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Message-Id: <20220106061630.1752762-2-xji@analogixsemi.com>
Date: Thu, 6 Jan 2022 14:16:29 +0800
From: Xin Ji <xji@...logixsemi.com>
To: Andrzej Hajda <a.hajda@...sung.com>,
Neil Armstrong <narmstrong@...libre.com>,
Robert Foss <robert.foss@...aro.org>,
Laurent Pinchart <Laurent.pinchart@...asonboard.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
David Airlie <airlied@...ux.ie>,
Daniel Vetter <daniel@...ll.ch>
Cc: bliang@...logixsemi.com, qwen@...logixsemi.com,
Xin Ji <xji@...logixsemi.com>, dri-devel@...ts.freedesktop.org,
linux-kernel@...r.kernel.org
Subject: [PATCH v2 2/3] drm/bridge: anx7625: add HDCP support
This patch provides HDCP setting interface for userspace to dynamic
enable/disable HDCP function.
Reviewed-by: Robert Foss <robert.foss@...aro.org>
Signed-off-by: Xin Ji <xji@...logixsemi.com>
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 335 +++++++++++++++++++++-
drivers/gpu/drm/bridge/analogix/anx7625.h | 79 ++++-
2 files changed, 404 insertions(+), 10 deletions(-)
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 6d5ae52f4142..a225dd1abf41 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -26,6 +26,7 @@
#include <drm/drm_crtc_helper.h>
#include <drm/drm_dp_helper.h>
#include <drm/drm_edid.h>
+#include <drm/drm_hdcp.h>
#include <drm/drm_mipi_dsi.h>
#include <drm/drm_of.h>
#include <drm/drm_panel.h>
@@ -213,6 +214,65 @@ static int wait_aux_op_finish(struct anx7625_data *ctx)
return 0;
}
+static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
+ u32 address, u8 len, u8 *buf)
+{
+ struct device *dev = &ctx->client->dev;
+ int ret;
+ u8 addrh, addrm, addrl;
+ u8 cmd;
+
+ if (len > MAX_DPCD_BUFFER_SIZE) {
+ dev_err(dev, "exceed aux buffer len.\n");
+ return -EINVAL;
+ }
+
+ addrl = address & 0xFF;
+ addrm = (address >> 8) & 0xFF;
+ addrh = (address >> 16) & 0xFF;
+
+ cmd = DPCD_CMD(len, DPCD_READ);
+ cmd = ((len - 1) << 4) | 0x09;
+
+ /* Set command and length */
+ ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_COMMAND, cmd);
+
+ /* Set aux access address */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_ADDR_7_0, addrl);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_ADDR_15_8, addrm);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_ADDR_19_16, addrh);
+
+ /* Enable aux access */
+ ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
+
+ if (ret < 0) {
+ dev_err(dev, "cannot access aux related register.\n");
+ return -EIO;
+ }
+
+ usleep_range(2000, 2100);
+
+ ret = wait_aux_op_finish(ctx);
+ if (ret) {
+ dev_err(dev, "aux IO error: wait aux op finish.\n");
+ return ret;
+ }
+
+ ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_BUFF_START, len, buf);
+ if (ret < 0) {
+ dev_err(dev, "read dpcd register failed\n");
+ return -EIO;
+ }
+
+ return 0;
+}
+
static int anx7625_video_mute_control(struct anx7625_data *ctx,
u8 status)
{
@@ -669,6 +729,165 @@ static int anx7625_dpi_config(struct anx7625_data *ctx)
return ret;
}
+static int anx7625_read_flash_status(struct anx7625_data *ctx)
+{
+ return anx7625_reg_read(ctx, ctx->i2c.rx_p0_client, R_RAM_CTRL);
+}
+
+static int anx7625_hdcp_key_probe(struct anx7625_data *ctx)
+{
+ int ret, val;
