Received-SPF: pass (google.com: domain of linux-kernel+bounces-203157-linux.lists.archive=gmail.com@vger.kernel.org designates 139.178.88.99 as permitted sender) client-ip=139.178.88.99;
From: Konrad Dybcio <konrad.dybcio@linaro.org>
Date: Wed, 05 Jun 2024 22:10:19 +0200
Subject: [PATCH v2 6/7] drm/msm/adreno: Redo the speedbin assignment
Precedence: bulk
MIME-Version: 1.0
Content-Type: text/plain; charset="utf-8"
Content-Transfer-Encoding: 7bit
Message-Id: <20240605-topic-smem_speedbin-v2-6-8989d7e3d176@linaro.org>
References: <20240605-topic-smem_speedbin-v2-0-8989d7e3d176@linaro.org>
In-Reply-To: <20240605-topic-smem_speedbin-v2-0-8989d7e3d176@linaro.org>
To: Bjorn Andersson <andersson@kernel.org>, Rob Clark <robdclark@gmail.com>, 
 Abhinav Kumar <quic_abhinavk@quicinc.com>, 
 Dmitry Baryshkov <dmitry.baryshkov@linaro.org>, Sean Paul <sean@poorly.run>, 
 Marijn Suijten <marijn.suijten@somainline.org>, 
 David Airlie <airlied@gmail.com>, Daniel Vetter <daniel@ffwll.ch>, 
 Rob Herring <robh@kernel.org>, Krzysztof Kozlowski <krzk+dt@kernel.org>, 
 Conor Dooley <conor+dt@kernel.org>
Cc: linux-arm-msm@vger.kernel.org, linux-kernel@vger.kernel.org, 
 dri-devel@lists.freedesktop.org, freedreno@lists.freedesktop.org, 
 devicetree@vger.kernel.org, Neil Armstrong <neil.armstrong@linaro.org>, 
 Konrad Dybcio <konrad.dybcio@linaro.org>

There is no need to reinvent the wheel for simple read-match-set logic.

Make speedbin discovery and assignment generation independent.

This implicitly removes the bogus 0x80 / BIT(7) speed bin on A5xx,
which has no representation in hardware whatshowever.

Signed-off-by: Konrad Dybcio <konrad.dybcio@linaro.org>
---
 drivers/gpu/drm/msm/adreno/a5xx_gpu.c   | 34 --------------------
 drivers/gpu/drm/msm/adreno/a6xx_gpu.c   | 56 ---------------------------------
 drivers/gpu/drm/msm/adreno/adreno_gpu.c | 51 ++++++++++++++++++++++++++----
 drivers/gpu/drm/msm/adreno/adreno_gpu.h |  3 --
 4 files changed, 45 insertions(+), 99 deletions(-)

diff --git a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
index c003f970189b..eed6a2eb1731 100644
--- a/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a5xx_gpu.c
@@ -1704,38 +1704,6 @@ static const struct adreno_gpu_funcs funcs = {
 	.get_timestamp = a5xx_get_timestamp,
 };
 
-static void check_speed_bin(struct device *dev)
-{
-	struct nvmem_cell *cell;
-	u32 val;
-
-	/*
-	 * If the OPP table specifies a opp-supported-hw property then we have
-	 * to set something with dev_pm_opp_set_supported_hw() or the table
-	 * doesn't get populated so pick an arbitrary value that should
-	 * ensure the default frequencies are selected but not conflict with any
-	 * actual bins
-	 */
-	val = 0x80;
-
-	cell = nvmem_cell_get(dev, "speed_bin");
-
-	if (!IS_ERR(cell)) {
-		void *buf = nvmem_cell_read(cell, NULL);
-
-		if (!IS_ERR(buf)) {
-			u8 bin = *((u8 *) buf);
-
-			val = (1 << bin);
-			kfree(buf);
-		}
-
-		nvmem_cell_put(cell);
-	}
-
-	devm_pm_opp_set_supported_hw(dev, &val, 1);
-}
-
 struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
@@ -1763,8 +1731,6 @@ struct msm_gpu *a5xx_gpu_init(struct drm_device *dev)
 
 	a5xx_gpu->lm_leakage = 0x4E001A;
 
-	check_speed_bin(&pdev->dev);
-
 	nr_rings = 4;
 
 	if (config->info->revn == 510)
diff --git a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
index 3f84417ff027..d256e27ee581 100644
--- a/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/a6xx_gpu.c
@@ -2882,55 +2882,6 @@ static bool a6xx_progress(struct msm_gpu *gpu, struct msm_ringbuffer *ring)
 	return progress;
 }
 
-static u32 fuse_to_supp_hw(const struct adreno_info *info, u32 fuse)
-{
-	if (!info->speedbins)
-		return UINT_MAX;
-
-	for (int i = 0; info->speedbins[i].fuse != SHRT_MAX; i++)
-		if (info->speedbins[i].fuse == fuse)
-			return BIT(info->speedbins[i].speedbin);
-
-	return UINT_MAX;
-}
-
-static int a6xx_set_supported_hw(struct adreno_gpu *adreno_gpu,
-				 struct device *dev,
-				 const struct adreno_info *info)
-{
-	u32 supp_hw;
-	u32 speedbin;
-	int ret;
-
-	ret = adreno_read_speedbin(adreno_gpu, dev, &speedbin);
-	/*
-	 * -ENOENT means that the platform doesn't support speedbin which is
-	 * fine
-	 */
-	if (ret == -ENOENT) {
-		return 0;
-	} else if (ret) {
-		dev_err_probe(dev, ret,
-			      "failed to read speed-bin. Some OPPs may not be supported by hardware\n");
-		return ret;
-	}
-
-	supp_hw = fuse_to_supp_hw(info, speedbin);
-
-	if (supp_hw == UINT_MAX) {
-		DRM_DEV_ERROR(dev,
-			"missing support for speed-bin: %u. Some OPPs may not be supported by hardware\n",
-			speedbin);
-		supp_hw = BIT(0); /* Default */
-	}
-
-	ret = devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
-	if (ret)
-		return ret;
-
-	return 0;
-}
-
 static const struct adreno_gpu_funcs funcs = {
 	.base = {
 		.get_param = adreno_get_param,
@@ -3062,13 +3013,6 @@ struct msm_gpu *a6xx_gpu_init(struct drm_device *dev)
 
