Re: [PATCH v2 06/13] drm/dp_helper: Add support for Configuring DSC for HDMI2.1 Pcon

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> -----Original Message-----
> From: Nautiyal, Ankit K <ankit.k.nautiyal@xxxxxxxxx>
> Sent: Sunday, November 1, 2020 3:37 PM
> To: intel-gfx@xxxxxxxxxxxxxxxxxxxxx
> Cc: dri-devel@xxxxxxxxxxxxxxxxxxxxx; Shankar, Uma <uma.shankar@xxxxxxxxx>;
> Kulkarni, Vandita <vandita.kulkarni@xxxxxxxxx>; ville.syrjala@xxxxxxxxxxxxxxx;
> Sharma, Swati2 <swati2.sharma@xxxxxxxxx>
> Subject: [PATCH v2 06/13] drm/dp_helper: Add support for Configuring DSC for
> HDMI2.1 Pcon
> 
> This patch adds registers for getting DSC encoder capability for a HDMI2.1 PCon.
> It also addes helper functions to configure DSC between the PCON and HDMI2.1
> sink.
> 
> v2: Corrected offset for DSC encoder bpc and minor changes.
> Also added helper functions for getting pcon dsc encoder capabilities as
> suggested by Uma Shankar.
> 
> Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal@xxxxxxxxx>
> ---
>  drivers/gpu/drm/drm_dp_helper.c | 197 ++++++++++++++++++++++++++++++++
>  include/drm/drm_dp_helper.h     | 114 ++++++++++++++++++
>  2 files changed, 311 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_helper.c
> b/drivers/gpu/drm/drm_dp_helper.c index 05782091e7e1..8162ee856b5d 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -2932,3 +2932,200 @@ void drm_dp_pcon_hdmi_frl_link_error_count(struct
> drm_dp_aux *aux,
>  	}
>  }
>  EXPORT_SYMBOL(drm_dp_pcon_hdmi_frl_link_error_count);
> +
> +/*
> + * drm_dp_pcon_enc_is_dsc_1_2 - Does PCON Encoder supports DSC 1.2
> + * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
> + *
> + * Returns true is PCON encoder is DSC 1.2 else returns false.
> + */
> +bool drm_dp_pcon_enc_is_dsc_1_2(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
> +{
> +	u8 buf;
> +	u8 major_v, minor_v;
> +
> +	buf = pcon_dsc_dpcd[DP_PCON_DSC_VERSION -
> DP_PCON_DSC_ENCODER];
> +	major_v = (buf & DP_PCON_DSC_MAJOR_MASK) >>
> DP_PCON_DSC_MAJOR_SHIFT;
> +	minor_v = (buf & DP_PCON_DSC_MINOR_MASK) >>
> DP_PCON_DSC_MINOR_SHIFT;
> +
> +	if (major_v == 1 && minor_v == 2)
> +		return true;
> +
> +	return false;
> +}
> +EXPORT_SYMBOL(drm_dp_pcon_enc_is_dsc_1_2);
> +
> +/*
> + * drm_dp_pcon_dsc_max_slices - Get max slices supported by PCON DSC
> +Encoder
> + * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
> + *
> + * Returns maximum no. of slices supported by the PCON DSC Encoder.
> + */
> +int drm_dp_pcon_dsc_max_slices(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
> +{
> +	u8 slice_cap1, slice_cap2;
> +
> +	slice_cap1 = pcon_dsc_dpcd[DP_PCON_DSC_SLICE_CAP_1 -
> DP_PCON_DSC_ENCODER];
> +	slice_cap2 = pcon_dsc_dpcd[DP_PCON_DSC_SLICE_CAP_2 -
> +DP_PCON_DSC_ENCODER];
> +
> +	if (slice_cap2 & DP_PCON_DSC_24_PER_DSC_ENC)
> +		return 24;

You can use else if to optimize this up.

