[PATCH 04/16] drm/i915/vdsc: Introduce 3rd VDSC engine VDSC2

[Ankit Nautiyal]

Introduce the register bits to enable the 3rd DSC engine VDSC2.
Add support to read/write these bits.

v2: Only introduce bits that are used and update the subject and commit
message. (Suraj)

Signed-off-by: Ankit Nautiyal <ankit.k.nautiyal at intel.com>
---
 drivers/gpu/drm/i915/display/intel_vdsc.c     | 20 +++++++++++++++----
 .../gpu/drm/i915/display/intel_vdsc_regs.h    |  2 ++
 2 files changed, 18 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 198446738662..70b75de921de 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -380,6 +380,8 @@ intel_dsc_power_domain(struct intel_crtc *crtc, enum transcoder cpu_transcoder)
 static int intel_dsc_get_vdsc_per_pipe(const struct intel_crtc_state *crtc_state)
 {
 	switch (crtc_state->dsc.dsc_split) {
+	case 3:
+		return 3;
 	case 2:
 		return 2;
 	case 0:
@@ -782,6 +784,12 @@ void intel_dsc_enable(const struct intel_crtc_state *crtc_state)
 		dss_ctl2_val |= VDSC1_ENABLE;
 		dss_ctl1_val |= JOINER_ENABLE;
 	}
+
+	if (vdsc_instances_per_pipe > 2) {
+		dss_ctl2_val |= VDSC2_ENABLE;
+		dss_ctl2_val |= SMALL_JOINER_CONFIG_3_ENGINES;
+	}
+
 	if (crtc_state->joiner_pipes) {
 		if (intel_crtc_ultrajoiner_enable_needed(crtc_state))
 			dss_ctl1_val |= ULTRA_JOINER_ENABLE;
@@ -983,11 +991,15 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
 	if (!crtc_state->dsc.compression_enable)
 		goto out;
 
-	if ((dss_ctl1 & JOINER_ENABLE) &&
-	    (dss_ctl2 & VDSC1_ENABLE))
-		crtc_state->dsc.dsc_split = 2;
-	else
+	if (dss_ctl1 & JOINER_ENABLE) {
+		if (dss_ctl2 & (VDSC2_ENABLE | SMALL_JOINER_CONFIG_3_ENGINES))
+			crtc_state->dsc.dsc_split = 3;
+
+		else if (dss_ctl2 & VDSC1_ENABLE)
+			crtc_state->dsc.dsc_split = 2;
+	} else {
 		crtc_state->dsc.dsc_split = 0;
+	}
 
 	intel_dsc_get_pps_config(crtc_state);
 out:
diff --git a/drivers/gpu/drm/i915/display/intel_vdsc_regs.h b/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
index d7a72b95ee7e..474a7f9f3881 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
+++ b/drivers/gpu/drm/i915/display/intel_vdsc_regs.h
@@ -22,6 +22,8 @@
 
 #define DSS_CTL2				_MMIO(0x67404)
 #define  VDSC0_ENABLE				REG_BIT(31)
+#define  VDSC2_ENABLE				REG_BIT(30)
+#define  SMALL_JOINER_CONFIG_3_ENGINES		REG_BIT(23)
 #define  VDSC1_ENABLE				REG_BIT(15)
 #define  RIGHT_DL_BUF_TARGET_DEPTH_MASK		(0xfff << 0)
 #define  RIGHT_DL_BUF_TARGET_DEPTH(pixels)	((pixels) << 0)
-- 
2.45.2