 	a6xx_llc_slices_init(pdev, a6xx_gpu, is_a7xx);
 
-	ret = a6xx_set_supported_hw(adreno_gpu, &pdev->dev, config->info);
-	if (ret) {
-		a6xx_llc_slices_destroy(a6xx_gpu);
-		kfree(a6xx_gpu);
-		return ERR_PTR(ret);
-	}
-
 	if (is_a7xx)
 		ret = adreno_gpu_init(dev, pdev, adreno_gpu, &funcs_a7xx, 1);
 	else if (adreno_has_gmu_wrapper(adreno_gpu))
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.c b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
index 055072260b3d..8b2bc5f147e8 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.c
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.c
@@ -1060,8 +1060,8 @@ void adreno_gpu_ocmem_cleanup(struct adreno_ocmem *adreno_ocmem)
 			   adreno_ocmem->hdl);
 }
 
-int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
-			 struct device *dev, u32 *fuse)
+static int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
+			        struct device *dev, u32 *fuse)
 {
 	u32 fcode;
 	int ret;
@@ -1095,6 +1095,46 @@ int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
 	return 0;
 }
 
+#define ADRENO_SPEEDBIN_FUSE_NODATA	0xFFFF /* Made-up large value, expected by mesa */
+static int adreno_set_speedbin(struct adreno_gpu *adreno_gpu, struct device *dev)
+{
+	const struct adreno_info *info = adreno_gpu->info;
+	u32 fuse = ADRENO_SPEEDBIN_FUSE_NODATA;
+	u32 supp_hw = UINT_MAX;
+	int ret;
+
+	/* No speedbins defined for this GPU SKU => allow all defined OPPs */
+	if (!info->speedbins) {
+		adreno_gpu->speedbin = ADRENO_SPEEDBIN_FUSE_NODATA;
+		return devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
+	}
+
+	/*
+	 * If a real error (not counting older devicetrees having no nvmem references)
+	 * occurs when trying to get the fuse value, bail out.
+	 */
+	ret = adreno_read_speedbin(adreno_gpu, dev, &fuse);
+	if (ret) {
+		return ret;
+	} else if (fuse == ADRENO_SPEEDBIN_FUSE_NODATA) {
+		/* The info struct has speedbin data, but the DT is too old => allow all OPPs */
+		DRM_DEV_INFO(dev, "No GPU speed bin fuse, please update your device tree\n");
+		return devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
+	}
+
+	adreno_gpu->speedbin = fuse;
+
+	/* Traverse the known speedbins */
+	for (int i = 0; info->speedbins[i].fuse != SHRT_MAX; i++) {
+		if (info->speedbins[i].fuse == fuse) {
+			supp_hw = BIT(info->speedbins[i].speedbin);
+			return devm_pm_opp_set_supported_hw(dev, &supp_hw, 1);
+		}
+	}
+
+	return dev_err_probe(dev, -EINVAL, "Unknown speed bin fuse value: 0x%x\n", fuse);
+}
+
 int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 		struct adreno_gpu *adreno_gpu,
 		const struct adreno_gpu_funcs *funcs, int nr_rings)
@@ -1104,7 +1144,6 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	struct msm_gpu_config adreno_gpu_config  = { 0 };
 	struct msm_gpu *gpu = &adreno_gpu->base;
 	const char *gpu_name;
-	u32 speedbin;
 	int ret;
 
 	adreno_gpu->funcs = funcs;
@@ -1131,9 +1170,9 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 			devm_pm_opp_set_clkname(dev, "core");
 	}
 
-	if (adreno_read_speedbin(adreno_gpu, dev, &speedbin) || !speedbin)
-		speedbin = 0xffff;
-	adreno_gpu->speedbin = speedbin;
+	ret = adreno_set_speedbin(adreno_gpu, dev);
+	if (ret)
+		return ret;
 
 	gpu_name = devm_kasprintf(dev, GFP_KERNEL, "%"ADRENO_CHIPID_FMT,
 			ADRENO_CHIPID_ARGS(config->chip_id));
diff --git a/drivers/gpu/drm/msm/adreno/adreno_gpu.h b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
index 8f2b70eaf6ad..30e8b9919adb 100644
--- a/drivers/gpu/drm/msm/adreno/adreno_gpu.h
+++ b/drivers/gpu/drm/msm/adreno/adreno_gpu.h
@@ -524,9 +524,6 @@ int adreno_fault_handler(struct msm_gpu *gpu, unsigned long iova, int flags,
 			 struct adreno_smmu_fault_info *info, const char *block,
 			 u32 scratch[4]);
 
-int adreno_read_speedbin(struct adreno_gpu *adreno_gpu,
-			 struct device *dev, u32 *speedbin);
-
 /*
  * For a5xx and a6xx targets load the zap shader that is used to pull the GPU
  * out of secure mode

-- 
2.43.0