> +	if (slice_cap2 & DP_PCON_DSC_20_PER_DSC_ENC)
> +		return 20;
> +	if (slice_cap2 & DP_PCON_DSC_16_PER_DSC_ENC)
> +		return 16;
> +	if (slice_cap1 & DP_PCON_DSC_12_PER_DSC_ENC)
> +		return 12;
> +	if (slice_cap1 & DP_PCON_DSC_10_PER_DSC_ENC)
> +		return 10;
> +	if (slice_cap1 & DP_PCON_DSC_8_PER_DSC_ENC)
> +		return 8;
> +	if (slice_cap1 & DP_PCON_DSC_6_PER_DSC_ENC)
> +		return 6;
> +	if (slice_cap1 & DP_PCON_DSC_4_PER_DSC_ENC)
> +		return 4;
> +	if (slice_cap1 & DP_PCON_DSC_2_PER_DSC_ENC)
> +		return 2;
> +	if (slice_cap1 & DP_PCON_DSC_1_PER_DSC_ENC)
> +		return 1;

Add else return 0.

With this fixed:
Reviewed-by: Uma Shankar <uma.shankar@xxxxxxxxx>

> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_pcon_dsc_max_slices);
> +
> +/*
> + * drm_dp_pcon_dsc_max_slice_width() - Get max slice width for Pcon DSC
> +encoder
> + * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
> + *
> + * Returns maximum width of the slices in pixel width i.e. no. of pixels x 320.
> + */
> +int drm_dp_pcon_dsc_max_slice_width(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
> +{
> +	u8 buf;
> +
> +	buf = pcon_dsc_dpcd[DP_PCON_DSC_MAX_SLICE_WIDTH -
> +DP_PCON_DSC_ENCODER];
> +
> +	return buf * DP_DSC_SLICE_WIDTH_MULTIPLIER; }
> +EXPORT_SYMBOL(drm_dp_pcon_dsc_max_slice_width);
> +
> +/*
> + * drm_dp_pcon_dsc_bpp_incr() - Get bits per pixel increment for PCON
> +DSC encoder
> + * @pcon_dsc_dpcd: DSC capabilities of the PCON DSC Encoder
> + *
> + * Returns the bpp precision supported by the PCON encoder.
> + */
> +int drm_dp_pcon_dsc_bpp_incr(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE])
> +{
> +	u8 buf;
> +
> +	buf = pcon_dsc_dpcd[DP_PCON_DSC_BPP_INCR -
> DP_PCON_DSC_ENCODER];
> +
> +	switch (buf & DP_PCON_DSC_BPP_INCR_MASK) {
> +	case DP_PCON_DSC_ONE_16TH_BPP:
> +		return 16;
> +	case DP_PCON_DSC_ONE_8TH_BPP:
> +		return 8;
> +	case DP_PCON_DSC_ONE_4TH_BPP:
> +		return 4;
> +	case DP_PCON_DSC_ONE_HALF_BPP:
> +		return 2;
> +	case DP_PCON_DSC_ONE_BPP:
> +		return 1;
> +	}
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_pcon_dsc_bpp_incr);
> +
> +static
> +int drm_dp_pcon_configure_dsc_enc(struct drm_dp_aux *aux, u8
> +pps_buf_config) {
> +	u8 buf = DP_PCON_ENABLE_DSC_ENCODER;
> +	int ret;
> +
> +	if (pps_buf_config <= DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER) {
> +		buf &= ~DP_PCON_ENCODER_PPS_OVERRIDE_MASK;
> +		buf |= pps_buf_config << 2;
> +	}
> +
> +	ret = drm_dp_dpcd_writeb(aux,
> DP_PROTOCOL_CONVERTER_CONTROL_2, buf);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +
> +/**
> + * drm_dp_pcon_pps_default() - Let PCON fill the default pps parameters
> + * for DSC1.2 between PCON & HDMI2.1 sink
> + * @aux: DisplayPort AUX channel
> + *
> + * Returns 0 on success, else returns negative error code.
