Re: [PATCH v9 5/8] drm/i915/display: Add support for pack and unpack

["Nautiyal, Ankit K" <ankit.k.nautiyal@xxxxxxxxx>]

On 5/24/2024 3:54 PM, Mitul Golani wrote:
> Add support of pack and unpack for target_rr_divider.
>
> --v2:
> - Set Target Refresh Rate Divider bit when related
> AS SDP bit is set (Ankit).
>
> Signed-off-by: Mitul Golani <mitulkumar.ajitkumar.golani@xxxxxxxxx>
> ---
>   drivers/gpu/drm/i915/display/intel_dp.c | 4 ++++
>   1 file changed, 4 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index c0a3b6d50681..15aab14c4206 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -4230,6 +4230,9 @@ static ssize_t intel_dp_as_sdp_pack(const struct drm_dp_as_sdp *as_sdp,
>   	sdp->db[3] = as_sdp->target_rr & 0xFF;
>   	sdp->db[4] = (as_sdp->target_rr >> 8) & 0x3;
>   
> +	if (as_sdp->target_rr_divider)
> +		sdp->db[4] |= 0x20;
> +
>   	return length;
>   }
>   
> @@ -4410,6 +4413,7 @@ int intel_dp_as_sdp_unpack(struct drm_dp_as_sdp *as_sdp,
>   	as_sdp->mode = sdp->db[0] & DP_ADAPTIVE_SYNC_SDP_OPERATION_MODE;
>   	as_sdp->vtotal = (sdp->db[2] << 8) | sdp->db[1];
>   	as_sdp->target_rr = (u64)sdp->db[3] | ((u64)sdp->db[4] & 0x3);
> +	as_sdp->target_rr_divider = sdp->db[4] & 0x20;

Missed to point this last time: target_rr_divider is a bool so perhaps:

as_sdp->target_rr_divider = sdp->db[4] & 0x20 ? true : false

Regards,

Ankit

>   
>   	return 0;
>   }