[PATCH 4/7] drm/i915/vdsc: Introduce 3rd VDSC engine VDSC2

[Ankit Nautiyal <ankit.k.nautiyal@intel.com>]

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@intel.com>
Reviewed-by: Suraj Kandpal <suraj.kandpal@intel.com>
---
 drivers/gpu/drm/i915/display/intel_vdsc.c      | 10 +++++++++-
 drivers/gpu/drm/i915/display/intel_vdsc_regs.h |  2 ++
 2 files changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/display/intel_vdsc.c b/drivers/gpu/drm/i915/display/intel_vdsc.c
index 159f83edd5b0..29b1aa7f4f94 100644
--- a/drivers/gpu/drm/i915/display/intel_vdsc.c
+++ b/drivers/gpu/drm/i915/display/intel_vdsc.c
@@ -775,6 +775,12 @@ 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;
@@ -977,7 +983,9 @@ void intel_dsc_get_config(struct intel_crtc_state *crtc_state)
 		goto out;
 
 	if (dss_ctl1 & JOINER_ENABLE) {
-		if (dss_ctl2 & VDSC1_ENABLE)
+		if (dss_ctl2 & (VDSC2_ENABLE | SMALL_JOINER_CONFIG_3_ENGINES))
+			crtc_state->dsc.num_streams = 3;
+		else if (dss_ctl2 & VDSC1_ENABLE)
 			crtc_state->dsc.num_streams = 2;
 		else
 			crtc_state->dsc.num_streams = 1;
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