gpu: host1x: Use tegra_dev_iommu_get_stream_id()

Use the newly implemented tegra_dev_iommu_get_stream_id() helper to
encapsulate and centralize the IOMMU stream ID access.

Signed-off-by: Thierry Reding <treding@nvidia.com>

drivers/gpu/host1x/context.c

@@ -35,8 +35,6 @@ int host1x_memory_context_list_init(struct host1x *host1x)
 	cdl->len = err / 4;
 
 	for (i = 0; i < cdl->len; i++) {
-		struct iommu_fwspec *fwspec;
-
 		ctx = &cdl->devs[i];
 
 		ctx->host = host1x;
@@ -70,14 +68,12 @@ int host1x_memory_context_list_init(struct host1x *host1x)
 			goto del_devices;
 		}
 
-		fwspec = dev_iommu_fwspec_get(&ctx->dev);
-		if (!fwspec || !device_iommu_mapped(&ctx->dev)) {
+		if (!tegra_dev_iommu_get_stream_id(&ctx->dev, &ctx->stream_id) ||
+		    !device_iommu_mapped(&ctx->dev)) {
 			dev_err(host1x->dev, "Context device %d has no IOMMU!\n", i);
 			device_del(&ctx->dev);
 			goto del_devices;
 		}
-
-		ctx->stream_id = fwspec->ids[0] & 0xffff;
 	}
 
 	return 0;

drivers/gpu/host1x/hw/channel_hw.c

@@ -179,14 +179,12 @@ static inline void synchronize_syncpt_base(struct host1x_job *job)
 static void host1x_channel_set_streamid(struct host1x_channel *channel)
 {
 #if HOST1X_HW >= 6
-	u32 sid = 0x7f;
-#ifdef CONFIG_IOMMU_API
-	struct iommu_fwspec *spec = dev_iommu_fwspec_get(channel->dev->parent);
-	if (spec)
-		sid = spec->ids[0] & 0xffff;
-#endif
+	u32 stream_id;
+
+	if (!tegra_dev_iommu_get_stream_id(channel->dev->parent, &stream_id))
+		stream_id = TEGRA_STREAM_ID_BYPASS;
 
-	host1x_ch_writel(channel, sid, HOST1X_CHANNEL_SMMU_STREAMID);
+	host1x_ch_writel(channel, stream_id, HOST1X_CHANNEL_SMMU_STREAMID);
 #endif
 }