Re: [Intel-gfx] [PATCH] drm/dp: Add Additional DP2 Headers

[Harry Wentland <harry.wentland@amd.com>]

On 2021-09-27 10:38, Fangzhi Zuo wrote:
> Include FEC, DSC, Link Training related headers.
> 
> Signed-off-by: Fangzhi Zuo <Jerry.Zuo@amd.com>

Please send this to dri-devel and amd-gfx as well.

> ---

The section after the '---' is not part of the commit
description. Please mention here that this patch is based
on top of the other DP2.0 header patches from Intel and
leave a link here, for context.

>  include/drm/drm_dp_helper.h | 20 ++++++++++++++++++++
>  1 file changed, 20 insertions(+)
> 
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 1d5b3dbb6e56..bfd8e3e0171d 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -453,6 +453,7 @@ struct drm_panel;
>  # define DP_FEC_UNCORR_BLK_ERROR_COUNT_CAP  (1 << 1)
>  # define DP_FEC_CORR_BLK_ERROR_COUNT_CAP    (1 << 2)
>  # define DP_FEC_BIT_ERROR_COUNT_CAP	    (1 << 3)
> +#define DP_FEC_CAPABILITY_1			0x091   /* 2.0 */
>  
>  /* DP-HDMI2.1 PCON DSC ENCODER SUPPORT */
>  #define DP_PCON_DSC_ENCODER_CAP_SIZE        0xC	/* 0x9E - 0x92 */
> @@ -537,6 +538,9 @@ struct drm_panel;
>  #define DP_DSC_BRANCH_OVERALL_THROUGHPUT_1  0x0a1
>  #define DP_DSC_BRANCH_MAX_LINE_WIDTH        0x0a2
>  
> +/* DFP Capability Extension */
> +#define DP_DFP_CAPABILITY_EXTENSION_SUPPORT	0x0a3	/* 2.0 */
> +
>  /* Link Configuration */
>  #define	DP_LINK_BW_SET		            0x100
>  # define DP_LINK_RATE_TABLE		    0x00    /* eDP 1.4 */
> @@ -688,6 +692,7 @@ struct drm_panel;
>  
>  #define DP_DSC_ENABLE                       0x160   /* DP 1.4 */
>  # define DP_DECOMPRESSION_EN                (1 << 0)
> +#define DP_DSC_CONFIGURATION				0x161	/* DP 2.0 */
>  
>  #define DP_PSR_EN_CFG				0x170   /* XXX 1.2? */
>  # define DP_PSR_ENABLE				BIT(0)
> @@ -743,6 +748,7 @@ struct drm_panel;
>  # define DP_RECEIVE_PORT_0_STATUS	    (1 << 0)
>  # define DP_RECEIVE_PORT_1_STATUS	    (1 << 1)
>  # define DP_STREAM_REGENERATION_STATUS      (1 << 2) /* 2.0 */
> +# define DP_INTRA_HOP_AUX_REPLY_INDICATION	(1 << 3) /* 2.0 */

Are you sure this is DP 2.0? The DP2.0 spec has 'RESERVED'
bits after the STREAM_REGENERATION_STATUS.

>  
>  #define DP_ADJUST_REQUEST_LANE0_1	    0x206
>  #define DP_ADJUST_REQUEST_LANE2_3	    0x207
> @@ -865,6 +871,8 @@ struct drm_panel;
>  # define DP_PHY_TEST_PATTERN_80BIT_CUSTOM   0x4
>  # define DP_PHY_TEST_PATTERN_CP2520         0x5
>  
> +#define DP_PHY_SQUARE_PATTERN				0x249
> +
>  #define DP_TEST_HBR2_SCRAMBLER_RESET        0x24A
>  #define DP_TEST_80BIT_CUSTOM_PATTERN_7_0    0x250
>  #define	DP_TEST_80BIT_CUSTOM_PATTERN_15_8   0x251
> @@ -1109,6 +1117,18 @@ struct drm_panel;
>  #define DP_128B132B_TRAINING_AUX_RD_INTERVAL   0x2216 /* 2.0 */
>  # define DP_128B132B_TRAINING_AUX_RD_INTERVAL_MASK 0x7f
>  
> +#define DP_TEST_264BIT_CUSTOM_PATTERN_7_0		0x2230
> +#define DP_TEST_264BIT_CUSTOM_PATTERN_263_256	0x2250
> +
> +/* DSC Extended Capability Branch Total DSC Resources */
> +#define DP_DSC_SUPPORT_AND_DECODER_COUNT			0x2260	/* 2.0 */

To align with the spec and make it easier to search this should be:
DP_DSC_SUPPORT_AND_DSC_DECODER_COUNT

> +#define DP_DSC_MAX_SLICE_COUNT_AND_AGGREGATION_0	0x2270	/* 2.0 */
> +# define DP_DSC_DECODER_0_MAXIMUM_SLICE_COUNT_MASK	(1 << 0)
> +# define DP_DSC_DECODER_0_AGGREGATION_SUPPORT_MASK	(0b111 << 1)
> +# define DP_DSC_DECODER_0_AGGREGATION_SUPPORT_SHIFT	1
> +# define DP_DSC_DECODER_COUNT_MASK			(0b111 << 5)
> +# define DP_DSC_DECODER_COUNT_SHIFT			5
> +

The spec seems to call these "DSC Decoder 1 Aggregation Support" and also
has a definition for "DSC Decoder 1 Maximum Slice Count"

Harry

>  /* Protocol Converter Extension */
>  /* HDMI CEC tunneling over AUX DP 1.3 section 5.3.3.3.1 DPCD 1.4+ */
>  #define DP_CEC_TUNNELING_CAPABILITY            0x3000
>