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Date: Wed, 19 Jan 2022 23:17:48 +0800
From: Hsin-Yi Wang <hsinyi@...omium.org>
To: Robert Foss <robert.foss@...aro.org>,
Rob Herring <robh+dt@...nel.org>, Xin Ji <xji@...logixsemi.com>
Cc: David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>,
Laurent Pinchart <laurent.pinchart@...asonboard.com>,
dri-devel@...ts.freedesktop.org, devicetree@...r.kernel.org,
linux-kernel@...r.kernel.org, Andrzej Hajda <a.hajda@...sung.com>,
Neil Armstrong <narmstrong@...libre.com>,
Jonas Karlman <jonas@...boo.se>,
Jernej Skrabec <jernej.skrabec@...il.com>,
Sam Ravnborg <sam@...nborg.org>,
Maxime Ripard <maxime@...no.tech>
Subject: [PATCH v5 1/4] drm/bridge: anx7625: send DPCD command to downstream
From: Xin Ji <xji@...logixsemi.com>
Send DPCD command to downstream before anx7625 power down,
let downstream monitor enter into standby mode.
Signed-off-by: Xin Ji <xji@...logixsemi.com>
Signed-off-by: Hsin-Yi Wang <hsinyi@...omium.org>
---
v3->v4:
Use common DP_AUX_NATIVE_READ/WRITE
Previously in:
https://patchwork.kernel.org/project/dri-devel/patch/1f36f8bf0a48fb2bba17bacec23700e58c1d407d.1641891874.git.xji@analogixsemi.com/
---
drivers/gpu/drm/bridge/analogix/anx7625.c | 42 +++++++++++++++++++----
drivers/gpu/drm/bridge/analogix/anx7625.h | 2 --
2 files changed, 35 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.c b/drivers/gpu/drm/bridge/analogix/anx7625.c
index 76662fce4ce61d..17b23940549a42 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.c
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.c
@@ -129,6 +129,23 @@ static int anx7625_reg_write(struct anx7625_data *ctx,
return ret;
}
+static int anx7625_reg_block_write(struct anx7625_data *ctx,
+ struct i2c_client *client,
+ u8 reg_addr, u8 len, u8 *buf)
+{
+ int ret;
+ struct device *dev = &client->dev;
+
+ i2c_access_workaround(ctx, client);
+
+ ret = i2c_smbus_write_i2c_block_data(client, reg_addr, len, buf);
+ if (ret < 0)
+ dev_err(dev, "write i2c block failed id=%x\n:%x",
+ client->addr, reg_addr);
+
+ return ret;
+}
+
static int anx7625_write_or(struct anx7625_data *ctx,
struct i2c_client *client,
u8 offset, u8 mask)
@@ -214,8 +231,8 @@ 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)
+static int anx7625_aux_dpcd_trans(struct anx7625_data *ctx, u8 op,
+ u32 address, u8 len, u8 *buf)
{
struct device *dev = &ctx->client->dev;
int ret;
@@ -231,8 +248,7 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
addrm = (address >> 8) & 0xFF;
addrh = (address >> 16) & 0xFF;
- cmd = DPCD_CMD(len, DPCD_READ);
- cmd = ((len - 1) << 4) | 0x09;
+ cmd = DPCD_CMD(len, op);
/* Set command and length */
ret = anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
@@ -246,6 +262,9 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
ret |= anx7625_reg_write(ctx, ctx->i2c.rx_p0_client,
AP_AUX_ADDR_19_16, addrh);
+ if (op == DP_AUX_NATIVE_WRITE)
+ ret |= anx7625_reg_block_write(ctx, ctx->i2c.rx_p0_client,
+ AP_AUX_BUFF_START, len, buf);
/* Enable aux access */
ret |= anx7625_write_or(ctx, ctx->i2c.rx_p0_client,
AP_AUX_CTRL_STATUS, AP_AUX_CTRL_OP_EN);
@@ -255,14 +274,17 @@ static int anx7625_aux_dpcd_read(struct anx7625_data *ctx,
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;
}
+ /* Write done */
+ if (op == DP_AUX_NATIVE_WRITE)
+ return 0;
+
+ /* Read done, read out dpcd data */
ret = anx7625_reg_block_read(ctx, ctx->i2c.rx_p0_client,
AP_AUX_BUFF_START, len, buf);
if (ret < 0) {
@@ -845,7 +867,7 @@ static int anx7625_hdcp_enable(struct anx7625_data *ctx)
}
/* Read downstream capability */
- anx7625_aux_dpcd_read(ctx, 0x68028, 1, &bcap);
+ anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_READ, 0x68028, 1, &bcap);
if (!(bcap & 0x01)) {
pr_warn("downstream not support HDCP 1.4, cap(%x).\n", bcap);
return 0;
@@ -918,6 +940,7 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
{
struct device *dev = &ctx->client->dev;
int ret;
+ u8 data;
DRM_DEV_DEBUG_DRIVER(dev, "stop dp output\n");
@@ -929,6 +952,11 @@ static void anx7625_dp_stop(struct anx7625_data *ctx)
ret |= anx7625_write_and(ctx, ctx->i2c.tx_p2_client, 0x08, 0x7f);
ret |= anx7625_video_mute_control(ctx, 1);
+
+ dev_dbg(dev, "notify downstream enter into standby\n");
+ /* Downstream monitor enter into standby mode */
+ data = 2;
+ ret |= anx7625_aux_dpcd_trans(ctx, DP_AUX_NATIVE_WRITE, 0x000600, 1, &data);
if (ret < 0)
DRM_DEV_ERROR(dev, "IO error : mute video fail\n");
diff --git a/drivers/gpu/drm/bridge/analogix/anx7625.h b/drivers/gpu/drm/bridge/analogix/anx7625.h
index 56165f5b254c14..64a8ab56529404 100644
--- a/drivers/gpu/drm/bridge/analogix/anx7625.h
+++ b/drivers/gpu/drm/bridge/analogix/anx7625.h
@@ -242,8 +242,6 @@
#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))
/* Bit 0&1: 3D video structure */
--
2.34.1.703.g22d0c6ccf7-goog
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