[Intel-gfx] [PATCH 1/2] drm/dp: Add HBR3 support in existing DRM DP helpers

[Harry Wentland]

On 2018-01-22 05:43 PM, Manasi Navare wrote:
> Existing helpers add support upto HBR2. This patch
> adds support for HBR3 rate (8.1 Gbps) introduced as
> part of DP 1.4 specification.
> 
> Cc: Rodrigo Vivi <rodrigo.vivi at intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>
> Cc: dri-devel at lists.freedesktop.org
> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>

Both patches look right according to DP 1.4 spec.

Series is
Reviewed-by: Harry Wentland <harry.wentland at amd.com>

Harry

> ---
>  drivers/gpu/drm/drm_dp_helper.c       | 4 ++++
>  drivers/gpu/drm/drm_dp_mst_topology.c | 3 +++
>  include/drm/drm_dp_helper.h           | 1 +
>  3 files changed, 8 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index adf79be..ffe14ec 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -146,6 +146,8 @@ u8 drm_dp_link_rate_to_bw_code(int link_rate)
>  		return DP_LINK_BW_2_7;
>  	case 540000:
>  		return DP_LINK_BW_5_4;
> +	case 810000:
> +		return DP_LINK_BW_8_1;
>  	}
>  }
>  EXPORT_SYMBOL(drm_dp_link_rate_to_bw_code);
> @@ -161,6 +163,8 @@ int drm_dp_bw_code_to_link_rate(u8 link_bw)
>  		return 270000;
>  	case DP_LINK_BW_5_4:
>  		return 540000;
> +	case DP_LINK_BW_8_1:
> +		return 810000;
>  	}
>  }
>  EXPORT_SYMBOL(drm_dp_bw_code_to_link_rate);
> diff --git a/drivers/gpu/drm/drm_dp_mst_topology.c b/drivers/gpu/drm/drm_dp_mst_topology.c
> index 70dcfa5..36df7df 100644
> --- a/drivers/gpu/drm/drm_dp_mst_topology.c
> +++ b/drivers/gpu/drm/drm_dp_mst_topology.c
> @@ -2087,6 +2087,9 @@ static bool drm_dp_get_vc_payload_bw(int dp_link_bw,
>  	case DP_LINK_BW_5_4:
>  		*out = 10 * dp_link_count;
>  		break;
> +	case DP_LINK_BW_8_1:
> +		*out = 15 * dp_link_count;
> +		break;
>  	}
>  	return true;
>  }
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 9d3ce3b..c80fa92 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -334,6 +334,7 @@
>  # define DP_LINK_BW_1_62		    0x06
>  # define DP_LINK_BW_2_7			    0x0a
>  # define DP_LINK_BW_5_4			    0x14    /* 1.2 */
> +# define DP_LINK_BW_8_1			    0x1e    /* 1.4 */
>  
>  #define DP_LANE_COUNT_SET	            0x101
>  # define DP_LANE_COUNT_MASK		    0x0f
>