drm/msm/mdp5: move iommu_domain_alloc() call close to its usage

Move iommu_domain_alloc() in front of adress space/IOMMU initialization.
This allows us to drop final bits of struct mdp5_cfg_platform which
remained from the pre-DT days.
Reviewed-by: Abhinav Kumar <quic_abhinavk@quicinc.com>
Signed-off-by: Dmitry Baryshkov <dmitry.baryshkov@linaro.org>
Patchwork: https://patchwork.freedesktop.org/patch/489695/
Link: https://lore.kernel.org/r/20220616081106.350262-3-dmitry.baryshkov@linaro.orgSigned-off-by: Rob Clark <robdclark@chromium.org>

drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.c

@@ -1253,8 +1253,6 @@ static const struct mdp5_cfg_handler cfg_handlers_v3[] = {
 	{ .revision = 3, .config = { .hw = &sdm630_config } },
 };
 
-static struct mdp5_cfg_platform *mdp5_get_config(struct platform_device *dev);
-
 const struct mdp5_cfg_hw *mdp5_cfg_get_hw_config(struct mdp5_cfg_handler *cfg_handler)
 {
 	return cfg_handler->config.hw;
@@ -1279,10 +1277,8 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 		uint32_t major, uint32_t minor)
 {
 	struct drm_device *dev = mdp5_kms->dev;
-	struct platform_device *pdev = to_platform_device(dev->dev);
 	struct mdp5_cfg_handler *cfg_handler;
 	const struct mdp5_cfg_handler *cfg_handlers;
-	struct mdp5_cfg_platform *pconfig;
 	int i, ret = 0, num_handlers;
 
 	cfg_handler = kzalloc(sizeof(*cfg_handler), GFP_KERNEL);
@@ -1325,9 +1321,6 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 	cfg_handler->revision = minor;
 	cfg_handler->config.hw = mdp5_cfg;
 
-	pconfig = mdp5_get_config(pdev);
-	memcpy(&cfg_handler->config.platform, pconfig, sizeof(*pconfig));
-
 	DBG("MDP5: %s hw config selected", mdp5_cfg->name);
 
 	return cfg_handler;
@@ -1338,12 +1331,3 @@ struct mdp5_cfg_handler *mdp5_cfg_init(struct mdp5_kms *mdp5_kms,
 
 	return ERR_PTR(ret);
 }
-
-static struct mdp5_cfg_platform *mdp5_get_config(struct platform_device *dev)
-{
-	static struct mdp5_cfg_platform config = {};
-
-	config.iommu = iommu_domain_alloc(&platform_bus_type);
-
-	return &config;
-}

drivers/gpu/drm/msm/disp/mdp5/mdp5_cfg.h

@@ -104,14 +104,8 @@ struct mdp5_cfg_hw {
 	uint32_t max_clk;
 };
 
-/* platform config data (ie. from DT, or pdata) */
-struct mdp5_cfg_platform {
-	struct iommu_domain *iommu;
-};
-
 struct mdp5_cfg {
 	const struct mdp5_cfg_hw *hw;
-	struct mdp5_cfg_platform platform;
 };
 
 struct mdp5_kms;

drivers/gpu/drm/msm/disp/mdp5/mdp5_kms.c

@@ -558,6 +558,7 @@ static int mdp5_kms_init(struct drm_device *dev)
 	struct msm_gem_address_space *aspace;
 	int irq, i, ret;
 	struct device *iommu_dev;
+	struct iommu_domain *iommu;
 
 	ret = mdp5_init(to_platform_device(dev->dev), dev);
 
@@ -601,14 +602,15 @@ static int mdp5_kms_init(struct drm_device *dev)
 	}
 	mdelay(16);
 
-	if (config->platform.iommu) {
+	iommu = iommu_domain_alloc(&platform_bus_type);
+	if (iommu) {
 		struct msm_mmu *mmu;
 
 		iommu_dev = &pdev->dev;
 		if (!dev_iommu_fwspec_get(iommu_dev))
 			iommu_dev = iommu_dev->parent;
 
-		mmu = msm_iommu_new(iommu_dev, config->platform.iommu);
+		mmu = msm_iommu_new(iommu_dev, iommu);
 
 		aspace = msm_gem_address_space_create(mmu, "mdp5",
 			0x1000, 0x100000000 - 0x1000);