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Diffstat (limited to 'target/linux/layerscape/patches-5.4/805-display-0008-drm-bridge-cadence-Add-CEC-driver-for-cdns-mhdp-hdmi.patch')
-rw-r--r--target/linux/layerscape/patches-5.4/805-display-0008-drm-bridge-cadence-Add-CEC-driver-for-cdns-mhdp-hdmi.patch474
1 files changed, 474 insertions, 0 deletions
diff --git a/target/linux/layerscape/patches-5.4/805-display-0008-drm-bridge-cadence-Add-CEC-driver-for-cdns-mhdp-hdmi.patch b/target/linux/layerscape/patches-5.4/805-display-0008-drm-bridge-cadence-Add-CEC-driver-for-cdns-mhdp-hdmi.patch
new file mode 100644
index 0000000000..742928e71a
--- /dev/null
+++ b/target/linux/layerscape/patches-5.4/805-display-0008-drm-bridge-cadence-Add-CEC-driver-for-cdns-mhdp-hdmi.patch
@@ -0,0 +1,474 @@
+From ed9e7a6b3346b186a7bd22d9b62072e55ff7b9c5 Mon Sep 17 00:00:00 2001
+From: Sandor Yu <Sandor.yu@nxp.com>
+Date: Mon, 2 Sep 2019 14:57:05 +0800
+Subject: [PATCH] drm: bridge: cadence: Add CEC driver for cdns mhdp hdmi
+
+Add cec driver for cdns mhdp hdmi.
+
+Signed-off-by: Sandor Yu <Sandor.yu@nxp.com>
+---
+ drivers/gpu/drm/bridge/cadence/Kconfig | 3 +
+ drivers/gpu/drm/bridge/cadence/Makefile | 1 +
+ drivers/gpu/drm/bridge/cadence/cdns-dp-core.c | 0
+ drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c | 9 +
+ drivers/gpu/drm/bridge/cadence/cdns-mhdp-cec.c | 347 ++++++++++++++++++++++
+ drivers/gpu/drm/bridge/cadence/cdns-mhdp-common.c | 0
+ drivers/gpu/drm/bridge/cadence/cdns-mhdp-hdmi.c | 0
+ include/drm/bridge/cdns-mhdp-common.h | 24 +-
+ 8 files changed, 382 insertions(+), 2 deletions(-)
+ mode change 100755 => 100644 drivers/gpu/drm/bridge/cadence/cdns-dp-core.c
+ mode change 100755 => 100644 drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
+ create mode 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp-cec.c
+ mode change 100755 => 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp-common.c
+ mode change 100755 => 100644 drivers/gpu/drm/bridge/cadence/cdns-mhdp-hdmi.c
+
+--- a/drivers/gpu/drm/bridge/cadence/Kconfig
++++ b/drivers/gpu/drm/bridge/cadence/Kconfig
+@@ -14,3 +14,6 @@ config DRM_CDNS_DP
+
+ config DRM_CDNS_AUDIO
+ tristate "Cadence MHDP Audio driver"
++
++config DRM_CDNS_HDMI_CEC
++ tristate "Cadence MHDP HDMI CEC driver"
+--- a/drivers/gpu/drm/bridge/cadence/Makefile
++++ b/drivers/gpu/drm/bridge/cadence/Makefile
+@@ -2,3 +2,4 @@ obj-$(CONFIG_DRM_CDNS_MHDP) += cdns-mhdp
+ obj-$(CONFIG_DRM_CDNS_HDMI) += cdns-hdmi-core.o
+ obj-$(CONFIG_DRM_CDNS_DP) += cdns-dp-core.o
+ obj-$(CONFIG_DRM_CDNS_AUDIO) += cdns-mhdp-audio.o
++obj-$(CONFIG_DRM_CDNS_HDMI_CEC) += cdns-mhdp-cec.o
+--- a/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
++++ b/drivers/gpu/drm/bridge/cadence/cdns-hdmi-core.c
+@@ -515,6 +515,11 @@ __cdns_hdmi_probe(struct platform_device
+ /* register audio driver */
+ cdns_mhdp_register_audio_driver(dev);
+
++ /* register cec driver */
++#ifdef CONFIG_DRM_CDNS_HDMI_CEC
++ cdns_mhdp_register_cec_driver(dev);
++#endif
++
+ return hdmi;
+
+ err_out:
+@@ -524,6 +529,10 @@ err_out:
+
+ static void __cdns_hdmi_remove(struct cdns_mhdp_device *mhdp)
+ {
++ /* unregister cec driver */
++#ifdef CONFIG_DRM_CDNS_HDMI_CEC
++ cdns_mhdp_unregister_cec_driver(mhdp->dev);
++#endif
+ cdns_mhdp_unregister_audio_driver(mhdp->dev);
+ }
+
+--- /dev/null
++++ b/drivers/gpu/drm/bridge/cadence/cdns-mhdp-cec.c
+@@ -0,0 +1,347 @@
++/*
++ * Copyright 2019 NXP
++ *
++ * This program is free software; you can redistribute it and/or
++ * modify it under the terms of the GNU General Public License
++ * as published by the Free Software Foundation; either version 2
++ * of the License, or (at your option) any later version.
