On Thu, 07 Oct 2021, Animesh Manna <animesh.manna@xxxxxxxxx> wrote:
> TRANS_DP2_CTL register is programmed to enable panel replay from source
> and sink is enabled through panel replay dpcd configuration address.
>
> Signed-off-by: Animesh Manna <animesh.manna@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_psr.c | 30 ++++++++++++++++++++----
> drivers/gpu/drm/i915/i915_reg.h | 1 +
> include/drm/drm_dp_helper.h | 3 +++
> 3 files changed, 30 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_psr.c b/drivers/gpu/drm/i915/display/intel_psr.c
> index 935ea1c434ac..197cab7551c6 100644
> --- a/drivers/gpu/drm/i915/display/intel_psr.c
> +++ b/drivers/gpu/drm/i915/display/intel_psr.c
> @@ -370,8 +370,14 @@ static void intel_psr_enable_sink(struct intel_dp *intel_dp)
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> u8 dpcd_val = DP_PSR_ENABLE;
>
> - /* Enable ALPM at sink for psr2 */
> + if (intel_dp->psr.enabled && !intel_dp_is_edp(intel_dp)) {
> + drm_dp_dpcd_writeb(&intel_dp->aux, PANEL_REPLAY_CONFIG,
> + PANEL_REPLAY_ENABLE);
> + return;
> + }
> +
> if (intel_dp->psr.psr2_enabled) {
> + /* Enable ALPM at sink for psr2 */
> drm_dp_dpcd_writeb(&intel_dp->aux, DP_RECEIVER_ALPM_CONFIG,
> DP_ALPM_ENABLE |
> DP_ALPM_LOCK_ERROR_IRQ_HPD_ENABLE);
> @@ -498,6 +504,17 @@ static u32 intel_psr2_get_tp_time(struct intel_dp *intel_dp)
> return val;
> }
>
> +static void dg2_activate_panel_replay(struct intel_dp *intel_dp)
> +{
> + struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> +
> + intel_de_write(dev_priv, PSR2_MAN_TRK_CTL(intel_dp->psr.transcoder),
> + ADLP_PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE);
> +
> + intel_de_rmw(dev_priv, TRANS_DP2_CTL(intel_dp->psr.transcoder), 0,
> + TRANS_DP2_PANEL_REPLAY_ENABLE);
> +}
> +
> static void hsw_activate_psr2(struct intel_dp *intel_dp)
> {
> struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> @@ -1067,8 +1084,10 @@ static void intel_psr_activate(struct intel_dp *intel_dp)
> drm_WARN_ON(&dev_priv->drm, intel_dp->psr.active);
> lockdep_assert_held(&intel_dp->psr.lock);
>
> - /* psr1 and psr2 are mutually exclusive.*/
> - if (intel_dp->psr.psr2_enabled)
> + /* psr1, psr2 and panel-replay are mutually exclusive.*/
> + if (intel_dp->psr.enabled && !intel_dp_is_edp(intel_dp))
> + dg2_activate_panel_replay(intel_dp);
> + else if (intel_dp->psr.psr2_enabled)
> hsw_activate_psr2(intel_dp);
> else
> hsw_activate_psr1(intel_dp);
> @@ -1241,7 +1260,10 @@ static void intel_psr_exit(struct intel_dp *intel_dp)
> return;
> }
>
> - if (intel_dp->psr.psr2_enabled) {
> + if (intel_dp->psr.enabled && !intel_dp_is_edp(intel_dp)) {
> + intel_de_rmw(dev_priv, TRANS_DP2_CTL(intel_dp->psr.transcoder),
> + TRANS_DP2_PANEL_REPLAY_ENABLE, 0);
> + } else if (intel_dp->psr.psr2_enabled) {
> tgl_disallow_dc3co_on_psr2_exit(intel_dp);
> val = intel_de_read(dev_priv,
> EDP_PSR2_CTL(intel_dp->psr.transcoder));
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index a897f4abea0c..6cc6ebcd3bdb 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -4725,6 +4725,7 @@ enum {
> #define PSR2_MAN_TRK_CTL_SF_SINGLE_FULL_FRAME REG_BIT(3)
> #define PSR2_MAN_TRK_CTL_SF_CONTINUOS_FULL_FRAME REG_BIT(2)
> #define PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE REG_BIT(1)
> +#define ADLP_PSR2_MAN_TRK_CTL_SF_PARTIAL_FRAME_UPDATE REG_BIT(31)
> #define ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR_MASK REG_GENMASK(28, 16)
> #define ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR(val) REG_FIELD_PREP(ADLP_PSR2_MAN_TRK_CTL_SU_REGION_START_ADDR_MASK, val)
> #define ADLP_PSR2_MAN_TRK_CTL_SU_REGION_END_ADDR_MASK REG_GENMASK(12, 0)
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index d18340cbf8ac..4b95289e6edf 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -712,6 +712,9 @@ struct drm_panel;
> #define DP_BRANCH_DEVICE_CTRL 0x1a1
> # define DP_BRANCH_DEVICE_IRQ_HPD (1 << 0)
>
> +#define PANEL_REPLAY_CONFIG 0x1b0
> +# define PANEL_REPLAY_ENABLE (1 << 0)
> +
Previous patch has:
+#define DP_PANEL_REPLAY_SUPPORT 0x0b0
+# define PANEL_REPLAY_SUPPORT (1 << 0)
+
Also, it's called "PANEL REPLAY CAPABILITY SUPPORTED" in the spec, so
DP_PANEL_REPLAY_CAP or something sounds more like it.
> #define DP_PAYLOAD_ALLOCATE_SET 0x1c0
> #define DP_PAYLOAD_ALLOCATE_START_TIME_SLOT 0x1c1
> #define DP_PAYLOAD_ALLOCATE_TIME_SLOT_COUNT 0x1c2
--
Jani Nikula, Intel Open Source Graphics Center