+ struct device *dev = &ctx->client->dev;
+ u8 ident[FLASH_BUF_LEN];
+
+ ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ FLASH_ADDR_HIGH, 0x91);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ FLASH_ADDR_LOW, 0xA0);
+ if (ret < 0) {
+ dev_err(dev, "IO error : set key flash address.\n");
+ return ret;
+ }
+
+ ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ FLASH_LEN_HIGH, (FLASH_BUF_LEN - 1) >> 8);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ FLASH_LEN_LOW, (FLASH_BUF_LEN - 1) & 0xFF);
+ if (ret < 0) {
+ dev_err(dev, "IO error : set key flash len.\n");
+ return ret;
+ }
+
+ ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_FLASH_RW_CTRL, FLASH_READ);
+ ret |= readx_poll_timeout(anx7625_read_flash_status,
+ ctx, val,
+ ((val & FLASH_DONE) || (val < 0)),
+ 2000,
+ 2000 * 150);
+ if (ret) {
+ dev_err(dev, "flash read access fail!\n");
+ return -EIO;
+ }
+
+ ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
+ FLASH_BUF_BASE_ADDR,
+ FLASH_BUF_LEN, ident);
+ if (ret < 0) {
+ dev_err(dev, "read flash data fail!\n");
+ return -EIO;
+ }
+
+ if (ident[29] == 0xFF && ident[30] == 0xFF && ident[31] == 0xFF)
+ return -EINVAL;
+
+ return 0;
+}
+
+static int anx7625_hdcp_key_load(struct anx7625_data *ctx)
+{
+ int ret;
+ struct device *dev = &ctx->client->dev;
+
+ /* Select HDCP 1.4 KEY */
+ ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_BOOT_RETRY, 0x12);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ FLASH_ADDR_HIGH, HDCP14KEY_START_ADDR >> 8);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ FLASH_ADDR_LOW, HDCP14KEY_START_ADDR & 0xFF);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_RAM_LEN_H, HDCP14KEY_SIZE >> 12);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_RAM_LEN_L, HDCP14KEY_SIZE >> 4);
+
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_RAM_ADDR_H, 0);
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_RAM_ADDR_L, 0);
+ /* Enable HDCP 1.4 KEY load */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
+ R_RAM_CTRL, DECRYPT_EN | LOAD_START);
+ dev_dbg(dev, "load HDCP 1.4 key done\n");
+ return ret;
+}
+
+static int anx7625_hdcp_disable(struct anx7625_data *ctx)
+{
+ int ret;
+ struct device *dev = &ctx->client->dev;
+
+ dev_dbg(dev, "disable HDCP 1.4\n");
+
+ /* Disable HDCP */
+ ret = anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
+ /* Try auth flag */
+ ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
+ /* Interrupt for DRM */
+ ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
+ if (ret < 0)
+ dev_err(dev, "fail to disable HDCP\n");
+
+ return anx7625_write_and(ctx, ctx->i2c.tx_p0_client,
+ TX_HDCP_CTRL0, ~HARD_AUTH_EN & 0xFF);
+}
+
+static int anx7625_hdcp_enable(struct anx7625_data *ctx)
+{
+ u8 bcap;
+ int ret;
+ struct device *dev = &ctx->client->dev;
+
+ ret = anx7625_hdcp_key_probe(ctx);
+ if (ret) {
+ dev_dbg(dev, "no key found, not to do hdcp\n");
+ return ret;
+ }
+
+ /* Read downstream capability */
+ anx7625_aux_dpcd_read(ctx, 0x68028, 1, &bcap);
+ if (!(bcap & 0x01)) {
+ pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
+ return 0;
+ }
+
+ dev_dbg(dev, "enable HDCP 1.4\n");
+
+ /* First clear HDCP state */
+ ret = anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