++ *
++ * This program is distributed in the hope that it will be useful,
++ * but WITHOUT ANY WARRANTY; without even the implied warranty of
++ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
++ * GNU General Public License for more details.
++ */
++#include <linux/module.h>
++#include <linux/workqueue.h>
++#include <linux/kthread.h>
++#include <linux/freezer.h>
++#include <drm/bridge/cdns-mhdp-common.h>
++
++#define CEC_NAME "cdns-mhdp-cec"
++
++#define REG_ADDR_OFF 4
++#define MAX_LA_IDX 4
++#define MAX_LA_VAL 15
++
++/* regsiter define */
++#define TX_MSG_HEADER 0x33800
++#define TX_MSG_LENGTH 0x33840
++#define TX_MSG_CMD 0x33844
++#define RX_MSG_CMD 0x33850
++#define RX_CLEAR_BUF 0x33854
++#define LOGICAL_ADDRESS_LA0 0x33858
++
++#define CLK_DIV_MSB 0x3386c
++#define CLK_DIV_LSB 0x33870
++#define RX_MSG_DATA1 0x33900
++#define RX_MSG_LENGTH 0x33940
++#define RX_MSG_STATUS 0x33944
++#define NUM_OF_MSG_RX_BUF 0x33948
++#define TX_MSG_STATUS 0x3394c
++#define DB_L_TIMER 0x33980
++
++/**
++ * CEC Transceiver operation.
++ */
++enum {
++ CEC_TX_STOP,
++ CEC_TX_TRANSMIT,
++ CEC_TX_ABORT,
++ CEC_TX_ABORT_AND_TRANSMIT
++};
++
++/**
++ * CEC Transceiver status.
++ */
++enum {
++ CEC_STS_IDLE,
++ CEC_STS_BUSY,
++ CEC_STS_SUCCESS,
++ CEC_STS_ERROR
++};
++
++/**
++ * CEC Receiver operation.
++ */
++enum {
++ CEC_RX_STOP,
++ CEC_RX_READ,
++ CEC_RX_DISABLE,
++ CEC_RX_ABORT_AND_CLR_FIFO
++};
++/**
++ * Maximum number of Messages in the RX Buffers.
