[PATCH] drm/i915/display: Enable AS SDP Skip Frames

[Uma Shankar <uma.shankar@intel.com>]

Hardware provides mechanism to skip AS SDP for programmed
number of frames. Enable the same to drive to 1Hz if hardware
supports it.

Signed-off-by: Uma Shankar <uma.shankar@intel.com>
---
 drivers/gpu/drm/i915/display/intel_alpm.c     | 3 +++
 drivers/gpu/drm/i915/display/intel_psr_regs.h | 2 ++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/i915/display/intel_alpm.c b/drivers/gpu/drm/i915/display/intel_alpm.c
index b3334bc4d0f9..76a8919cdba2 100644
--- a/drivers/gpu/drm/i915/display/intel_alpm.c
+++ b/drivers/gpu/drm/i915/display/intel_alpm.c
@@ -395,6 +395,9 @@ 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 (DISPLAY_VER(display) >= 35)
+				pr_alpm_ctl |= PR_ALPM_CTL_ASSDP_SKIP_FRAMES(32);
+
 			intel_de_write(display, PR_ALPM_CTL(display, cpu_transcoder),
 				       pr_alpm_ctl);
 		}
diff --git a/drivers/gpu/drm/i915/display/intel_psr_regs.h b/drivers/gpu/drm/i915/display/intel_psr_regs.h
index 8afbf5a38335..8c35df795955 100644
--- a/drivers/gpu/drm/i915/display/intel_psr_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_psr_regs.h
@@ -268,6 +268,8 @@
 
 #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_ASSDP_SKIP_FRAMES_MASK			REG_GENMASK(27, 16)
+#define  PR_ALPM_CTL_ASSDP_SKIP_FRAMES(val)			REG_FIELD_PREP(PR_ALPM_CTL_ASSDP_SKIP_FRAMES_MASK, val)
 #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)
-- 
2.50.1