+ TX_HDCP_CTRL0,
+ KSVLIST_VLD | BKSV_SRM_PASS | RE_AUTHEN);
+ usleep_range(1000, 1100);
+ /* Second clear HDCP state */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
+ TX_HDCP_CTRL0,
+ KSVLIST_VLD | BKSV_SRM_PASS | RE_AUTHEN);
+
+ /* Set time for waiting KSVR */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
+ SP_TX_WAIT_KSVR_TIME, 0xc8);
+ /* Set time for waiting R0 */
+ ret |= anx7625_reg_write(ctx, ctx->i2c.tx_p0_client,
+ SP_TX_WAIT_R0_TIME, 0xb0);
+ ret |= anx7625_hdcp_key_load(ctx);
+ if (ret) {
+ pr_warn("prepare HDCP key failed.\n");
+ return ret;
+ }
+
+ ret = anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xee, 0x20);
+
+ /* Try auth flag */
+ ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xec, 0x10);
+ /* Interrupt for DRM */
+ ret |= anx7625_write_or(ctx, ctx->i2c.rx_p1_client, 0xff, 0x01);
+ if (ret < 0)
+ dev_err(dev, "fail to enable HDCP\n");
+
+ return anx7625_write_or(ctx, ctx->i2c.tx_p0_client,
+ TX_HDCP_CTRL0, HARD_AUTH_EN);
+}
+
static void anx7625_dp_start(struct anx7625_data *ctx)
{
int ret;
@@ -679,6 +898,9 @@ static void anx7625_dp_start(struct anx7625_data *ctx)
return;
}
+ /* Disable HDCP */
+ anx7625_write_and(ctx, ctx->i2c.rx_p1_client, 0xee, 0x9f);
+
if (ctx->pdata.is_dpi)
ret = anx7625_dpi_config(ctx);
else
@@ -686,6 +908,10 @@ static void anx7625_dp_start(struct anx7625_data *ctx)
if (ret < 0)
DRM_DEV_ERROR(dev, "MIPI phy setup error.\n");
+
+ ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
+
+ ctx->dp_en = 1;
}
static void anx7625_dp_stop(struct anx7625_data *ctx)
@@ -705,6 +931,10 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
ret |= anx7625_video_mute_control(ctx, 1);
if (ret < 0)
DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
+
+ ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
+
+ ctx->dp_en = 0;
}
static int sp_tx_rst_aux(struct anx7625_data *ctx)
@@ -1697,6 +1927,83 @@ static int anx7625_attach_dsi(struct anx7625_data *ctx)
return 0;
}
+void hdcp_check_work_func(struct work_struct *work)
+{
+ u8 status;
+ struct delayed_work *dwork;
+ struct anx7625_data *ctx;
+ struct device *dev;
+ struct drm_device *drm_dev;
+
+ dwork = to_delayed_work(work);
+ ctx = container_of(dwork, struct anx7625_data, hdcp_work);
+ dev = &ctx->client->dev;
+
+ if (!ctx->connector) {
+ dev_err(dev, "HDCP connector is null!");
+ return;
+ }
+
+ drm_dev = ctx->connector->dev;
+ drm_modeset_lock(&drm_dev->mode_config.connection_mutex, NULL);
+ mutex_lock(&ctx->hdcp_wq_lock);
+
+ status = anx7625_reg_read(ctx, ctx->i2c.tx_p0_client, 0);
+ dev_dbg(dev, "sink HDCP status check: %.02x\n", status);
+ if (status & BIT(1)) {
+ ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_ENABLED;
+ drm_hdcp_update_content_protection(ctx->connector,
+ ctx->hdcp_cp);
+ dev_dbg(dev, "update CP to ENABLE\n");
+ }
+
+ mutex_unlock(&ctx->hdcp_wq_lock);
+ drm_modeset_unlock(&drm_dev->mode_config.connection_mutex);
+}
+
+static int anx7625_connector_atomic_check(struct anx7625_data *ctx,
+ struct drm_connector_state *state)
+{
+ struct device *dev = &ctx->client->dev;
+ int cp;
+
+ dev_dbg(dev, "hdcp state check\n");
+ cp = state->content_protection;
+
+ if (cp == ctx->hdcp_cp)
+ return 0;