++ */
++#define CEC_MAX_RX_MSGS 2
++
++static u32 mhdp_cec_read(struct cdns_mhdp_cec *cec, u32 offset)
++{
++ struct cdns_mhdp_device *mhdp =
++ container_of(cec, struct cdns_mhdp_device, hdmi.cec);
++ return cdns_mhdp_bus_read(mhdp, offset);
++}
++
++static void mhdp_cec_write(struct cdns_mhdp_cec *cec, u32 offset, u32 val)
++{
++ struct cdns_mhdp_device *mhdp =
++ container_of(cec, struct cdns_mhdp_device, hdmi.cec);
++ cdns_mhdp_bus_write(val, mhdp, offset);
++}
++
++static void mhdp_cec_clear_rx_buffer(struct cdns_mhdp_cec *cec)
++{
++ mhdp_cec_write(cec, RX_CLEAR_BUF, 1);
++ mhdp_cec_write(cec, RX_CLEAR_BUF, 0);
++}
++
++static void mhdp_cec_set_divider(struct cdns_mhdp_cec *cec)
++{
++ struct cdns_mhdp_device *mhdp =
++ container_of(cec, struct cdns_mhdp_device, hdmi.cec);
++ u32 clk_div;
++
++ /* Set clock divider */
++ clk_div = cdns_mhdp_get_fw_clk(mhdp) * 10;
++
++ mhdp_cec_write(cec, CLK_DIV_MSB,
++ (clk_div >> 8) & 0xFF);
++ mhdp_cec_write(cec, CLK_DIV_LSB, clk_div & 0xFF);
++}
++
++static u32 mhdp_cec_read_message(struct cdns_mhdp_cec *cec)
++{
++ struct cec_msg *msg = &cec->msg;
++ int len;
++ int i;
++
++ mhdp_cec_write(cec, RX_MSG_CMD, CEC_RX_READ);
++
++ len = mhdp_cec_read(cec, RX_MSG_LENGTH);
++ msg->len = len + 1;
++ dev_dbg(cec->dev, "RX MSG len =%d\n", len);
++
++ /* Read RX MSG bytes */
++ for (i = 0; i < msg->len; ++i) {
++ msg->msg[i] = (u8) mhdp_cec_read(cec, RX_MSG_DATA1 + (i * REG_ADDR_OFF));
++ dev_dbg(cec->dev, "RX MSG[%d]=0x%x\n", i, msg->msg[i]);
++ }
++
++ mhdp_cec_write(cec, RX_MSG_CMD, CEC_RX_STOP);
++
++ return true;
++}
++
++static u32 mhdp_cec_write_message(struct cdns_mhdp_cec *cec, struct cec_msg *msg)
++{
++ u8 i;
++
++ mhdp_cec_write(cec, TX_MSG_CMD, CEC_TX_STOP);
++
++ if (msg->len > CEC_MAX_MSG_SIZE) {
++ dev_err(cec->dev, "Invalid MSG size!\n");
++ return -EINVAL;
++ }
++
++ for (i = 0; i < msg->len; ++i)
++ printk("msg[%d]=0x%x\n",i, msg->msg[i]);
++
++ /* Write Message to register */
++ for (i = 0; i < msg->len; ++i) {
++ mhdp_cec_write(cec, TX_MSG_HEADER + (i * REG_ADDR_OFF),
++ msg->msg[i]);
++ }
++ /* Write Message Length (payload + opcode) */
++ mhdp_cec_write(cec, TX_MSG_LENGTH, msg->len - 1);
++
++ mhdp_cec_write(cec, TX_MSG_CMD, CEC_TX_TRANSMIT);
++
++ return true;
++}
++
++//static void cec_abort_tx_transfer(struct cdns_mhdp_cec *cec)
++//{
++// cec_write(cec, TX_MSG_CMD, CEC_TX_ABORT);
++// cec_write(cec, TX_MSG_CMD, CEC_TX_STOP);
++//}
++
++static int mhdp_cec_set_logical_addr(struct cdns_mhdp_cec *cec, u32 la)
++{
++ u8 i;
++ u8 la_reg;
++
++ if (la >= MAX_LA_VAL) {
++ dev_err(cec->dev, "Error logical Addr\n");
++ return -EINVAL;
++ }
++
++ for (i = 0; i < MAX_LA_IDX; ++i) {
++ la_reg =
++ mhdp_cec_read(cec, LOGICAL_ADDRESS_LA0 + (i * REG_ADDR_OFF));
