Tegra194: restore XUSB stream IDs on System Resume
The stream IDs for XUSB programmed during cold boot are lost on System
Suspend. This patch restores the XUSB stream IDs on System Resume.
NOTE: THE WARMBOOT CODE NEEDS TO MAKE SURE THAT THE XUSB MODULE IS OUT
OF RESET AND THE CLOCKS ARE ENABLED, BEFORE POWERING ON THE CPU, DURING
SYSTEM RESUME.
Change-Id: Ibd5f1e5ebacffa6b29b625f4c41ecf204afa8191
Signed-off-by: Varun Wadekar <vwadekar@nvidia.com>
diff --git a/plat/nvidia/tegra/soc/t194/plat_setup.c b/plat/nvidia/tegra/soc/t194/plat_setup.c
index 8c57105..7dde9dd 100644
--- a/plat/nvidia/tegra/soc/t194/plat_setup.c
+++ b/plat/nvidia/tegra/soc/t194/plat_setup.c
@@ -1,5 +1,5 @@
/*
- * Copyright (c) 2019, NVIDIA CORPORATION. All rights reserved.
+ * Copyright (c) 2019-2020, NVIDIA CORPORATION. All rights reserved.
*
* SPDX-License-Identifier: BSD-3-Clause
*/
@@ -197,12 +197,13 @@
******************************************************************************/
void plat_early_platform_setup(void)
{
-
/* sanity check MCE firmware compatibility */
mce_verify_firmware_version();
- /* Program XUSB STREAMIDs
- * Xavier XUSB has support for XUSB virtualization. It will have one
+ /*
+ * Program XUSB STREAMIDs
+ * ======================
+ * T19x XUSB has support for XUSB virtualization. It will have one
* physical function (PF) and four Virtual function (VF)
*
* There were below two SIDs for XUSB until T186.
@@ -227,14 +228,8 @@
* f) #define XUSB_PADCTL_HOST_AXI_STREAMID_VF_3 (0x137cU)
*
* This change disables SID override and programs XUSB SIDs in
- * above registers to support both virtualization and non-virtualization
- *
- * Known Limitations:
- * If xusb interface disables SMMU in XUSB DT in non-virtualization
- * setup then there will be SMMU fault. We need to use WAR at
- * https:\\git-master.nvidia.com/r/1529227/ to the issue.
- *
- * More details can be found in the bug 1971161
+ * above registers to support both virtualization and
+ * non-virtualization platforms
*/
mmio_write_32(TEGRA_XUSB_PADCTL_BASE +
XUSB_PADCTL_HOST_AXI_STREAMID_PF_0, TEGRA_SID_XUSB_HOST);