+
+ if (cp == DRM_MODE_CONTENT_PROTECTION_DESIRED) {
+ if (ctx->dp_en) {
+ dev_dbg(dev, "enable HDCP\n");
+ anx7625_hdcp_enable(ctx);
+
+ queue_delayed_work(ctx->hdcp_workqueue,
+ &ctx->hdcp_work,
+ msecs_to_jiffies(2000));
+ }
+ }
+
+ if (cp == DRM_MODE_CONTENT_PROTECTION_UNDESIRED) {
+ if (ctx->hdcp_cp != DRM_MODE_CONTENT_PROTECTION_ENABLED) {
+ dev_err(dev, "current CP is not ENABLED\n");
+ return -EINVAL;
+ }
+ anx7625_hdcp_disable(ctx);
+ ctx->hdcp_cp = DRM_MODE_CONTENT_PROTECTION_UNDESIRED;
+ drm_hdcp_update_content_protection(ctx->connector,
+ ctx->hdcp_cp);
+ dev_dbg(dev, "update CP to UNDESIRE\n");
+ }
+
+ if (cp == DRM_MODE_CONTENT_PROTECTION_ENABLED) {
+ dev_err(dev, "Userspace illegal set to PROTECTION ENABLE\n");
+ return -EINVAL;
+ }
+
+ return 0;
+}
+
static int anx7625_bridge_attach(struct drm_bridge *bridge,
enum drm_bridge_attach_flags flags)
{
@@ -1920,8 +2227,11 @@ static int anx7625_bridge_atomic_check(struct drm_bridge *bridge,
struct device *dev = &ctx->client->dev;
dev_dbg(dev, "drm bridge atomic check\n");
- return anx7625_bridge_mode_fixup(bridge, &crtc_state->mode,
- &crtc_state->adjusted_mode);
+
+ anx7625_bridge_mode_fixup(bridge, &crtc_state->mode,
+ &crtc_state->adjusted_mode);
+
+ return anx7625_connector_atomic_check(ctx, conn_state);
}
static void anx7625_bridge_atomic_enable(struct drm_bridge *bridge,
@@ -2189,6 +2499,15 @@ static int anx7625_i2c_probe(struct i2c_client *client,
anx7625_init_gpio(platform);
mutex_init(&platform->lock);
+ mutex_init(&platform->hdcp_wq_lock);
+
+ INIT_DELAYED_WORK(&platform->hdcp_work, hdcp_check_work_func);
+ platform->hdcp_workqueue = create_workqueue("hdcp workqueue");
+ if (!platform->hdcp_workqueue) {
+ dev_err(dev, "fail to create work queue\n");
+ ret = -ENOMEM;
+ goto free_platform;
+ }
platform->pdata.intp_irq = client->irq;
if (platform->pdata.intp_irq) {
@@ -2198,7 +2517,7 @@ static int anx7625_i2c_probe(struct i2c_client *client,
if (!platform->workqueue) {
DRM_DEV_ERROR(dev, "fail to create work queue\n");
ret = -ENOMEM;
- goto free_platform;
+ goto free_hdcp_wq;
}
ret = devm_request_threaded_irq(dev, platform->pdata.intp_irq,
@@ -2268,6 +2587,10 @@ static int anx7625_i2c_probe(struct i2c_client *client,
if (platform->workqueue)
destroy_workqueue(platform->workqueue);
+free_hdcp_wq:
+ if (platform->hdcp_workqueue)
+ destroy_workqueue(platform->hdcp_workqueue);
+
free_platform:
kfree(platform);
@@ -2283,6 +2606,12 @@ static int anx7625_i2c_remove(struct i2c_client *client)
if (platform->pdata.intp_irq)
destroy_workqueue(platform->workqueue);
+ if (platform->hdcp_workqueue) {
+ cancel_delayed_work(&platform->hdcp_work);
+ flush_workqueue(platform->workqueue);
+ destroy_workqueue(platform->workqueue);
+ }
+
if (!platform->pdata.low_power_mode)
pm_runtime_put_sync_suspend(&client->dev);
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 6f9d5f0e377c..56165f5b254c 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -59,10 +59,23 @@
/***************************************************************/
/* Register definition of device address 0x70 */
-#define I2C_ADDR_70_DPTX 0x70
-
-#define SP_TX_LINK_BW_SET_REG 0xA0
-#define SP_TX_LANE_COUNT_SET_REG 0xA1
+#define TX_HDCP_CTRL0 0x01
