[PATCH v3 04/17] drm/i915/dp: Add writing of DP SDPs (Secondary Data Packet)
Gwan-gyeong Mun
gwan-gyeong.mun at intel.com
Mon Feb 3 23:20:01 UTC 2020
It adds routines that write DP VSC SDP and DP HDR Metadata Infoframe SDP.
In order to pack DP VSC SDP, it adds intel_dp_vsc_sdp_pack() function.
It follows DP 1.4a spec. [Table 2-116: VSC SDP Header Bytes] and
[Table 2-117: VSC SDP Payload for DB16 through DB18]
In order to pack DP HDR Metadata Infoframe SDP, it adds
intel_dp_hdr_metadata_infoframe_sdp_pack() function.
And it follows DP 1.4a spec.
([Table 2-125: INFOFRAME SDP v1.2 Header Bytes] and
[Table 2-126: INFOFRAME SDP v1.2 Payload Data Bytes - DB0 through DB31])
and CTA-861-G spec. [Table-42 Dynamic Range and Mastering InfoFrame].
A machanism and a naming rule of intel_dp_set_infoframes() function
references intel_encoder->set_infoframes() of intel_hdmi.c .
VSC SDP is used for PSR and Pixel Encoding and Colorimetry Formats cases.
Because PSR routine has its own routine of writing a VSC SDP, when the PSR
is enabled, intel_dp_set_infoframes() does not write a VSC SDP.
v3:
- Explicitly disable unused DIPs (AVI, GCP, VS, SPD, DRM. They will be
used for HDMI), when intel_dp_set_infoframes() function will be called.
- Replace a structure name to drm_dp_vsc_sdp from intel_dp_vsc_sdp.
Signed-off-by: Gwan-gyeong Mun <gwan-gyeong.mun at intel.com>
---
drivers/gpu/drm/i915/display/intel_dp.c | 194 ++++++++++++++++++++++++
drivers/gpu/drm/i915/display/intel_dp.h | 3 +
2 files changed, 197 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index b265b5c599f2..dd7e5588001e 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -4731,6 +4731,200 @@ intel_dp_needs_vsc_sdp(const struct intel_crtc_state *crtc_state,
return false;
}
+static ssize_t intel_dp_vsc_sdp_pack(const struct drm_dp_vsc_sdp *vsc,
+ struct dp_sdp *sdp, size_t size)
+{
+ size_t length = sizeof(struct dp_sdp);
+
+ if (size < length)
+ return -ENOSPC;
+
+ memset(sdp, 0, size);
+
+ /*
+ * Prepare VSC Header for SU as per DP 1.4a spec, Table 2-119
+ * VSC SDP Header Bytes
+ */
+ sdp->sdp_header.HB0 = 0; /* Secondary-Data Packet ID = 0 */
+ sdp->sdp_header.HB1 = vsc->sdp_type; /* Secondary-data Packet Type */
+ sdp->sdp_header.HB2 = vsc->revision; /* Revision Number */
+ sdp->sdp_header.HB3 = vsc->length; /* Number of Valid Data Bytes */
+
+ /* VSC SDP Payload for DB16 through DB18 */
+ /* Pixel Encoding and Colorimetry Formats */
+ sdp->db[16] = (vsc->colorspace & 0xf) << 4; /* DB16[7:4] */
+ sdp->db[16] |= vsc->colorimetry & 0xf; /* DB16[3:0] */
+
+ switch (vsc->bpc) {
+ case 8:
+ sdp->db[17] = 0x1; /* DB17[3:0] */
+ break;
+ case 10:
+ sdp->db[17] = 0x2;
+ break;
+ case 12:
+ sdp->db[17] = 0x3;
+ break;
+ case 16:
+ sdp->db[17] = 0x4;
+ break;
+ default:
+ MISSING_CASE(vsc->bpc);
+ break;
+ }
+ /* Dynamic Range and Component Bit Depth */
+ if (vsc->dynamic_range == DP_DYNAMIC_RANGE_CTA)
+ sdp->db[17] |= 0x80; /* DB17[7] */
+
+ /* Content Type */
+ sdp->db[18] = vsc->content_type & 0x7;
+
+ return length;
+}
+
+static ssize_t
+intel_dp_hdr_metadata_infoframe_sdp_pack(const struct hdmi_drm_infoframe *drm_infoframe,
+ struct dp_sdp *sdp,
+ size_t size)
+{
+ size_t length = sizeof(struct dp_sdp);
+ const int infoframe_size = HDMI_INFOFRAME_HEADER_SIZE + HDMI_DRM_INFOFRAME_SIZE;
+ unsigned char buf[HDMI_INFOFRAME_HEADER_SIZE + HDMI_DRM_INFOFRAME_SIZE];
+ ssize_t len;
+
+ if (size < length)
+ return -ENOSPC;
+
+ memset(sdp, 0, size);
+
+ len = hdmi_drm_infoframe_pack_only(drm_infoframe, buf, sizeof(buf));
+ if (len < 0) {
+ DRM_DEBUG_KMS("buffer size is smaller than hdr metadata infoframe\n");
+ return -ENOSPC;
+ }
+
+ if (len != infoframe_size) {
+ DRM_DEBUG_KMS("wrong static hdr metadata size\n");
+ return -ENOSPC;
+ }
+
+ /*
+ * Set up the infoframe sdp packet for HDR static metadata.