> + * */
> +int drm_dp_pcon_pps_default(struct drm_dp_aux *aux) {
> +	int ret;
> +
> +	ret = drm_dp_pcon_configure_dsc_enc(aux,
> DP_PCON_ENC_PPS_OVERRIDE_DISABLED);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_pcon_pps_default);
> +
> +/**
> + * drm_dp_pcon_pps_override_buf() - Configure PPS encoder override
> +buffer for
> + * HDMI sink
> + * @aux: DisplayPort AUX channel
> + * @pps_buf: 128 bytes to be written into PPS buffer for HDMI sink by PCON.
> + *
> + * Returns 0 on success, else returns negative error code.
> + * */
> +int drm_dp_pcon_pps_override_buf(struct drm_dp_aux *aux, u8
> +pps_buf[128]) {
> +	int ret;
> +
> +	ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVERRIDE_BASE,
> &pps_buf, 128);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = drm_dp_pcon_configure_dsc_enc(aux,
> DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_pcon_pps_override_buf);
> +
> +/*
> + * drm_dp_pcon_pps_override_param() - Write PPS parameters to DSC
> +encoder
> + * override registers
> + * @aux: DisplayPort AUX channel
> + * @pps_param: 3 Parameters (2 Bytes each) : Slice Width, Slice Height,
> + * bits_per_pixel.
> + *
> + * Returns 0 on success, else returns negative error code.
> + * */
> +int drm_dp_pcon_pps_override_param(struct drm_dp_aux *aux, u8
> +pps_param[6]) {
> +	int ret;
> +
> +	ret = drm_dp_dpcd_write(aux,
> DP_PCON_HDMI_PPS_OVRD_SLICE_HEIGHT, &pps_param[0], 2);
> +	if (ret < 0)
> +		return ret;
> +	ret = drm_dp_dpcd_write(aux,
> DP_PCON_HDMI_PPS_OVRD_SLICE_WIDTH, &pps_param[2], 2);
> +	if (ret < 0)
> +		return ret;
> +	ret = drm_dp_dpcd_write(aux, DP_PCON_HDMI_PPS_OVRD_BPP,
> &pps_param[4], 2);
> +	if (ret < 0)
> +		return ret;
> +
> +	ret = drm_dp_pcon_configure_dsc_enc(aux,
> DP_PCON_ENC_PPS_OVERRIDE_EN_BUFFER);
> +	if (ret < 0)
> +		return ret;
> +
> +	return 0;
> +}
> +EXPORT_SYMBOL(drm_dp_pcon_pps_override_param);
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h index
> bdbe9bbdb244..a1565498a798 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -441,6 +441,84 @@ struct drm_device;
>  # define DP_FEC_CORR_BLK_ERROR_COUNT_CAP    (1 << 2)
>  # define DP_FEC_BIT_ERROR_COUNT_CAP	    (1 << 3)
> 
> +/* DP-HDMI2.1 PCON DSC ENCODER SUPPORT */
> +#define DP_PCON_DSC_ENCODER_CAP_SIZE        0xC	/* 0x9E - 0x92 */
> +#define DP_PCON_DSC_ENCODER                 0x092
> +# define DP_PCON_DSC_ENCODER_SUPPORTED      (1 << 0)
> +# define DP_PCON_DSC_PPS_ENC_OVERRIDE       (1 << 1)
> +
> +/* DP-HDMI2.1 PCON DSC Version */
> +#define DP_PCON_DSC_VERSION                 0x093
> +# define DP_PCON_DSC_MAJOR_MASK		    (0xF << 0)
> +# define DP_PCON_DSC_MINOR_MASK		    (0xF << 4)
