drm/msm/disp/dpu1: set default group ID for CTL.

New required programming in CTL for SC7280. Group ID informs
HW of which VM owns that CTL. Force this group ID to
default/disabled until virtualization support is enabled in SW.

Changes in v1:
 - Fix documentation and add descritpion for the change (Stephen)
Signed-off-by: Kalyan Thota <quic_kalyant@quicinc.com>
Reviewed-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Reviewed-by: Stephen Boyd <swboyd@chromium.org>
Link: https://lore.kernel.org/r/1635510619-6715-1-git-send-email-quic_kalyant@quicinc.comSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c

@@ -45,7 +45,7 @@
 	(PINGPONG_SDM845_MASK | BIT(DPU_PINGPONG_TE2))
 
 #define CTL_SC7280_MASK \
-	(BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE))
+	(BIT(DPU_CTL_ACTIVE_CFG) | BIT(DPU_CTL_FETCH_ACTIVE) | BIT(DPU_CTL_VM_CFG))
 
 #define MERGE_3D_SM8150_MASK (0)
 

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h

@@ -179,13 +179,16 @@ enum {
 
 /**
  * CTL sub-blocks
- * @DPU_CTL_SPLIT_DISPLAY       CTL supports video mode split display
+ * @DPU_CTL_SPLIT_DISPLAY:	CTL supports video mode split display
+ * @DPU_CTL_FETCH_ACTIVE:	Active CTL for fetch HW (SSPPs)
+ * @DPU_CTL_VM_CFG:		CTL config to support multiple VMs
  * @DPU_CTL_MAX
  */
 enum {
 	DPU_CTL_SPLIT_DISPLAY = 0x1,
 	DPU_CTL_ACTIVE_CFG,
 	DPU_CTL_FETCH_ACTIVE,
+	DPU_CTL_VM_CFG,
 	DPU_CTL_MAX
 };
 

drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c

@@ -36,6 +36,7 @@
 #define  MERGE_3D_IDX   23
 #define  INTF_IDX       31
 #define CTL_INVALID_BIT                 0xffff
+#define CTL_DEFAULT_GROUP_ID		0xf
 
 static const u32 fetch_tbl[SSPP_MAX] = {CTL_INVALID_BIT, 16, 17, 18, 19,
 	CTL_INVALID_BIT, CTL_INVALID_BIT, CTL_INVALID_BIT, CTL_INVALID_BIT, 0,
@@ -498,6 +499,13 @@ static void dpu_hw_ctl_intf_cfg_v1(struct dpu_hw_ctl *ctx,
 	u32 intf_active = 0;
 	u32 mode_sel = 0;
 
+	/* CTL_TOP[31:28] carries group_id to collate CTL paths
+	 * per VM. Explicitly disable it until VM support is
+	 * added in SW. Power on reset value is not disable.
+	 */
+	if ((test_bit(DPU_CTL_VM_CFG, &ctx->caps->features)))
+		mode_sel = CTL_DEFAULT_GROUP_ID  << 28;
+
 	if (cfg->intf_mode_sel == DPU_CTL_MODE_SEL_CMD)
 		mode_sel |= BIT(17);