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drm/i915/display: Enable DC3CO idle protocol in ALPM

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Add PR_ALPM_CTL_USE_DC3CO_IDLE_PROTOCOL bit definition and set it
when DC3CO is allowed.

Changes in v2:
- Squash "Define DC3CO idle protocol bit in PR_ALPM_CTL"
  into this patch (Uma Shankar)
- Use intel_display_power_dc3co_allowed(display)
  instead of intel_dc3co_allowed(state)

Changes in v3:
- check only intel_display_power_dc3co_allowed()
  before wiriting PR_ALPM_CTL_USE_DC3CO_IDLE_PROTOCOL (Jani Nikula)

BSpec: 75253
Signed-off-by: Dibin Moolakadan Subrahmanian <dibin.moolakadan.subrahmanian@intel.com>
Reviewed-by: Uma Shankar <uma.shankar@intel.com>
Reviewed-by: Animesh Manna <animesh.manna@intel.com>
Signed-off-by: Animesh Manna <animesh.manna@intel.com>
Link: https://patch.msgid.link/20260616162154.2630995-12-dibin.moolakadan.subrahmanian@intel.com
This commit is contained in:
Dibin Moolakadan Subrahmanian 2026-06-16 21:51:49 +05:30 committed by Animesh Manna
parent c525b2f81d
commit 645a651450
2 changed files with 6 additions and 0 deletions
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5
drivers/gpu/drm/i915/display/intel_alpm.c
View File

@ -407,6 +407,11 @@ static void lnl_alpm_configure(struct intel_dp *intel_dp,
if (crtc_state->disable_as_sdp_when_pr_active)
pr_alpm_ctl |= PR_ALPM_CTL_AS_SDP_TRANSMISSION_IN_ACTIVE_DISABLE;
if (intel_display_power_dc3co_allowed(display))
pr_alpm_ctl |= PR_ALPM_CTL_USE_DC3CO_IDLE_PROTOCOL;
else
pr_alpm_ctl &= ~PR_ALPM_CTL_USE_DC3CO_IDLE_PROTOCOL;
intel_de_write(display, PR_ALPM_CTL(display, cpu_transcoder),
pr_alpm_ctl);
}

1
drivers/gpu/drm/i915/display/intel_psr_regs.h
View File

@ -268,6 +268,7 @@
#define _PR_ALPM_CTL_A 0x60948
#define PR_ALPM_CTL(dev_priv, tran) _MMIO_TRANS2(dev_priv, tran, _PR_ALPM_CTL_A)
#define PR_ALPM_CTL_USE_DC3CO_IDLE_PROTOCOL BIT(7)
#define PR_ALPM_CTL_ALLOW_LINK_OFF_BETWEEN_AS_SDP_AND_SU BIT(6)
#define PR_ALPM_CTL_RFB_UPDATE_CONTROL BIT(5)
#define PR_ALPM_CTL_AS_SDP_TRANSMISSION_IN_ACTIVE_DISABLE BIT(4)