drm/msm/adreno: load gpu at probe/bind time

Previously, in an effort to defer initializing the gpu until firmware
was available (ie. rootfs mounted), the gpu was not loaded at when the
subdevice was bound.  Which resulted that clks/etc were requested in a
place that devm couldn't really help unwind if something failed.

Instead move request_firmware() to gpu->hw_init() and construct the gpu
earlier in adreno_bind().  To avoid the rest of the driver needing to
be aware of a gpu that hasn't managed to load firmware and hw_init()
yet, stash the gpu ptr in the adreno device's drvdata, and don't set
priv->gpu() until hw_init() succeeds.
Signed-off-by: Rob Clark <robdclark@gmail.com>

drivers/gpu/drm/msm/adreno/a5xx_gpu.c

@@ -536,13 +536,12 @@ static int a5xx_hw_init(struct msm_gpu *gpu)
 		REG_A5XX_RBBM_SECVID_TSB_TRUSTED_BASE_HI, 0x00000000);
 	gpu_write(gpu, REG_A5XX_RBBM_SECVID_TSB_TRUSTED_SIZE, 0x00000000);
 
-	/* Load the GPMU firmware before starting the HW init */
-	a5xx_gpmu_ucode_init(gpu);
-
 	ret = adreno_hw_init(gpu);
 	if (ret)
 		return ret;
 
+	a5xx_gpmu_ucode_init(gpu);
+
 	ret = a5xx_ucode_init(gpu);
 	if (ret)
 		return ret;

drivers/gpu/drm/msm/adreno/adreno_device.c

@@ -125,39 +125,14 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 {
 	struct msm_drm_private *priv = dev->dev_private;
 	struct platform_device *pdev = priv->gpu_pdev;
-	struct adreno_platform_config *config;
-	struct adreno_rev rev;
-	const struct adreno_info *info;
-	struct msm_gpu *gpu = NULL;
+	struct msm_gpu *gpu = platform_get_drvdata(priv->gpu_pdev);
+	int ret;
 
-	if (!pdev) {
+	if (!gpu) {
 		dev_err(dev->dev, "no adreno device\n");
 		return NULL;
 	}
 
-	config = pdev->dev.platform_data;
-	rev = config->rev;
-	info = adreno_info(config->rev);
-
-	if (!info) {
-		dev_warn(dev->dev, "Unknown GPU revision: %u.%u.%u.%u\n",
-				rev.core, rev.major, rev.minor, rev.patchid);
-		return NULL;
-	}
-
-	DBG("Found GPU: %u.%u.%u.%u",  rev.core, rev.major,
-			rev.minor, rev.patchid);
-
-	gpu = info->init(dev);
-	if (IS_ERR(gpu)) {
-		dev_warn(dev->dev, "failed to load adreno gpu\n");
-		gpu = NULL;
-		/* not fatal */
-	}
-
-	if (gpu) {
-		int ret;
-
 	pm_runtime_get_sync(&pdev->dev);
 	mutex_lock(&dev->struct_mutex);
 	ret = msm_gpu_hw_init(gpu);
@@ -165,9 +140,7 @@ struct msm_gpu *adreno_load_gpu(struct drm_device *dev)
 	pm_runtime_put_sync(&pdev->dev);
 	if (ret) {
 		dev_err(dev->dev, "gpu hw init failed: %d\n", ret);
-			gpu->funcs->destroy(gpu);
-			gpu = NULL;
-		}
+		return NULL;
 	}
 
 	return gpu;
@@ -282,6 +255,9 @@ static int adreno_get_pwrlevels(struct device *dev,
 static int adreno_bind(struct device *dev, struct device *master, void *data)
 {
 	static struct adreno_platform_config config = {};
+	const struct adreno_info *info;
+	struct drm_device *drm = dev_get_drvdata(master);
+	struct msm_gpu *gpu;
 	u32 val;
 	int ret;
 
@@ -302,13 +278,39 @@ static int adreno_bind(struct device *dev, struct device *master, void *data)
 		return ret;
 
 	dev->platform_data = &config;
-	set_gpu_pdev(dev_get_drvdata(master), to_platform_device(dev));
+	set_gpu_pdev(drm, to_platform_device(dev));
+
+	info = adreno_info(config.rev);
+
+	if (!info) {
+		dev_warn(drm->dev, "Unknown GPU revision: %u.%u.%u.%u\n",
+			config.rev.core, config.rev.major,
+			config.rev.minor, config.rev.patchid);
+		return -ENXIO;
+	}
+
+	DBG("Found GPU: %u.%u.%u.%u", config.rev.core, config.rev.major,
+		config.rev.minor, config.rev.patchid);
+
+	gpu = info->init(drm);
+	if (IS_ERR(gpu)) {
+		dev_warn(drm->dev, "failed to load adreno gpu\n");
+		return PTR_ERR(gpu);
+	}
+
+	dev_set_drvdata(dev, gpu);
+
 	return 0;
 }
 