> +# define DP_PCON_DSC_MAJOR_SHIFT	    0
> +# define DP_PCON_DSC_MINOR_SHIFT	    4
> +
> +/* DP-HDMI2.1 PCON DSC RC Buffer block size */
> +#define DP_PCON_DSC_RC_BUF_BLK_INFO	    0x094
> +# define DP_PCON_DSC_RC_BUF_BLK_SIZE	    (0x3 << 0)
> +# define DP_PCON_DSC_RC_BUF_BLK_1KB	    0
> +# define DP_PCON_DSC_RC_BUF_BLK_4KB	    1
> +# define DP_PCON_DSC_RC_BUF_BLK_16KB	    2
> +# define DP_PCON_DSC_RC_BUF_BLK_64KB	    3
> +
> +/* DP-HDMI2.1 PCON DSC RC Buffer size */
> +#define DP_PCON_DSC_RC_BUF_SIZE		    0x095
> +
> +/* DP-HDMI2.1 PCON DSC Slice capabilities-1 */
> +#define DP_PCON_DSC_SLICE_CAP_1		    0x096
> +# define DP_PCON_DSC_1_PER_DSC_ENC     (0x1 << 0)
> +# define DP_PCON_DSC_2_PER_DSC_ENC     (0x1 << 1)
> +# define DP_PCON_DSC_4_PER_DSC_ENC     (0x1 << 3)
> +# define DP_PCON_DSC_6_PER_DSC_ENC     (0x1 << 4)
> +# define DP_PCON_DSC_8_PER_DSC_ENC     (0x1 << 5)
> +# define DP_PCON_DSC_10_PER_DSC_ENC    (0x1 << 6)
> +# define DP_PCON_DSC_12_PER_DSC_ENC    (0x1 << 7)
> +
> +#define DP_PCON_DSC_BUF_BIT_DEPTH	    0x097
> +# define DP_PCON_DSC_BIT_DEPTH_MASK	    (0xF << 0)
> +# define DP_PCON_DSC_DEPTH_9_BITS	    0
> +# define DP_PCON_DSC_DEPTH_10_BITS	    1
> +# define DP_PCON_DSC_DEPTH_11_BITS	    2
> +# define DP_PCON_DSC_DEPTH_12_BITS	    3
> +# define DP_PCON_DSC_DEPTH_13_BITS	    4
> +# define DP_PCON_DSC_DEPTH_14_BITS	    5
> +# define DP_PCON_DSC_DEPTH_15_BITS	    6
> +# define DP_PCON_DSC_DEPTH_16_BITS	    7
> +# define DP_PCON_DSC_DEPTH_8_BITS	    8
> +
> +#define DP_PCON_DSC_BLOCK_PREDICTION	    0x098
> +# define DP_PCON_DSC_BLOCK_PRED_SUPPORT	    (0x1 << 0)
> +
> +#define DP_PCON_DSC_ENC_COLOR_FMT_CAP	    0x099
> +# define DP_PCON_DSC_ENC_RGB		    (0x1 << 0)
> +# define DP_PCON_DSC_ENC_YUV444		    (0x1 << 1)
> +# define DP_PCON_DSC_ENC_YUV422_S	    (0x1 << 2)
> +# define DP_PCON_DSC_ENC_YUV422_N	    (0x1 << 3)
> +# define DP_PCON_DSC_ENC_YUV420_N	    (0x1 << 4)
> +
> +#define DP_PCON_DSC_ENC_COLOR_DEPTH_CAP	    0x09A
> +# define DP_PCON_DSC_ENC_8BPC		    (0x1 << 1)
> +# define DP_PCON_DSC_ENC_10BPC		    (0x1 << 2)
> +# define DP_PCON_DSC_ENC_12BPC		    (0x1 << 3)
> +
> +#define DP_PCON_DSC_MAX_SLICE_WIDTH	    0x09B
> +
> +/* DP-HDMI2.1 PCON DSC Slice capabilities-2 */
> +#define DP_PCON_DSC_SLICE_CAP_2             0x09C
> +# define DP_PCON_DSC_16_PER_DSC_ENC	    (0x1 << 0)
> +# define DP_PCON_DSC_20_PER_DSC_ENC         (0x1 << 1)
> +# define DP_PCON_DSC_24_PER_DSC_ENC         (0x1 << 2)
> +
> +/* DP-HDMI2.1 PCON HDMI TX Encoder Bits/pixel increment */
> +#define DP_PCON_DSC_BPP_INCR		    0x09E
> +# define DP_PCON_DSC_BPP_INCR_MASK	    (0x7 << 0)
> +# define DP_PCON_DSC_ONE_16TH_BPP	    0