++
++ if (la_reg & 0x10)
++ continue;
++
++ if ((la_reg & 0xF) == la) {
++ dev_warn(cec->dev, "Warning. LA already in use.\n");
++ return true;
++ }
++
++ la = (la & 0xF) | (1 << 4);
++
++ mhdp_cec_write(cec, LOGICAL_ADDRESS_LA0 + (i * REG_ADDR_OFF), la);
++ return true;
++ }
++
++ dev_warn(cec->dev, "All LA in use\n");
++
++ return false;
++}
++
++static int mhdp_cec_poll_worker(void *_cec)
++{
++ struct cdns_mhdp_cec *cec = (struct cdns_mhdp_cec *)_cec;
++ int num_rx_msgs, i;
++ int sts;
++
++ set_freezable();
++
++ for (;;) {
++ if (kthread_freezable_should_stop(NULL))
++ break;
++
++ /* Check TX State */
++ sts = mhdp_cec_read(cec, TX_MSG_STATUS);
++ switch (sts) {
++ case CEC_STS_SUCCESS:
++ cec_transmit_done(cec->adap, CEC_TX_STATUS_OK, 0, 0, 0,
++ 0);
++ mhdp_cec_write(cec, TX_MSG_CMD, CEC_TX_STOP);
++ break;
++ case CEC_STS_ERROR:
++ mhdp_cec_write(cec, TX_MSG_CMD, CEC_TX_STOP);
++ cec_transmit_done(cec->adap,
++ CEC_TX_STATUS_MAX_RETRIES |
++ CEC_TX_STATUS_NACK, 0, 1, 0, 0);
++ break;
++ case CEC_STS_BUSY:
++ default:
++ break;
++ }
++
++ /* Check RX State */
++ sts = mhdp_cec_read(cec, RX_MSG_STATUS);
++ num_rx_msgs = mhdp_cec_read(cec, NUM_OF_MSG_RX_BUF);
++ switch (sts) {
++ case CEC_STS_SUCCESS:
++ if (num_rx_msgs == 0xf)
++ num_rx_msgs = CEC_MAX_RX_MSGS;
++
++ if (num_rx_msgs > CEC_MAX_RX_MSGS) {
++ dev_err(cec->dev, "Error rx msg num %d\n",
++ num_rx_msgs);
++ mhdp_cec_clear_rx_buffer(cec);
++ break;
++ }
++
++ /* Rx FIFO Depth 2 RX MSG */
++ for (i = 0; i < num_rx_msgs; i++) {
++ mhdp_cec_read_message(cec);
++ cec->msg.rx_status = CEC_RX_STATUS_OK;
++ cec_received_msg(cec->adap, &cec->msg);
++ }
++ break;
++ default:
++ break;
++ }
++
++ if (!kthread_should_stop())
++ schedule_timeout_idle(20);
++ }
++
++ return 0;
++}
++
++static int mhdp_cec_adap_enable(struct cec_adapter *adap, bool enable)
++{
++ struct cdns_mhdp_cec *cec = adap->priv;
++
++ if (enable) {
++ mhdp_cec_write(cec, DB_L_TIMER, 0x10);
++ mhdp_cec_set_divider(cec);
++ } else
++ mhdp_cec_set_divider(cec);
++
++ return 0;
++}
++
++static int mhdp_cec_adap_log_addr(struct cec_adapter *adap, u8 addr)
++{
++ struct cdns_mhdp_cec *cec = adap->priv;
++
++ return mhdp_cec_set_logical_addr(cec, addr);
++}
++
++static int mhdp_cec_adap_transmit(struct cec_adapter *adap, u8 attempts,
++ u32 signal_free_time, struct cec_msg *msg)
++{
++ struct cdns_mhdp_cec *cec = adap->priv;
++
++ mhdp_cec_write_message(cec, msg);
++
++ return 0;
++}
++
++static const struct cec_adap_ops cdns_mhdp_cec_adap_ops = {
++ .adap_enable = mhdp_cec_adap_enable,
++ .adap_log_addr = mhdp_cec_adap_log_addr,
++ .adap_transmit = mhdp_cec_adap_transmit,
++};
++
++int cdns_mhdp_register_cec_driver(struct device *dev)
++{
