Some DP/HDMI sink need to receive the audio infoframe to play sound, especially some multi-channel AV receiver, they need the channel_allocation from infoframe to config the speakers. Send the audio infoframe via SDP will make them work properly.
Signed-off-by: Chris Zhong zyw@rock-chips.com
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Changes in v3: None Changes in v2: - According to the advice of Sean Paul and Doug use hdmi_audio_infoframe_pack_payload to pack the buffer define a SDP_HEADER_SIZE
drivers/gpu/drm/rockchip/cdn-dp-core.c | 20 ++++++++++++++++++++ drivers/gpu/drm/rockchip/cdn-dp-reg.c | 27 +++++++++++++++++++++++++++ drivers/gpu/drm/rockchip/cdn-dp-reg.h | 6 ++++++ include/drm/drm_dp_helper.h | 1 + 4 files changed, 54 insertions(+)
diff --git a/drivers/gpu/drm/rockchip/cdn-dp-core.c b/drivers/gpu/drm/rockchip/cdn-dp-core.c index 9b0b058..6a4fc66 100644 --- a/drivers/gpu/drm/rockchip/cdn-dp-core.c +++ b/drivers/gpu/drm/rockchip/cdn-dp-core.c @@ -802,6 +802,7 @@ static int cdn_dp_audio_hw_params(struct device *dev, void *data, .sample_rate = params->sample_rate, .channels = params->channels, }; + u8 buffer[HDMI_AUDIO_INFOFRAME_SIZE + EDP_SDP_HEADER_SIZE] = { 0 }; int ret;
mutex_lock(&dp->lock); @@ -823,6 +824,25 @@ static int cdn_dp_audio_hw_params(struct device *dev, void *data, goto out; }
+ /* + * Prepare the infoframe header to SDP header per DP 1.3 spec, Table + * 2-98. + */ + buffer[0] = 0; + buffer[1] = HDMI_INFOFRAME_TYPE_AUDIO; + buffer[2] = 0x1b; + buffer[3] = 0x48; + + ret = hdmi_audio_infoframe_pack_payload(¶ms->cea, + &buffer[EDP_SDP_HEADER_SIZE], + HDMI_AUDIO_INFOFRAME_SIZE); + if (ret < 0) { + DRM_DEV_ERROR(dev, "Failed to pack audio infoframe: %d\n", ret); + goto out; + } + + cdn_dp_sdp_write(dp, 0, buffer, sizeof(buffer)); + ret = cdn_dp_audio_config(dp, &audio); if (!ret) dp->audio_info = audio; diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.c b/drivers/gpu/drm/rockchip/cdn-dp-reg.c index b14d211..4a818e4 100644 --- a/drivers/gpu/drm/rockchip/cdn-dp-reg.c +++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.c @@ -286,6 +286,33 @@ int cdn_dp_dpcd_write(struct cdn_dp_device *dp, u32 addr, u8 value) return ret; }
+void cdn_dp_sdp_write(struct cdn_dp_device *dp, int entry_id, u8 *buf, + u32 buf_len) +{ + int idx; + u32 *packet = (u32 *)buf; + u32 num_packets = buf_len / 4; + u8 type; + + if (buf_len < EDP_SDP_HEADER_SIZE) { + DRM_DEV_ERROR(dp->dev, "sdp buffer length: %d\n", buf_len); + return; + } + + type = buf[1]; + + for (idx = 0; idx < num_packets; idx++) + writel(cpu_to_le32(*packet++), dp->regs + SOURCE_PIF_DATA_WR); + + writel(entry_id, dp->regs + SOURCE_PIF_WR_ADDR); + + writel(F_HOST_WR, dp->regs + SOURCE_PIF_WR_REQ); + + writel(PIF_PKT_TYPE_VALID | F_PACKET_TYPE(type) | entry_id, + dp->regs + SOURCE_PIF_PKT_ALLOC_REG); + writel(PIF_PKT_ALLOC_WR_EN, dp->regs + SOURCE_PIF_PKT_ALLOC_WR_EN); +} + int cdn_dp_load_firmware(struct cdn_dp_device *dp, const u32 *i_mem, u32 i_size, const u32 *d_mem, u32 d_size) { diff --git a/drivers/gpu/drm/rockchip/cdn-dp-reg.h b/drivers/gpu/drm/rockchip/cdn-dp-reg.h index c4bbb4a83..6ec0e81 100644 --- a/drivers/gpu/drm/rockchip/cdn-dp-reg.h +++ b/drivers/gpu/drm/rockchip/cdn-dp-reg.h @@ -424,6 +424,11 @@ /* Reference cycles when using lane clock as reference */ #define LANE_REF_CYC 0x8000
+#define F_HOST_WR BIT(0) +#define PIF_PKT_ALLOC_WR_EN BIT(0) +#define PIF_PKT_TYPE_VALID (3 << 16) +#define F_PACKET_TYPE(x) (((x) & 0xff) << 8) + enum voltage_swing_level { VOLTAGE_LEVEL_0, VOLTAGE_LEVEL_1, @@ -478,5 +483,6 @@ int cdn_dp_set_video_status(struct cdn_dp_device *dp, int active); int cdn_dp_config_video(struct cdn_dp_device *dp); int cdn_dp_audio_stop(struct cdn_dp_device *dp, struct audio_info *audio); int cdn_dp_audio_mute(struct cdn_dp_device *dp, bool enable); +void cdn_dp_sdp_write(struct cdn_dp_device *dp, int entry_id, u8 *buf, u32 len); int cdn_dp_audio_config(struct cdn_dp_device *dp, struct audio_info *audio); #endif /* _CDN_DP_REG_H */ diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index b17476a..5d5dd07 100644 --- a/include/drm/drm_dp_helper.h +++ b/include/drm/drm_dp_helper.h @@ -878,6 +878,7 @@ struct edp_sdp_header { u8 HB3; /* 7:5 reserved, 4:0 number of valid data bytes */ } __packed;
+#define EDP_SDP_HEADER_SIZE 4 #define EDP_SDP_HEADER_REVISION_MASK 0x1F #define EDP_SDP_HEADER_VALID_PAYLOAD_BYTES 0x1F