[Intel-gfx] [PATCH v3 04/17] drm/i915/dp: Add writing of DP SDPs (Secondary Data Packet)
Shankar, Uma
uma.shankar at intel.com
Mon Feb 10 08:16:15 UTC 2020
> -----Original Message-----
> From: Mun, Gwan-gyeong <gwan-gyeong.mun at intel.com>
> Sent: Sunday, February 9, 2020 9:05 AM
> To: Shankar, Uma <uma.shankar at intel.com>; intel-gfx at lists.freedesktop.org
> Cc: dri-devel at lists.freedesktop.org; linux-fbdev at vger.kernel.org
> Subject: Re: [PATCH v3 04/17] drm/i915/dp: Add writing of DP SDPs (Secondary Data
> Packet)
>
> On Wed, 2020-02-05 at 21:39 +0530, Shankar, Uma wrote:
> > > -----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 04/17] drm/i915/dp: Add writing of DP SDPs
> > > (Secondary Data
> > > Packet)
> >
> > Drop things in (), not needed.
> >
> > > 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
> >
> > Typo in mechanism.
> >
> > > 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);
> >
> > 6bpc is not handled here, add that as well.
> >
> Yes, I missed 6bpc case, I'll update it.
> > > + 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
> >
> > Comment Looks incomplete.
> >
> I missed some comments, I'll update it.
> > > + */
> > > + 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
> >
> > Drop "is"
> >
> Includes this, I'll polish polish commit message and comments.
>
> > > + * - 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);
> >
> > dip_enable has VIDEO_DIP_ENABLE_VSC_HSW already in it. Please fix
> > this.
> >
> Declaring of dip_enable does not include VIDEO_DIP_ENABLE_VSC_HSW.
> therefore we need it here to disable VSC SDP DIP.
Oh ok, Took VS for VSC. Scratch my earlier comment, change is correct.
> > > +
> > > + 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
> > >
> > > _______________________________________________
> > > dri-devel mailing list
> > > dri-devel at lists.freedesktop.org
> > > https://lists.freedesktop.org/mailman/listinfo/dri-devel
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