> -----Original Message----- > From: Nautiyal, Ankit K <ankit.k.nautiyal@xxxxxxxxx> > Sent: Wednesday, December 16, 2020 11:01 AM > To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx > Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx; Shankar, Uma <uma.shankar@xxxxxxxxx>; > airlied@xxxxxxxx; jani.nikula@xxxxxxxxxxxxxxx; ville.syrjala@xxxxxxxxxxxxxxx; > Kulkarni, Vandita <vandita.kulkarni@xxxxxxxxx>; Sharma, Swati2 > <swati2.sharma@xxxxxxxxx> > Subject: [PATCH v5 07/15] drm/dp_helper: Add helpers to configure PCONs RGB- > YCbCr Conversion > > DP Specification for DP2.0 to HDMI2.1 Pcon specifies support for conversion of > colorspace from RGB to YCbCr. > https://groups.vesa.org/wg/DP/document/previewpdf/15651 > > This patch adds the relavant registers and helper functions to get the capability > and set the color conversion bits for rgb->ycbcr conversion through PCON. > > v2: As suggested in review comments: > -Fixed bug in the check condition in a drm_helper as reported by Dan Carpenter > and Kernel test robot. (Dan Carepenter) -Modified the color-conversion cap > helper function, to accomodate > BT709 and BT2020 colorspace. (Uma Shankar) -Added spec details for the new > cap for color conversion. (Uma Shankar) Looks Good to me. Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx> > Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx> > --- > drivers/gpu/drm/drm_dp_helper.c | 61 +++++++++++++++++++++++++++++++++ > include/drm/drm_dp_helper.h | 19 +++++++++- > 2 files changed, 79 insertions(+), 1 deletion(-) > > diff --git a/drivers/gpu/drm/drm_dp_helper.c > b/drivers/gpu/drm/drm_dp_helper.c index 689fd0d5f6c5..9abd65c694ab 100644 > --- a/drivers/gpu/drm/drm_dp_helper.c > +++ b/drivers/gpu/drm/drm_dp_helper.c > @@ -949,6 +949,38 @@ bool > drm_dp_downstream_444_to_420_conversion(const u8 > dpcd[DP_RECEIVER_CAP_SIZE] } > EXPORT_SYMBOL(drm_dp_downstream_444_to_420_conversion); > > +/** > + * drm_dp_downstream_rgb_to_ycbcr_conversion() - determine downstream > facing port > + * RGB->YCbCr conversion capability > + * @dpcd: DisplayPort configuration data > + * @port_cap: downstream facing port capabilities > + * @colorspc: Colorspace for which conversion cap is sought > + * > + * Returns: whether the downstream facing port can convert RGB->YCbCr > +for a given > + * colorspace. > + */ > +bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 > dpcd[DP_RECEIVER_CAP_SIZE], > + const u8 port_cap[4], > + u8 color_spc) > +{ > + if (!drm_dp_is_branch(dpcd)) > + return false; > + > + if (dpcd[DP_DPCD_REV] < 0x13) > + return false; > + > + switch (port_cap[0] & DP_DS_PORT_TYPE_MASK) { > + case DP_DS_PORT_TYPE_HDMI: > + if ((dpcd[DP_DOWNSTREAMPORT_PRESENT] & > DP_DETAILED_CAP_INFO_AVAILABLE) == 0) > + return false; > + > + return port_cap[3] & color_spc; > + default: > + return false; > + } > +} > +EXPORT_SYMBOL(drm_dp_downstream_rgb_to_ycbcr_conversion); > + > /** > * drm_dp_downstream_mode() - return a mode for downstream facing port > * @dev: DRM device > @@ -3101,3 +3133,32 @@ int drm_dp_pcon_pps_override_param(struct > drm_dp_aux *aux, u8 pps_param[6]) > return 0; > } > EXPORT_SYMBOL(drm_dp_pcon_pps_override_param); > + > +/* > + * drm_dp_pcon_convert_rgb_to_ycbcr() - Configure the PCon to convert > +RGB to Ycbcr > + * @aux: displayPort AUX channel > + * @color_spc: Color-space/s for which conversion is to be enabled, 0 for > disable. > + * > + * Returns 0 on success, else returns negative error code. > + */ > +int drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 > +color_spc) { > + int ret; > + u8 buf; > + > + ret = drm_dp_dpcd_readb(aux, DP_PROTOCOL_CONVERTER_CONTROL_2, > &buf); > + if (ret < 0) > + return ret; > + > + if (color_spc & DP_CONVERSION_RGB_YCBCR_MASK) > + buf |= (color_spc & DP_CONVERSION_RGB_YCBCR_MASK); > + else > + buf &= ~DP_CONVERSION_RGB_YCBCR_MASK; > + > + ret = drm_dp_dpcd_writeb(aux, > DP_PROTOCOL_CONVERTER_CONTROL_2, buf); > + if (ret < 0) > + return ret; > + > + return 0; > +} > +EXPORT_SYMBOL(drm_dp_pcon_convert_rgb_to_ycbcr); > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index > baad87fe6b0a..e096ee98842b 100644 > --- a/include/drm/drm_dp_helper.h > +++ b/include/drm/drm_dp_helper.h > @@ -432,6 +432,17 @@ struct drm_device; > # define DP_DS_HDMI_YCBCR444_TO_422_CONV (1 << 3) > # define DP_DS_HDMI_YCBCR444_TO_420_CONV (1 << 4) > > +/* > + * VESA DP-to-HDMI PCON Specification adds caps for colorspace > + * conversion in DFP cap DPCD 83h. Sec6.1 Table-3. > + * Based on the available support the source can enable > + * color conversion by writing into PROTOCOL_COVERTER_CONTROL_2 > + * DPCD 3052h. > + */ > +# define DP_DS_HDMI_BT601_RGB_YCBCR_CONV (1 << 5) > +# define DP_DS_HDMI_BT709_RGB_YCBCR_CONV (1 << 6) > +# define DP_DS_HDMI_BT2020_RGB_YCBCR_CONV (1 << 7) > + > #define DP_MAX_DOWNSTREAM_PORTS 0x10 > > /* DP Forward error Correction Registers */ @@ -1207,7 +1218,10 @@ struct > drm_device; > # define DP_PCON_ENC_PPS_OVERRIDE_DISABLED 0 > # define DP_PCON_ENC_PPS_OVERRIDE_EN_PARAMS 1 > # define DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER 2 > - > +# define DP_CONVERSION_RGB_YCBCR_MASK (7 << 4) > +# define DP_CONVERSION_BT601_RGB_YCBCR_ENABLE (1 << 4) # define > +DP_CONVERSION_BT709_RGB_YCBCR_ENABLE (1 << 5) # define > +DP_CONVERSION_BT2020_RGB_YCBCR_ENABLE (1 << 6) > > /* PCON Downstream HDMI ERROR Status per Lane */ > #define DP_PCON_HDMI_ERROR_STATUS_LN0 0x3037 > @@ -2167,5 +2181,8 @@ int drm_dp_pcon_dsc_bpp_incr(const u8 > pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE > int drm_dp_pcon_pps_default(struct drm_dp_aux *aux); int > drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8 pps_buf[128]); int > drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8 pps_param[6]); > +bool drm_dp_downstream_rgb_to_ycbcr_conversion(const u8 > dpcd[DP_RECEIVER_CAP_SIZE], > + const u8 port_cap[4], u8 color_spc); > int > +drm_dp_pcon_convert_rgb_to_ycbcr(struct drm_dp_aux *aux, u8 color_spc); > > #endif /* _DRM_DP_HELPER_H_ */ > -- > 2.17.1 _______________________________________________ Intel-gfx mailing list Intel-gfx@xxxxxxxxxxxxxxxxxxxxx https://lists.freedesktop.org/mailman/listinfo/intel-gfx
