linux-kernel - [PATCH v2 11/16] drm/msm: Add support for IFPC

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Message-Id: <20250908-ifpc-support-v2-11-631b1080bf91@oss.qualcomm.com>
Date: Mon, 08 Sep 2025 13:57:04 +0530
From: Akhil P Oommen <akhilpo@....qualcomm.com>
To: Rob Clark <robin.clark@....qualcomm.com>, Sean Paul <sean@...rly.run>,
        Konrad Dybcio <konradybcio@...nel.org>,
        Dmitry Baryshkov <lumag@...nel.org>,
        Abhinav Kumar <abhinav.kumar@...ux.dev>,
        Jessica Zhang <jessica.zhang@....qualcomm.com>,
        Marijn Suijten <marijn.suijten@...ainline.org>,
        David Airlie <airlied@...il.com>, Simona Vetter <simona@...ll.ch>,
        Antonino Maniscalco <antomani103@...il.com>,
        Neil Armstrong <neil.armstrong@...aro.org>
Cc: linux-arm-msm@...r.kernel.org, dri-devel@...ts.freedesktop.org,
        freedreno@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
        Akhil P Oommen <akhilpo@....qualcomm.com>
Subject: [PATCH v2 11/16] drm/msm: Add support for IFPC

Add a new quirk to denote IFPC (Inter-Frame Power Collapse) support
for a gpu. Based on this flag send the feature ctrl hfi message to
GMU to enable IFPC support.

Signed-off-by: Akhil P Oommen <akhilpo@....qualcomm.com>
---
 drivers/gpu/drm/msm/adreno/a6xx_gmu.c   |  5 +++--
 drivers/gpu/drm/msm/adreno/a6xx_hfi.c   | 34 +++++++++++++++++++++++++++------
 drivers/gpu/drm/msm/adreno/adreno_gpu.h |  1 +
 3 files changed, 32 insertions(+), 8 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
index 18f5fc2c28e33d81ccc248216cc018300c81eb77..d6297cc7fe664a74224c441e877050612714a3e4 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gmu.c
@@ -1961,8 +1961,9 @@ int a6xx_gmu_init(struct a6xx_gpu *a6xx_gpu, struct device_node *node)
 	if (ret)
 		return ret;
 
-	/* Fow now, don't do anything fancy until we get our feet under us */
-	gmu->idle_level = GMU_IDLE_STATE_ACTIVE;
+	/* Set GMU idle level */
+	gmu->idle_level = (adreno_gpu->info->quirks & ADRENO_QUIRK_IFPC) ?
+		GMU_IDLE_STATE_IFPC : GMU_IDLE_STATE_ACTIVE;
 
 	pm_runtime_enable(gmu->dev);
 
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
index 8e69b1e8465711837151725c8f70e7b4b16a368e..550de6ad68effacaea09751891c2528464bdfcc5 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_hfi.c
@@ -21,6 +21,7 @@ static const char * const a6xx_hfi_msg_id[] = {
 	HFI_MSG_ID(HFI_H2F_MSG_PERF_TABLE),
 	HFI_MSG_ID(HFI_H2F_MSG_TEST),
 	HFI_MSG_ID(HFI_H2F_MSG_START),
+	HFI_MSG_ID(HFI_H2F_FEATURE_CTRL),
 	HFI_MSG_ID(HFI_H2F_MSG_CORE_FW_START),
 	HFI_MSG_ID(HFI_H2F_MSG_GX_BW_PERF_VOTE),
 	HFI_MSG_ID(HFI_H2F_MSG_PREPARE_SLUMBER),
@@ -765,23 +766,40 @@ static int a6xx_hfi_send_bw_table(struct a6xx_gmu *gmu)
 		NULL, 0);
 }
 
+static int a6xx_hfi_feature_ctrl_msg(struct a6xx_gmu *gmu, u32 feature, u32 enable, u32 data)
+{
+	struct a6xx_hfi_msg_feature_ctrl msg = {
+		.feature = feature,
+		.enable = enable,
+		.data = data,
+	};
+
+	return a6xx_hfi_send_msg(gmu, HFI_H2F_FEATURE_CTRL, &msg, sizeof(msg), NULL, 0);
+}
+
+#define HFI_FEATURE_IFPC 9
+#define IFPC_LONG_HYST 0x1680
+
+static int a6xx_hfi_enable_ifpc(struct a6xx_gmu *gmu)
+{
+	if (gmu->idle_level != GMU_IDLE_STATE_IFPC)
+		return 0;
+
+	return a6xx_hfi_feature_ctrl_msg(gmu, HFI_FEATURE_IFPC, 1, IFPC_LONG_HYST);
+}
+
 #define HFI_FEATURE_ACD 12
 
 static int a6xx_hfi_enable_acd(struct a6xx_gmu *gmu)
 {
 	struct a6xx_hfi_acd_table *acd_table = &gmu->acd_table;
-	struct a6xx_hfi_msg_feature_ctrl msg = {
-		.feature = HFI_FEATURE_ACD,
-		.enable = 1,
-		.data = 0,
-	};
 	int ret;
 
 	if (!acd_table->enable_by_level)
 		return 0;
 
 	/* Enable ACD feature at GMU */
-	ret = a6xx_hfi_send_msg(gmu, HFI_H2F_FEATURE_CTRL, &msg, sizeof(msg), NULL, 0);
+	ret = a6xx_hfi_feature_ctrl_msg(gmu, HFI_FEATURE_ACD, 1, 0);
 	if (ret) {
 		DRM_DEV_ERROR(gmu->dev, "Unable to enable ACD (%d)\n", ret);
 		return ret;
@@ -898,6 +916,10 @@ int a6xx_hfi_start(struct a6xx_gmu *gmu, int boot_state)
 	if (ret)
 		return ret;
 
+	ret = a6xx_hfi_enable_ifpc(gmu);
+	if (ret)
+		return ret;
+
 	ret = a6xx_hfi_send_core_fw_start(gmu);
 	if (ret)
 		return ret;
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 9dc93c247196d5b8b3659157f7aeea81809d4056..390fa6720d9b096f4fa7d1639645d453d43b153a 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -59,6 +59,7 @@ enum adreno_family {
 #define ADRENO_QUIRK_HAS_CACHED_COHERENT	BIT(4)
 #define ADRENO_QUIRK_PREEMPTION			BIT(5)
 #define ADRENO_QUIRK_4GB_VA			BIT(6)
+#define ADRENO_QUIRK_IFPC			BIT(7)
 
 /* Helper for formating the chip_id in the way that userspace tools like
  * crashdec expect.

-- 
2.50.1