++ struct cdns_mhdp_device *mhdp = dev_get_drvdata(dev);
++ struct cdns_mhdp_cec *cec = &mhdp->hdmi.cec;
++ int ret;
++
++ cec->adap = cec_allocate_adapter(&cdns_mhdp_cec_adap_ops, cec,
++ CEC_NAME,
++ CEC_CAP_PHYS_ADDR | CEC_CAP_LOG_ADDRS |
++ CEC_CAP_TRANSMIT | CEC_CAP_PASSTHROUGH
++ | CEC_CAP_RC, 1);
++ ret = PTR_ERR_OR_ZERO(cec->adap);
++ if (ret)
++ return ret;
++ ret = cec_register_adapter(cec->adap, dev);
++ if (ret) {
++ cec_delete_adapter(cec->adap);
++ return ret;
++ }
++
++ cec->dev = dev;
++
++ cec->cec_worker = kthread_create(mhdp_cec_poll_worker, cec, "cdns-mhdp-cec");
++ if (IS_ERR(cec->cec_worker))
++ dev_err(cec->dev, "failed create hdp cec thread\n");
++
++ wake_up_process(cec->cec_worker);
++
++ dev_dbg(dev, "CEC successfuly probed\n");
++ return 0;
++}
++
++int cdns_mhdp_unregister_cec_driver(struct device *dev)
++{
++ struct cdns_mhdp_device *mhdp = dev_get_drvdata(dev);
++ struct cdns_mhdp_cec *cec = &mhdp->hdmi.cec;
++
++ if (cec->cec_worker) {
++ kthread_stop(cec->cec_worker);
++ cec->cec_worker = NULL;
++ }
++ cec_unregister_adapter(cec->adap);
++ return 0;
++}
++
++MODULE_AUTHOR("Sandor.Yu@NXP.com");
++MODULE_LICENSE("GPL");
++MODULE_DESCRIPTION("NXP CDNS MHDP CEC driver");
+--- a/include/drm/bridge/cdns-mhdp-common.h
++++ b/include/drm/bridge/cdns-mhdp-common.h
+@@ -21,7 +21,7 @@
+ #include <drm/drm_connector.h>
+ #include <drm/drm_dp_helper.h>
+ #include <drm/drm_dp_mst_helper.h>
+-
++#include <media/cec.h>
+ #include <linux/bitops.h>
+
+ #define ADDR_IMEM 0x10000
+@@ -605,6 +605,17 @@ struct cdns_mhdp_connector {
+ struct cdns_mhdp_bridge *bridge;
+ };
+
++#ifdef CONFIG_DRM_CDNS_HDMI_CEC
++struct cdns_mhdp_cec {
++ struct cec_adapter *adap;
++ struct device *dev;
++ struct mutex lock;
++
++ struct cec_msg msg;
++ struct task_struct *cec_worker;
++};
++#endif
++
+ struct cdns_mhdp_device {
+ void __iomem *regs;
+
+@@ -633,7 +644,7 @@ struct cdns_mhdp_device {
+ bool plugged;
+
+ union {
+- struct cdn_dp_data {
++ struct _dp_data {
+ struct drm_dp_link link;
+ struct drm_dp_aux aux;
+ struct cdns_mhdp_host host;
+@@ -645,6 +656,9 @@ struct cdns_mhdp_device {
+ u32 num_lanes;
+ } dp;
+ struct _hdmi_data {
++#ifdef CONFIG_DRM_CDNS_HDMI_CEC
++ struct cdns_mhdp_cec cec;
++#endif
+ u32 char_rate;
+ u32 hdmi_type;
+ } hdmi;
+@@ -713,4 +727,10 @@ int cdns_hdmi_disable_gcp(struct cdns_mh
+ int cdns_hdmi_enable_gcp(struct cdns_mhdp_device *mhdp);
+
+ bool cdns_mhdp_check_alive(struct cdns_mhdp_device *mhdp);
++/* CEC */
++#ifdef CONFIG_DRM_CDNS_HDMI_CEC
++int cdns_mhdp_register_cec_driver(struct device *dev);
++int cdns_mhdp_unregister_cec_driver(struct device *dev);
++#endif
++
+ #endif /* CDNS_MHDP_COMMON_H_ */
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