On Wed, Jan 19, 2022 at 11:38 PM Robert Foss <robert.foss@xxxxxxxxxx> wrote: > > On Wed, 19 Jan 2022 at 16:17, Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> wrote: > > > > From: Xin Ji <xji@xxxxxxxxxxxxxxxx> > > > > Send DPCD command to downstream before anx7625 power down, > > let downstream monitor enter into standby mode. > > > > Signed-off-by: Xin Ji <xji@xxxxxxxxxxxxxxxx> > > Signed-off-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> Reviewed-by: Hsin-Yi Wang <hsinyi@xxxxxxxxxxxx> > > Hsin-Yi: Can you supply a r-b tag to this patch if it looks good to you? > > > --- > > v3->v4: > > Use common DP_AUX_NATIVE_READ/WRITE > > > > Previously in: > > https://patchwork.kernel.org/project/dri-devel/patch/1f36f8bf0a48fb2bba17bacec23700e58c1d407d.1641891874.git.xji@xxxxxxxxxxxxxxxx/ > > --- > > 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 > >