 static void adreno_unbind(struct device *dev, struct device *master,
 		void *data)
 {
+	struct msm_gpu *gpu = dev_get_drvdata(dev);
+
+	gpu->funcs->pm_suspend(gpu);
+	gpu->funcs->destroy(gpu);
+
 	set_gpu_pdev(dev_get_drvdata(master), NULL);
 }
 

drivers/gpu/drm/msm/adreno/adreno_gpu.c

@@ -64,6 +64,33 @@ int adreno_get_param(struct msm_gpu *gpu, uint32_t param, uint64_t *value)
 	}
 }
 
+static int adreno_load_fw(struct adreno_gpu *adreno_gpu)
+{
+	struct drm_device *drm = adreno_gpu->base.dev;
+	int ret;
+
+	if (adreno_gpu->pm4)
+		return 0;
+
+	ret = request_firmware(&adreno_gpu->pm4, adreno_gpu->info->pm4fw, drm->dev);
+	if (ret) {
+		dev_err(drm->dev, "failed to load %s PM4 firmware: %d\n",
+				adreno_gpu->info->pm4fw, ret);
+		return ret;
+	}
+
+	ret = request_firmware(&adreno_gpu->pfp, adreno_gpu->info->pfpfw, drm->dev);
+	if (ret) {
+		dev_err(drm->dev, "failed to load %s PFP firmware: %d\n",
+				adreno_gpu->info->pfpfw, ret);
+		release_firmware(adreno_gpu->pm4);
+		adreno_gpu->pm4 = NULL;
+		return ret;
+	}
+
+	return 0;
+}
+
 int adreno_hw_init(struct msm_gpu *gpu)
 {
 	struct adreno_gpu *adreno_gpu = to_adreno_gpu(gpu);
@@ -71,6 +98,10 @@ int adreno_hw_init(struct msm_gpu *gpu)
 
 	DBG("%s", gpu->name);
 
+	ret = adreno_load_fw(adreno_gpu);
+	if (ret)
+		return ret;
+
 	ret = msm_gem_get_iova(gpu->rb->bo, gpu->aspace, &gpu->rb_iova);
 	if (ret) {
 		gpu->rb_iova = 0;
@@ -377,20 +408,6 @@ int adreno_gpu_init(struct drm_device *drm, struct platform_device *pdev,
 	if (ret)
 		return ret;
 
-	ret = request_firmware(&adreno_gpu->pm4, adreno_gpu->info->pm4fw, drm->dev);
-	if (ret) {
-		dev_err(drm->dev, "failed to load %s PM4 firmware: %d\n",
-				adreno_gpu->info->pm4fw, ret);
-		return ret;
-	}
-
-	ret = request_firmware(&adreno_gpu->pfp, adreno_gpu->info->pfpfw, drm->dev);
-	if (ret) {
-		dev_err(drm->dev, "failed to load %s PFP firmware: %d\n",
-				adreno_gpu->info->pfpfw, ret);
-		return ret;
-	}
-
 	adreno_gpu->memptrs = msm_gem_kernel_new(drm,
 		sizeof(*adreno_gpu->memptrs), MSM_BO_UNCACHED, gpu->aspace,
 		&adreno_gpu->memptrs_bo, &adreno_gpu->memptrs_iova);

drivers/gpu/drm/msm/msm_drv.c

@@ -211,7 +211,6 @@ static int msm_drm_uninit(struct device *dev)
 	struct drm_device *ddev = platform_get_drvdata(pdev);
 	struct msm_drm_private *priv = ddev->dev_private;
 	struct msm_kms *kms = priv->kms;
-	struct msm_gpu *gpu = priv->gpu;
 	struct msm_vblank_ctrl *vbl_ctrl = &priv->vblank_ctrl;
 	struct vblank_event *vbl_ev, *tmp;
 
@@ -253,15 +252,6 @@ static int msm_drm_uninit(struct device *dev)
 	if (kms && kms->funcs)
 		kms->funcs->destroy(kms);
 
-	if (gpu) {
-		mutex_lock(&ddev->struct_mutex);
-		// XXX what do we do here?
-		//pm_runtime_enable(&pdev->dev);
-		gpu->funcs->pm_suspend(gpu);
-		mutex_unlock(&ddev->struct_mutex);
-		gpu->funcs->destroy(gpu);
-	}
-
 	if (priv->vram.paddr) {
 		unsigned long attrs = DMA_ATTR_NO_KERNEL_MAPPING;
 		drm_mm_takedown(&priv->vram.mm);