On Wed, 21 Dec 2016, vathsala nagaraju <vathsala.nagaraju@xxxxxxxxx> wrote:
> Function hsw_psr_setup handles vsc header setup for psr1 and
> skl_psr_setup_vsc handles vsc header setup for psr2.
>
> Setup VSC header in function skl_psr_setup_vsc for psr2 support,
> as per edp 1.4 spec, table 6-11:VSC SDP HEADER Extension for psr2
> operation.
>
> Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
> Cc: Jim Bride <jim.bride@xxxxxxxxxxxxxxx>
> Signed-off-by: Vathsala Nagaraju <vathsala.nagaraju@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/i915_drv.h | 2 ++
> drivers/gpu/drm/i915/intel_dp.c | 24 ++++++++++++++++++++++++
> drivers/gpu/drm/i915/intel_psr.c | 17 +++++++++++++++--
> 3 files changed, 41 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
> index 77d7a07..95ff959 100644
> --- a/drivers/gpu/drm/i915/i915_drv.h
> +++ b/drivers/gpu/drm/i915/i915_drv.h
> @@ -1232,6 +1232,8 @@ struct i915_psr {
> bool psr2_support;
> bool aux_frame_sync;
> bool link_standby;
> + bool y_cord_support;
> + bool colorimetry_support;
> };
>
> enum intel_pch {
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 66b5bc8..0c9bb66 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -3041,6 +3041,22 @@ static void chv_dp_post_pll_disable(struct intel_encoder *encoder,
> DP_LINK_STATUS_SIZE) == DP_LINK_STATUS_SIZE;
> }
>
> +bool intel_dp_get_y_cord_status(struct intel_dp *intel_dp)
static. Sparse would have told you about this.
> +{
> + uint8_t psr_caps;
Please initialize psr_caps = 0 to default to false in case aux fails. If
the compiler is smart enough, it might even warn you about this.
> +
> + drm_dp_dpcd_readb(&intel_dp->aux, DP_PSR_CAPS, &psr_caps);
> + return (psr_caps & DP_PSR_Y_COORDINATE);
Unnecessary braces.
> +}
> +
> +bool intel_dp_get_colorimetry_status(struct intel_dp *intel_dp)
> +{
> + uint8_t dprx;
> +
> + drm_dp_dpcd_readb(&intel_dp->aux, DPRX_FEATURE_ENUMERATION_LIST, &dprx);
> + return (dprx & VSC_SDP_EXT_FOR_COLORIMETRY_SUPPORTED);
Same things here as in intel_dp_get_y_cord_status.
> +}
> +
> /* These are source-specific values. */
> uint8_t
> intel_dp_voltage_max(struct intel_dp *intel_dp)
> @@ -3619,6 +3635,14 @@ void intel_dp_set_idle_link_train(struct intel_dp *intel_dp)
> dev_priv->psr.psr2_support = dev_priv->psr.aux_frame_sync;
> DRM_DEBUG_KMS("PSR2 %s on sink",
> dev_priv->psr.psr2_support ? "supported" : "not supported");
> +
> + if (dev_priv->psr.psr2_support) {
> + dev_priv->psr.y_cord_support =
> + intel_dp_get_y_cord_status(intel_dp);
> + dev_priv->psr.colorimetry_support =
> + intel_dp_get_colorimetry_status(intel_dp);
The indentation doesn't seem to be right for the continuation lines.
> + }
> +
> }
>
> /* Read the eDP Display control capabilities registers */
> diff --git a/drivers/gpu/drm/i915/intel_psr.c b/drivers/gpu/drm/i915/intel_psr.c
> index 6aca8ff..c3aa649 100644
> --- a/drivers/gpu/drm/i915/intel_psr.c
> +++ b/drivers/gpu/drm/i915/intel_psr.c
> @@ -122,13 +122,26 @@ static void vlv_psr_setup_vsc(struct intel_dp *intel_dp)
> static void skl_psr_setup_su_vsc(struct intel_dp *intel_dp)
> {
> struct edp_vsc_psr psr_vsc;
> + struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
> + struct drm_device *dev = intel_dig_port->base.base.dev;
> + struct drm_i915_private *dev_priv = to_i915(dev);
>
> /* Prepare VSC Header for SU as per EDP 1.4 spec, Table 6.11 */
> memset(&psr_vsc, 0, sizeof(psr_vsc));
> psr_vsc.sdp_header.HB0 = 0;
> psr_vsc.sdp_header.HB1 = 0x7;
> - psr_vsc.sdp_header.HB2 = 0x3;
> - psr_vsc.sdp_header.HB3 = 0xb;
> + if (dev_priv->psr.colorimetry_support &&
> + dev_priv->psr.y_cord_support) {
> + psr_vsc.sdp_header.HB2 = 0x5;
> + psr_vsc.sdp_header.HB3 = 0x13;
> + } else if (dev_priv->psr.y_cord_support) {
> + psr_vsc.sdp_header.HB2 = 0x4;
> + psr_vsc.sdp_header.HB3 = 0xe;
> + } else {
> + psr_vsc.sdp_header.HB2 = 0x3;
> + psr_vsc.sdp_header.HB3 = 0xc;
> + }
Rodrigo, I'm leaving the review of these to you. ;)
BR,
Jani.
> +
> intel_psr_write_vsc(intel_dp, &psr_vsc);
> }
--
Jani Nikula, Intel Open Source Technology Center
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