[PATCH v3 06/17] drm/i915/dp: Read out DP SDPs (Secondary Data Packet)
Shankar, Uma
uma.shankar at intel.com
Wed Feb 5 16:29:10 UTC 2020
> -----Original Message-----
> From: dri-devel <dri-devel-bounces at lists.freedesktop.org> On Behalf Of Gwan-
> gyeong Mun
> Sent: Tuesday, February 4, 2020 4:50 AM
> To: intel-gfx at lists.freedesktop.org
> Cc: linux-fbdev at vger.kernel.org; dri-devel at lists.freedesktop.org
> Subject: [PATCH v3 06/17] drm/i915/dp: Read out DP SDPs (Secondary Data Packet)
Drop the content in bracket.
> It adds code to read the DP SDPs from the video DIP and unpack them into the crtc
> state.
>
> It adds routines that read out DP VSC SDP and DP HDR Metadata Infoframe SDP In
> order to unpack DP VSC SDP, it adds intel_dp_vsc_sdp_unpack() 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 unpack DP HDR Metadata Infoframe SDP, it adds
> intel_dp_hdr_metadata_infoframe_sdp_unpack(). 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 nameing rule and style of intel_read_dp_sdp() function references
Typo in naming.
> intel_read_infoframe() function of intel_hdmi.c
>
> v2: Minor style fix
> v3: 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 | 170 ++++++++++++++++++++++++
> drivers/gpu/drm/i915/display/intel_dp.h | 3 +
> 2 files changed, 173 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index dd7e5588001e..d4ece0a824c0 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -4925,6 +4925,176 @@ void intel_dp_set_infoframes(struct intel_encoder
> *encoder,
> intel_write_dp_sdp(encoder, crtc_state,
> HDMI_PACKET_TYPE_GAMUT_METADATA); }
>
> +static int intel_dp_vsc_sdp_unpack(struct drm_dp_vsc_sdp *vsc,
> + const void *buffer, size_t size) {
> + const struct dp_sdp *sdp = buffer;
> +
> + if (size < sizeof(struct dp_sdp))
> + return -EINVAL;
> +
> + memset(vsc, 0, size);
> +
> + if (sdp->sdp_header.HB0 != 0)
> + return -EINVAL;
> +
> + if (sdp->sdp_header.HB1 != DP_SDP_VSC)
> + return -EINVAL;
> + vsc->sdp_type = sdp->sdp_header.HB1;
> +
> + if (sdp->sdp_header.HB2 == 0x2 && sdp->sdp_header.HB3 == 0x8) {
> + vsc->revision = sdp->sdp_header.HB2;
> + vsc->length = sdp->sdp_header.HB3;
> + } else if (sdp->sdp_header.HB2 == 0x4 && sdp->sdp_header.HB3 == 0xe) {
> + vsc->revision = sdp->sdp_header.HB2;
> + vsc->length = sdp->sdp_header.HB3;
> + } else if (sdp->sdp_header.HB2 == 0x5 && sdp->sdp_header.HB3 == 0x13) {
> + vsc->revision = sdp->sdp_header.HB2;
> + vsc->length = sdp->sdp_header.HB3;
The above 2 lines can be done unconditionally, may be combine the if checks.
> + vsc->colorspace = (sdp->db[16] >> 4) & 0xf;
> + vsc->colorimetry = sdp->db[16] & 0xf;
> + vsc->dynamic_range = (sdp->db[17] >> 7) & 0x1;
> +
> + switch (sdp->db[17] & 0x7) {
> + case 0x1:
> + vsc->bpc = 8;
> + break;
> + case 0x2:
> + vsc->bpc = 10;
> + break;
> + case 0x3:
> + vsc->bpc = 12;
> + break;
> + case 0x4:
> + vsc->bpc = 16;
> + break;
> + default:
> + MISSING_CASE(sdp->db[17] & 0x7);
Handle 6bpc case as well.
> + return -EINVAL;
> + }
> +
> + vsc->content_type = sdp->db[18] & 0x7;
> + } else {
> + return -EINVAL;
> + }
> +
> + return 0;
> +}
> +
> +static int
> +intel_dp_hdr_metadata_infoframe_sdp_unpack(struct hdmi_drm_infoframe
> *drm_infoframe,
> + const void *buffer, size_t size) {
> + int ret;
> +
> + const struct dp_sdp *sdp = buffer;
> +
> + if (size < sizeof(struct dp_sdp))
> + return -EINVAL;
> +
> + if (sdp->sdp_header.HB0 != 0)
> + return -EINVAL;
> +
> + if (sdp->sdp_header.HB1 != HDMI_INFOFRAME_TYPE_DRM)
> + return -EINVAL;
> +
> + /*
> + * Least Significant Eight Bits of (Data Byte Count – 1)
> + * 1Dh (i.e., Data Byte Count = 30 bytes).