+#define STORE_AN BIT(7)
+#define RX_REPEATER BIT(6)
+#define RE_AUTHEN BIT(5)
+#define SW_AUTH_OK BIT(4)
+#define HARD_AUTH_EN BIT(3)
+#define ENC_EN BIT(2)
+#define BKSV_SRM_PASS BIT(1)
+#define KSVLIST_VLD BIT(0)
+
+#define SP_TX_WAIT_R0_TIME 0x40
+#define SP_TX_WAIT_KSVR_TIME 0x42
+#define SP_TX_SYS_CTRL1_REG 0x80
+#define HDCP2TX_FW_EN BIT(4)
+
+#define SP_TX_LINK_BW_SET_REG 0xA0
+#define SP_TX_LANE_COUNT_SET_REG 0xA1
#define M_VID_0 0xC0
#define M_VID_1 0xC1
@@ -71,6 +84,12 @@
#define N_VID_1 0xC4
#define N_VID_2 0xC5
+#define KEY_START_ADDR 0x9000
+#define KEY_RESERVED 416
+
+#define HDCP14KEY_START_ADDR (KEY_START_ADDR + KEY_RESERVED)
+#define HDCP14KEY_SIZE 624
+
/***************************************************************/
/* Register definition of device address 0x72 */
#define AUX_RST 0x04
@@ -155,9 +174,43 @@
#define I2C_ADDR_7E_FLASH_CONTROLLER 0x7E
+#define R_BOOT_RETRY 0x00
+#define R_RAM_ADDR_H 0x01
+#define R_RAM_ADDR_L 0x02
+#define R_RAM_LEN_H 0x03
+#define R_RAM_LEN_L 0x04
#define FLASH_LOAD_STA 0x05
#define FLASH_LOAD_STA_CHK BIT(7)
+#define R_RAM_CTRL 0x05
+/* bit positions */
+#define FLASH_DONE BIT(7)
+#define BOOT_LOAD_DONE BIT(6)
+#define CRC_OK BIT(5)
+#define LOAD_DONE BIT(4)
+#define O_RW_DONE BIT(3)
+#define FUSE_BUSY BIT(2)
+#define DECRYPT_EN BIT(1)
+#define LOAD_START BIT(0)
+
+#define FLASH_ADDR_HIGH 0x0F
+#define FLASH_ADDR_LOW 0x10
+#define FLASH_LEN_HIGH 0x31
+#define FLASH_LEN_LOW 0x32
+#define R_FLASH_RW_CTRL 0x33
+/* bit positions */
+#define READ_DELAY_SELECT BIT(7)
+#define GENERAL_INSTRUCTION_EN BIT(6)
+#define FLASH_ERASE_EN BIT(5)
+#define RDID_READ_EN BIT(4)
+#define REMS_READ_EN BIT(3)
+#define WRITE_STATUS_EN BIT(2)
+#define FLASH_READ BIT(1)
+#define FLASH_WRITE BIT(0)
+
+#define FLASH_BUF_BASE_ADDR 0x60
+#define FLASH_BUF_LEN 0x20
+
#define XTAL_FRQ_SEL 0x3F
/* bit field positions */
#define XTAL_FRQ_SEL_POS 5
@@ -184,10 +237,15 @@
#define AP_AUX_CTRL_ADDRONLY 0x20
#define AP_AUX_BUFF_START 0x15
-#define PIXEL_CLOCK_L 0x25
-#define PIXEL_CLOCK_H 0x26
+#define PIXEL_CLOCK_L 0x25
+#define PIXEL_CLOCK_H 0x26
+
+#define AP_AUX_COMMAND 0x27 /* com+len */
+#define LENGTH_SHIFT 4
+#define DPCD_READ 0x09
+#define DPCD_WRITE 0x08
+#define DPCD_CMD(len, cmd) ((((len) - 1) << LENGTH_SHIFT) | (cmd))
-#define AP_AUX_COMMAND 0x27 /* com+len */
/* Bit 0&1: 3D video structure */
/* 0x01: frame packing, 0x02:Line alternative, 0x03:Side-by-side(full) */
#define AP_AV_STATUS 0x28
@@ -392,16 +450,23 @@ struct anx7625_data {
struct platform_device *audio_pdev;
int hpd_status;
int hpd_high_cnt;
+ int dp_en;
+ int hdcp_cp;
/* Lock for work queue */
struct mutex lock;
struct i2c_client *client;
struct anx7625_i2c_client i2c;
struct i2c_client *last_client;
+ struct timer_list hdcp_timer;
struct s_edid_data slimport_edid_p;
struct device *codec_dev;
hdmi_codec_plugged_cb plugged_cb;
struct work_struct work;
struct workqueue_struct *workqueue;
+ struct delayed_work hdcp_work;
+ struct workqueue_struct *hdcp_workqueue;
+ /* Lock for hdcp work queue */
+ struct mutex hdcp_wq_lock;
char edid_block;
struct display_timing dt;
u8 display_timing_valid;
--
2.25.1
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