On Mon, 2019-10-28 at 10:04 -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.
Reviewed-by: José Roberto de Souza <jose.souza@xxxxxxxxx>
>
> Cc: José Roberto de Souza <jose.souza@xxxxxxxxx>
> Signed-off-by: Lucas De Marchi <lucas.demarchi@xxxxxxxxx>
> ---
> 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
> +#define TRANS_DDI_MST_TRANSPORT_SELECT_MASK REG_GENMASK(12, 10)
> +#define TRANS_DDI_MST_TRANSPORT_SELECT(trans) ((trans) << 10)
> #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)
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