[PATCH V3 2/3] usb: host: xhci-tegra: Skip MBOX MSG_ENABLED on Tegra264

[Wayne Chang <waynec@nvidia.com>]

Tegra264 XUSB does not use the firmware mailbox handshake to enable
controller messages (MBOX_CMD_MSG_ENABLED). Add a per-SoC flag and
short-circuit __tegra_xusb_enable_firmware_messages() so both probe
and resume avoid sending the command.

Signed-off-by: Wayne Chang <waynec@nvidia.com>
---
V2 -> V3: No change
V1 -> V2: No change
 drivers/usb/host/xhci-tegra.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/usb/host/xhci-tegra.c b/drivers/usb/host/xhci-tegra.c
index e7e6d569f1db..7d56f35ec9e7 100644
--- a/drivers/usb/host/xhci-tegra.c
+++ b/drivers/usb/host/xhci-tegra.c
@@ -250,6 +250,7 @@ struct tegra_xusb_soc {
 	bool otg_set_port_power;
 
 	bool has_bar2;
+	bool enable_firmware_messages;
 };
 
 struct tegra_xusb_context {
@@ -1260,6 +1261,9 @@ static int __tegra_xusb_enable_firmware_messages(struct tegra_xusb *tegra)
 	struct tegra_xusb_mbox_msg msg;
 	int err;
 
+	if (!tegra->soc->enable_firmware_messages)
+		return 0;
+
 	/* Enable firmware messages from controller. */
 	msg.cmd = MBOX_CMD_MSG_ENABLED;
 	msg.data = 0;
@@ -2580,6 +2584,7 @@ static const struct tegra_xusb_soc tegra124_soc = {
 		.owner = 0xf0,
 		.smi_intr = XUSB_CFG_ARU_SMI_INTR,
 	},
+	.enable_firmware_messages = true,
 };
 #if IS_ENABLED(CONFIG_ARCH_TEGRA_124_SOC) || IS_ENABLED(CONFIG_ARCH_TEGRA_132_SOC)
 MODULE_FIRMWARE("nvidia/tegra124/xusb.bin");
@@ -2621,6 +2626,7 @@ static const struct tegra_xusb_soc tegra210_soc = {
 		.owner = 0xf0,
 		.smi_intr = XUSB_CFG_ARU_SMI_INTR,
 	},
+	.enable_firmware_messages = true,
 };
 #if IS_ENABLED(CONFIG_ARCH_TEGRA_210_SOC)
 MODULE_FIRMWARE("nvidia/tegra210/xusb.bin");
@@ -2670,6 +2676,7 @@ static const struct tegra_xusb_soc tegra186_soc = {
 		.smi_intr = XUSB_CFG_ARU_SMI_INTR,
 	},
 	.lpm_support = true,
+	.enable_firmware_messages = true,
 };
 
 static const char * const tegra194_supply_names[] = {
@@ -2704,6 +2711,7 @@ static const struct tegra_xusb_soc tegra194_soc = {
 		.smi_intr = XUSB_CFG_ARU_SMI_INTR,
 	},
 	.lpm_support = true,
+	.enable_firmware_messages = true,
 };
 #if IS_ENABLED(CONFIG_ARCH_TEGRA_194_SOC)
 MODULE_FIRMWARE("nvidia/tegra194/xusb.bin");
@@ -2741,6 +2749,7 @@ static const struct tegra_xusb_soc tegra234_soc = {
 	},
 	.lpm_support = true,
 	.has_bar2 = true,
+	.enable_firmware_messages = true,
 };
 
 static const struct of_device_id tegra_xusb_of_match[] = {
-- 
2.25.1