> +# define DP_PCON_DSC_ONE_8TH_BPP	    1
> +# define DP_PCON_DSC_ONE_4TH_BPP	    2
> +# define DP_PCON_DSC_ONE_HALF_BPP	    3
> +# define DP_PCON_DSC_ONE_BPP		    4
> +
>  /* DP Extended DSC Capabilities */
>  #define DP_DSC_BRANCH_OVERALL_THROUGHPUT_0  0x0a0   /* DP 1.4a SCR */
>  #define DP_DSC_BRANCH_OVERALL_THROUGHPUT_1  0x0a1 @@ -1134,6
> +1212,12 @@ struct drm_device;
>  # define DP_HDMI_FORCE_SCRAMBLING		(1 << 3) /* DP 1.4 */
>  #define DP_PROTOCOL_CONVERTER_CONTROL_2		0x3052 /* DP 1.3
> */
>  # define DP_CONVERSION_TO_YCBCR422_ENABLE	(1 << 0) /* DP 1.3 */
> +# define DP_PCON_ENABLE_DSC_ENCODER	        (1 << 1)
> +# define DP_PCON_ENCODER_PPS_OVERRIDE_MASK	(0x3 << 2)
> +# 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
> +
> 
>  /* PCON Downstream HDMI ERROR Status per Lane */
>  #define DP_PCON_HDMI_ERROR_STATUS_LN0          0x3037
> @@ -1145,6 +1229,29 @@ struct drm_device;
>  # define DP_PCON_HDMI_ERROR_COUNT_TEN_PLUS     (1 << 1)
>  # define DP_PCON_HDMI_ERROR_COUNT_HUNDRED_PLUS (1 << 2)
> 
> +/* PCON HDMI CONFIG PPS Override Buffer
> + * Valid Offsets to be added to Base : 0-127  */
> +#define DP_PCON_HDMI_PPS_OVERRIDE_BASE        0x3100
> +
> +/* PCON HDMI CONFIG PPS Override Parameter: Slice height
> + * Offset-0 8LSBs of the Slice height.
> + * Offset-1 8MSBs of the Slice height.
> + */
> +#define DP_PCON_HDMI_PPS_OVRD_SLICE_HEIGHT    0x3180
> +
> +/* PCON HDMI CONFIG PPS Override Parameter: Slice width
> + * Offset-0 8LSBs of the Slice width.
> + * Offset-1 8MSBs of the Slice width.
> + */
> +#define DP_PCON_HDMI_PPS_OVRD_SLICE_WIDTH    0x3182
> +
> +/* PCON HDMI CONFIG PPS Override Parameter: bits_per_pixel
> + * Offset-0 8LSBs of the bits_per_pixel.
> + * Offset-1 2MSBs of the bits_per_pixel.
> + */
> +#define DP_PCON_HDMI_PPS_OVRD_BPP	     0x3184
> +
>  /* HDCP 1.3 and HDCP 2.2 */
>  #define DP_AUX_HDCP_BKSV		0x68000
>  #define DP_AUX_HDCP_RI_PRIME		0x68005
> @@ -2064,5 +2171,12 @@ bool drm_dp_pcon_hdmi_link_active(struct
> drm_dp_aux *aux);  int drm_dp_pcon_hdmi_link_mode(struct drm_dp_aux
> *aux, u8 *frl_trained_mask);  void
> drm_dp_pcon_hdmi_frl_link_error_count(struct drm_dp_aux *aux,
>  					  struct drm_connector *connector);
> +bool drm_dp_pcon_enc_is_dsc_1_2(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]);
> +int drm_dp_pcon_dsc_max_slices(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]);
> +int drm_dp_pcon_dsc_max_slice_width(const u8
> +pcon_dsc_dpcd[DP_PCON_DSC_ENCODER_CAP_SIZE]);
> +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]);
> 
>  #endif /* _DRM_DP_HELPER_H_ */
> --
> 2.17.1

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