drm/tegra: vic: 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/drm/tegra/vic.c

@@ -56,41 +56,30 @@ static void vic_writel(struct vic *vic, u32 value, unsigned int offset)
 
 static int vic_boot(struct vic *vic)
 {
-#ifdef CONFIG_IOMMU_API
-	struct iommu_fwspec *spec = dev_iommu_fwspec_get(vic->dev);
-#endif
-	u32 fce_ucode_size, fce_bin_data_offset;
+	u32 fce_ucode_size, fce_bin_data_offset, stream_id;
 	void *hdr;
 	int err = 0;
 
-#ifdef CONFIG_IOMMU_API
-	if (vic->config->supports_sid && spec) {
+	if (vic->config->supports_sid && tegra_dev_iommu_get_stream_id(vic->dev, &stream_id)) {
 		u32 value;
 
 		value = TRANSCFG_ATT(1, TRANSCFG_SID_FALCON) |
 			TRANSCFG_ATT(0, TRANSCFG_SID_HW);
 		vic_writel(vic, value, VIC_TFBIF_TRANSCFG);
 
-		if (spec->num_ids > 0) {
-			value = spec->ids[0] & 0xffff;
-
-			/*
-			 * STREAMID0 is used for input/output buffers.
-			 * Initialize it to SID_VIC in case context isolation
-			 * is not enabled, and SID_VIC is used for both firmware
-			 * and data buffers.
-			 *
-			 * If context isolation is enabled, it will be
-			 * overridden by the SETSTREAMID opcode as part of
-			 * each job.
-			 */
-			vic_writel(vic, value, VIC_THI_STREAMID0);
-
-			/* STREAMID1 is used for firmware loading. */
-			vic_writel(vic, value, VIC_THI_STREAMID1);
-		}
+		/*
+		 * STREAMID0 is used for input/output buffers. Initialize it to SID_VIC in case
+		 * context isolation is not enabled, and SID_VIC is used for both firmware and
+		 * data buffers.
+		 *
+		 * If context isolation is enabled, it will be overridden by the SETSTREAMID
+		 * opcode as part of each job.
+		 */
+		vic_writel(vic, stream_id, VIC_THI_STREAMID0);
+
+		/* STREAMID1 is used for firmware loading. */
+		vic_writel(vic, stream_id, VIC_THI_STREAMID1);
 	}
-#endif
 
 	/* setup clockgating registers */
 	vic_writel(vic, CG_IDLE_CG_DLY_CNT(4) |