+ * Prepare VSC Header for SU as per DP 1.4a spec,
+ * Table 2-100 and Table 2-101
+ */
+
+ /* Secondary-Data Packet ID, 00h for non-Audio INFOFRAME */
+ sdp->sdp_header.HB0 = 0;
+ /*
+ * Packet Type 80h + Non-audio INFOFRAME Type value
+ * HDMI_INFOFRAME_TYPE_DRM: 0x87
+ * - 80h + Non-audio INFOFRAME Type value
+ * - InfoFrame Type: 0x07
+ * [CTA-861-G Table-42 Dynamic Range and Mastering InfoFrame]
+ */
+ sdp->sdp_header.HB1 = drm_infoframe->type;
+ /*
+ * Least Significant Eight Bits of (Data Byte Count – 1)
+ * infoframe_size - 1
+ */
+ sdp->sdp_header.HB2 = 0x1D;
+ /* INFOFRAME SDP Version Number */
+ sdp->sdp_header.HB3 = (0x13 << 2);
+ /* CTA Header Byte 2 (INFOFRAME Version Number) */
+ sdp->db[0] = drm_infoframe->version;
+ /* CTA Header Byte 3 (Length of INFOFRAME): HDMI_DRM_INFOFRAME_SIZE */
+ sdp->db[1] = drm_infoframe->length;
+ /*
+ * Copy HDMI_DRM_INFOFRAME_SIZE size from a buffer after
+ */
+ BUILD_BUG_ON(sizeof(sdp->db) < HDMI_DRM_INFOFRAME_SIZE + 2);
+ memcpy(&sdp->db[2], &buf[HDMI_INFOFRAME_HEADER_SIZE],
+ HDMI_DRM_INFOFRAME_SIZE);
+
+ /*
+ * Size of DP infoframe sdp packet for HDR static metadata is consist of
+ * - DP SDP Header(struct dp_sdp_header): 4 bytes
+ * - Two Data Blocks: 2 bytes
+ * CTA Header Byte2 (INFOFRAME Version Number)
+ * CTA Header Byte3 (Length of INFOFRAME)
+ * - HDMI_DRM_INFOFRAME_SIZE: 26 bytes
+ *
+ * Prior to GEN11's GMP register size is identical to DP HDR static metadata
+ * infoframe size. But GEN11+ has larger than that size, write_infoframe
+ * will pad rest of the size.
+ */
+ return sizeof(struct dp_sdp_header) + 2 + HDMI_DRM_INFOFRAME_SIZE;
+}
+
+static void intel_write_dp_sdp(struct intel_encoder *encoder,
+ const struct intel_crtc_state *crtc_state,
+ unsigned int type)
+{
+ struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
+ struct dp_sdp sdp = {};
+ ssize_t len;
+
+ if ((crtc_state->infoframes.enable &
+ intel_hdmi_infoframe_enable(type)) == 0)
+ return;
+
+ switch (type) {
+ case DP_SDP_VSC:
+ len = intel_dp_vsc_sdp_pack(&crtc_state->infoframes.vsc, &sdp,
+ sizeof(sdp));
+ break;
+ case HDMI_PACKET_TYPE_GAMUT_METADATA:
+ len = intel_dp_hdr_metadata_infoframe_sdp_pack(&crtc_state->infoframes.drm.drm,
+ &sdp, sizeof(sdp));
+ break;
+ default:
+ MISSING_CASE(type);
+ break;
+ }
+
+ if (WARN_ON(len < 0))
+ return;
+
+ intel_dig_port->write_infoframe(encoder, crtc_state, type, &sdp, len);
+}
+
+void intel_dp_set_infoframes(struct intel_encoder *encoder,
+ bool enable,
+ const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
+ i915_reg_t reg = HSW_TVIDEO_DIP_CTL(crtc_state->cpu_transcoder);
+ u32 dip_enable = VIDEO_DIP_ENABLE_AVI_HSW | VIDEO_DIP_ENABLE_GCP_HSW |
+ VIDEO_DIP_ENABLE_VS_HSW | VIDEO_DIP_ENABLE_GMP_HSW |
+ VIDEO_DIP_ENABLE_SPD_HSW | VIDEO_DIP_ENABLE_DRM_GLK;
+ u32 val = I915_READ(reg);
+
+ /* TODO: Add DSC case (DIP_ENABLE_PPS) */
+ /* When PSR is enabled, this routine doesn't disable VSC DIP */
+ if (intel_psr_enabled(intel_dp))
+ val &= ~dip_enable;
+ else
+ val &= ~(dip_enable | VIDEO_DIP_ENABLE_VSC_HSW);
+
+ if (!enable) {
+ I915_WRITE(reg, val);
+ POSTING_READ(reg);
+ return;
+ }
+
+ I915_WRITE(reg, val);
+ POSTING_READ(reg);
+
+ /* When PSR is enabled, VSC SDP is handled by PSR routine */
+ if (!intel_psr_enabled(intel_dp))
+ intel_write_dp_sdp(encoder, crtc_state, DP_SDP_VSC);
+
+ intel_write_dp_sdp(encoder, crtc_state, HDMI_PACKET_TYPE_GAMUT_METADATA);
+}
+
static void
intel_dp_setup_vsc_sdp(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state,
diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
index 3da166054788..0dc09a463ee1 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.h
+++ b/drivers/gpu/drm/i915/display/intel_dp.h
@@ -116,6 +116,9 @@ void intel_dp_vsc_enable(struct intel_dp *intel_dp,
void intel_dp_hdr_metadata_enable(struct intel_dp *intel_dp,
const struct intel_crtc_state *crtc_state,
const struct drm_connector_state *conn_state);
+void intel_dp_set_infoframes(struct intel_encoder *encoder, bool enable,
+ const struct intel_crtc_state *crtc_state,
+ const struct drm_connector_state *conn_state);
bool intel_digital_port_connected(struct intel_encoder *encoder);
static inline unsigned int intel_dp_unused_lane_mask(int lane_count)
--
2.24.1
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