> + */
> + if (sdp->sdp_header.HB2 != 0x1D)
> + return -EINVAL;
> +
> + /* Most Significant Two Bits of (Data Byte Count – 1), Clear to 00b. */
> + if ((sdp->sdp_header.HB3 & 0x3) != 0)
> + return -EINVAL;
> +
> + /* INFOFRAME SDP Version Number */
> + if (((sdp->sdp_header.HB3 >> 2) & 0x3f) != 0x13)
> + return -EINVAL;
> +
> + /* CTA Header Byte 2 (INFOFRAME Version Number) */
> + if (sdp->db[0] != 1)
> + return -EINVAL;
> +
> + /* CTA Header Byte 3 (Length of INFOFRAME):
> HDMI_DRM_INFOFRAME_SIZE */
> + if (sdp->db[1] != HDMI_DRM_INFOFRAME_SIZE)
> + return -EINVAL;
> +
> + ret = hdmi_drm_infoframe_unpack_only(drm_infoframe, &sdp->db[2],
> + HDMI_DRM_INFOFRAME_SIZE);
> +
> + return ret;
> +}
> +
> +static void intel_read_dp_vsc_sdp(struct intel_encoder *encoder,
> + struct intel_crtc_state *crtc_state,
> + struct drm_dp_vsc_sdp *vsc)
> +{
> + struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
> + struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> + unsigned int type = DP_SDP_VSC;
> + struct dp_sdp sdp = {};
> + int ret;
> +
> + /* When PSR is enabled, VSC SDP is handled by PSR routine */
> + if (intel_psr_enabled(intel_dp))
> + return;
> +
> + if ((crtc_state->infoframes.enable &
> + intel_hdmi_infoframe_enable(type)) == 0)
> + return;
> +
> + intel_dig_port->read_infoframe(encoder, crtc_state, type, &sdp,
> +sizeof(sdp));
> +
> + ret = intel_dp_vsc_sdp_unpack(vsc, &sdp, sizeof(sdp));
> +
> + if (ret)
> + DRM_DEBUG_KMS("Failed to unpack DP VSC SDP\n"); }
> +
> +static void intel_read_dp_hdr_metadata_infoframe_sdp(struct intel_encoder
> *encoder,
> + struct intel_crtc_state
> *crtc_state,
> + struct hdmi_drm_infoframe
> *drm_infoframe) {
> + struct intel_digital_port *intel_dig_port = enc_to_dig_port(encoder);
> + unsigned int type = HDMI_PACKET_TYPE_GAMUT_METADATA;
> + struct dp_sdp sdp = {};
> + int ret;
> +
> + if ((crtc_state->infoframes.enable &
> + intel_hdmi_infoframe_enable(type)) == 0)
> + return;
> +
> + intel_dig_port->read_infoframe(encoder, crtc_state, type, &sdp,
> + sizeof(sdp));
> +
> + ret = intel_dp_hdr_metadata_infoframe_sdp_unpack(drm_infoframe, &sdp,
> + sizeof(sdp));
> +
> + if (ret)
> + DRM_DEBUG_KMS("Failed to unpack DP HDR Metadata Infoframe
> SDP\n"); }
> +
> +void intel_read_dp_sdp(struct intel_encoder *encoder,
> + struct intel_crtc_state *crtc_state,
> + unsigned int type)
> +{
> + switch (type) {
> + case DP_SDP_VSC:
> + intel_read_dp_vsc_sdp(encoder, crtc_state,
> + &crtc_state->infoframes.vsc);
> + break;
> + case HDMI_PACKET_TYPE_GAMUT_METADATA:
> + intel_read_dp_hdr_metadata_infoframe_sdp(encoder, crtc_state,
> + &crtc_state-
> >infoframes.drm.drm);
> + break;
> + default:
> + MISSING_CASE(type);
> + break;
> + }
> +}
> +
> 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 0dc09a463ee1..e8f9ba962d09 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> @@ -119,6 +119,9 @@ void intel_dp_hdr_metadata_enable(struct intel_dp
> *intel_dp, 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);
> +void intel_read_dp_sdp(struct intel_encoder *encoder,
> + struct intel_crtc_state *crtc_state,
> + unsigned int type);
> 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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