On Fri, 27 Mar 2020, Vipin Anand <vipin.anand@xxxxxxxxx> wrote:
> From: Uma Shankar <uma.shankar@xxxxxxxxx>
>
> Gen9 hardware supports HDMI2.0 through LSPCON chips.
> Extending HDR support for MCA LSPCON based GEN9 devices.
>
> SOC will drive LSPCON as DP and send HDR metadata as standard
> DP SDP packets. LSPCON will be set to operate in PCON mode,
> will receive the metadata and create Dynamic Range and
> Mastering Infoframe (DRM packets) and send it to HDR capable
> HDMI sink devices.
>
> v2: Re-used hsw infoframe write implementation for HDR metadata
> for LSPCON as per Ville's suggestion.
>
> Signed-off-by: Uma Shankar <uma.shankar@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_hdmi.c | 10 ++++++
> drivers/gpu/drm/i915/display/intel_lspcon.c | 35 +++++++++++++++------
> drivers/gpu/drm/i915/display/intel_lspcon.h | 5 ++-
> 3 files changed, 39 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index 93ac0f296852..9ae2f88cc925 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -577,6 +577,16 @@ static u32 hsw_infoframes_enabled(struct intel_encoder *encoder,
> return val & mask;
> }
>
> +void lspcon_drm_write_infoframe(struct intel_encoder *encoder,
> + const struct intel_crtc_state *crtc_state,
> + unsigned int type,
> + const void *frame, ssize_t len)
> +{
> + DRM_DEBUG_KMS("Update HDR metadata for lspcon\n");
> + /* It uses the legacy hsw implementation for the same */
> + hsw_write_infoframe(encoder, crtc_state, type, frame, len);
> +}
This seems like an unnecessary wrapper.
> +
> static const u8 infoframe_type_to_idx[] = {
> HDMI_PACKET_TYPE_GENERAL_CONTROL,
> HDMI_PACKET_TYPE_GAMUT_METADATA,
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.c b/drivers/gpu/drm/i915/display/intel_lspcon.c
> index 2e41ae483a23..c5ddabf903d6 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.c
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.c
> @@ -460,27 +460,42 @@ void lspcon_write_infoframe(struct intel_encoder *encoder,
> unsigned int type,
> const void *frame, ssize_t len)
> {
> - bool ret;
> + bool ret = true;
> struct intel_dp *intel_dp = enc_to_intel_dp(encoder);
> struct intel_lspcon *lspcon = enc_to_intel_lspcon(encoder);
>
> /* LSPCON only needs AVI IF */
> - if (type != HDMI_INFOFRAME_TYPE_AVI)
> + if (!(type == HDMI_INFOFRAME_TYPE_AVI ||
> + type == HDMI_PACKET_TYPE_GAMUT_METADATA))
> return;
>
> - if (lspcon->vendor == LSPCON_VENDOR_MCA)
> - ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux,
> - frame, len);
> - else
> - ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux,
> - frame, len);
> + /*
> + * Supporting HDR on MCA LSPCON
> + * Todo: Add support for Parade later
> + */
> + if (type == HDMI_PACKET_TYPE_GAMUT_METADATA &&
> + lspcon->vendor != LSPCON_VENDOR_MCA)
> + return;
> +
> + if (lspcon->vendor == LSPCON_VENDOR_MCA) {
> + if (type == HDMI_INFOFRAME_TYPE_AVI)
> + ret = _lspcon_write_avi_infoframe_mca(&intel_dp->aux,
> + frame, len);
> + else if (type == HDMI_PACKET_TYPE_GAMUT_METADATA)
> + lspcon_drm_write_infoframe(encoder, crtc_state,
> + HDMI_PACKET_TYPE_GAMUT_METADATA,
> + frame, VIDEO_DIP_DATA_SIZE);
> + } else {
> + ret = _lspcon_write_avi_infoframe_parade(&intel_dp->aux, frame,
> + len);
> + }
Seems to me it would be best to replace from the beginning of this
function with something like:
switch (type) {
case HDMI_INFOFRAME_TYPE_AVI:
if (lspcon->vendor == LSPCON_VENDOR_MCA)
...
else
...
break;
case HDMI_PACKET_TYPE_GAMUT_METADATA:
if (lspcon->vendor == LSPCON_VENDOR_MCA)
...
else
break;
break;
default:
return;
}
Then it'll be straightforward to replace the actual vendor specific if
ladders with function pointers in struct intel_lspcon in the future.
>
> if (!ret) {
> - DRM_ERROR("Failed to write AVI infoframes\n");
> + DRM_ERROR("Failed to write infoframes\n");
> return;
> }
>
> - DRM_DEBUG_DRIVER("AVI infoframes updated successfully\n");
> + DRM_DEBUG_DRIVER("Infoframes updated successfully\n");
> }
>
> void lspcon_read_infoframe(struct intel_encoder *encoder,
> diff --git a/drivers/gpu/drm/i915/display/intel_lspcon.h b/drivers/gpu/drm/i915/display/intel_lspcon.h
> index 37cfddf8a9c5..b2051f236223 100644
> --- a/drivers/gpu/drm/i915/display/intel_lspcon.h
> +++ b/drivers/gpu/drm/i915/display/intel_lspcon.h
> @@ -34,5 +34,8 @@ u32 lspcon_infoframes_enabled(struct intel_encoder *encoder,
> const struct intel_crtc_state *pipe_config);
> void lspcon_ycbcr420_config(struct drm_connector *connector,
> struct intel_crtc_state *crtc_state);
> -
> +void lspcon_drm_write_infoframe(struct intel_encoder *encoder,
> + const struct intel_crtc_state *crtc_state,
> + unsigned int type,
> + const void *frame, ssize_t len);
> #endif /* __INTEL_LSPCON_H__ */
--
Jani Nikula, Intel Open Source Graphics Center
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