev, "failed to assert sys_rst\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static int cdns_dsi_get_clock(struct device *dev, struct cdns_dsi *dsi)
+{
+ dsi->dpi_clk = devm_clk_get(dev, "dpi");
+ if (IS_ERR(dsi->dpi_clk))
+ return PTR_ERR(dsi->dpi_clk);
+
+ dsi->txesc_clk = devm_clk_get(dev, "txesc");
+ if (IS_ERR(dsi->txesc_clk))
+ return PTR_ERR(dsi->txesc_clk);
+
+ return 0;
+}
+
+static int cdns_dsi_get_reset(struct device *dev, struct cdns_dsi *dsi)
+{
+ dsi->sys_rst = devm_reset_control_get_exclusive(dev, "sys");
+ if (IS_ERR(dsi->sys_rst))
+ return PTR_ERR(dsi->sys_rst);
+
+ dsi->dpi_rst = devm_reset_control_get_exclusive(dev, "dpi");
+ if (IS_ERR(dsi->dpi_rst))
+ return PTR_ERR(dsi->dpi_rst);
+
+ dsi->txesc_rst = devm_reset_control_get_exclusive(dev, "txesc");
+ if (IS_ERR(dsi->txesc_rst))
+ return PTR_ERR(dsi->txesc_rst);
+
+ dsi->txbytehs_rst = devm_reset_control_get_exclusive(dev, "txbytehs");
+ if (IS_ERR(dsi->txbytehs_rst))
+ return PTR_ERR(dsi->txbytehs_rst);
+
+ return 0;
+}
+
+static int cdns_dsi_jh7110_init(struct cdns_dsi *dsi)
+{
+ int ret;
+
+ ret = cdns_dsi_get_clock(dsi->base.dev, dsi);
+ if (ret)
+ return ret;
+
+ return cdns_dsi_get_reset(dsi->base.dev, dsi);
+}
+
+static void cdns_dsi_jh7110_resume(struct cdns_dsi *dsi)
+{
+ int ret;
+
+ ret = cdns_dsi_clock_enable(dsi, dsi->base.dev);
+ if (ret) {
+ dev_err(dsi->base.dev, "failed to enable clock\n");
+ return;
+ }
+ ret = cdns_dsi_resets_deassert(dsi, dsi->base.dev);
+ if (ret < 0) {
+ dev_err(dsi->base.dev, "failed to deassert reset\n");
+ return;
+ }
+}
+
+static void cdns_dsi_jh7110_suspend(struct cdns_dsi *dsi)
+{
+ int ret;
+
+ ret = cdns_dsi_resets_assert(dsi, dsi->base.dev);
+ if (ret < 0) {
+ dev_err(dsi->base.dev, "failed to deassert reset\n");
+ return;
+ }
+
+ cdns_dsi_clock_disable(dsi);
+}
+
+static int cdns_dsi_jh7110_mode_fixup(struct cdns_dsi *dsi, struct cdns_dsi_cfg *dsi_cfg,
+ struct phy_configure_opts_mipi_dphy *phy_cfg,
+ unsigned long dpi_hz, unsigned long dpi_htotal,
+ unsigned long dsi_htotal)
+{
+ unsigned long long dlane_bps;
+ unsigned long adj_dsi_htotal;
+ unsigned int lanes = dsi->output.dev->lanes;
+
+ phy_cfg->hs_clk_rate = phy_cfg->hs_clk_rate - (phy_cfg->hs_clk_rate % 10000000);
+ phy_cfg->hs_clk_rate += 100000000;
+ dlane_bps = phy_cfg->hs_clk_rate * lanes * dpi_htotal / 8;
+ adj_dsi_htotal = dlane_bps / dpi_hz;
+
+ return adj_dsi_htotal;
+}
+
+static void jh7110_cdns_dsi_hs_init(struct cdns_dsi *dsi)
+{
+ cdns_dsi_hs_init(dsi);
+ reset_control_deassert(dsi->txbytehs_rst);
+}
+
+const struct cdns_dsi_platform_ops dsi_ti_jh7110_ops = {
+ .init = cdns_dsi_jh7110_init,
+ .resume = cdns_dsi_jh7110_resume,
+ .suspend = cdns_dsi_jh7110_suspend,
+ .mode_fixup = cdns_dsi_jh7110_mode_fixup,
+ .transfer = jh7110_cdns_dsi_hs_init,
+};
diff --git a/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h
new file mode 100644
index 000000000000..15d6a766b502
--- /dev/null
+++ b/drivers/gpu/drm/bridge/cadence/cdns-dsi-jh7110.h
@@ -0,0 +1,16 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * JH7110 Cadence DSI
+ *
+ * Copyright (C) 2022-2023 StarFive Technology Co., Ltd.
+ * Author: keith.zhao <keith.zhao@xxxxxxxxxxxxxxxx>
+ */
+
+#ifndef __CDNS_DSI_JH7110_H__
+#define __CDNS_DSI_JH7110_H__
+
+#include "cdns-dsi-core.h"
+
+extern const struct cdns_dsi_platform_ops dsi_ti_jh7110_ops;
+
+#endif /* !__CDNS_DSI_JH7110_H__ */
--
2.17.1