[Intel-gfx] [PATCH] drm/i915/tgl: add support to one DP-MST stream

[Ville Syrjälä]

On Mon, Oct 28, 2019 at 10:04:57AM -0700, Lucas De Marchi wrote:
> This is the minimum change to support 1 (and only 1) DP-MST monitor
> connected on Tiger Lake. This change was isolated from previous patch
> from José. In order to support more streams we will need to create a
> master-slave relation on the transcoders and that is currently not
> working yet.
> 
> Cc: José Roberto de Souza <jose.souza at intel.com>
> Signed-off-by: Lucas De Marchi <lucas.demarchi at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 4 ++++
>  drivers/gpu/drm/i915/i915_reg.h          | 3 +++
>  2 files changed, 7 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index 281594bcbfae..32d9c74c5838 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1905,6 +1905,10 @@ intel_ddi_transcoder_func_reg_val_get(const struct intel_crtc_state *crtc_state)
>  	} else if (intel_crtc_has_type(crtc_state, INTEL_OUTPUT_DP_MST)) {
>  		temp |= TRANS_DDI_MODE_SELECT_DP_MST;
>  		temp |= DDI_PORT_WIDTH(crtc_state->lane_count);
> +
> +		if (INTEL_GEN(dev_priv) >= 12)
> +			temp |= TRANS_DDI_MST_TRANSPORT_SELECT(
> +				crtc_state->cpu_transcoder);
>  	} else {
>  		temp |= TRANS_DDI_MODE_SELECT_DP_SST;
>  		temp |= DDI_PORT_WIDTH(crtc_state->lane_count);
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index dee3168efd86..e08c4ea3b747 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -9550,6 +9550,9 @@ enum skl_power_gate {
>  #define  TRANS_DDI_EDP_INPUT_A_ONOFF	(4 << 12)
>  #define  TRANS_DDI_EDP_INPUT_B_ONOFF	(5 << 12)
>  #define  TRANS_DDI_EDP_INPUT_C_ONOFF	(6 << 12)
> +#define  TRANS_DDI_MST_TRANSPORT_SELECT_SHIFT	10

unused.

> +#define  TRANS_DDI_MST_TRANSPORT_SELECT_MASK	REG_GENMASK(12, 10)
> +#define  TRANS_DDI_MST_TRANSPORT_SELECT(trans)	((trans) << 10)

I guess this should be REG_FIELD_PREP() if you want to be modern (as
your REG_GENMASK() usage suggests).

>  #define  TRANS_DDI_HDCP_SIGNALLING	(1 << 9)
>  #define  TRANS_DDI_DP_VC_PAYLOAD_ALLOC	(1 << 8)
>  #define  TRANS_DDI_HDMI_SCRAMBLER_CTS_ENABLE (1 << 7)
> -- 
> 2.23.0
> 
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-- 
Ville Syrjälä
Intel