linux-kernel - [v2] drm/msm/disp/dpu1: set default group ID for CTL.

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Date:   Fri, 29 Oct 2021 05:30:19 -0700
From:   Kalyan Thota <quic_kalyant@...cinc.com>
To:     y@...lcomm.com, dri-devel@...ts.freedesktop.org,
        linux-arm-msm@...r.kernel.org, freedreno@...ts.freedesktop.org,
        devicetree@...r.kernel.org
Cc:     Kalyan Thota <quic_kalyant@...cinc.com>,
        linux-kernel@...r.kernel.org, robdclark@...il.com,
        dianders@...omium.org, mkrishn@...eaurora.org, swboyd@...omium.org,
        abhinavk@...eaurora.org
Subject: [v2] 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@...cinc.com>
---
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c | 2 +-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h | 5 ++++-
 drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c     | 8 ++++++++
 3 files changed, 13 insertions(+), 2 deletions(-)

diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
index ce6f32a..283605c 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.c
+++ b/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)
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
index 4ade44b..31af04a 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_catalog.h
+++ b/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
 };
 
diff --git a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c b/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
index 64740ddb..02da9ec 100644
--- a/drivers/gpu/drm/msm/disp/dpu1/dpu_hw_ctl.c
+++ b/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);
 
-- 
2.7.4