From 16aca0c3f55b555a9a236180391e3acc3ef389a5 Mon Sep 17 00:00:00 2001
From: Eliot Lee <eliot.lee@intel.corp-partner.google.com>
Date: Tue, 28 Feb 2023 19:57:41 -0800
Subject: [PATCH] CHROMIUM: net: wwan: t7xx: Compat for MR2 software

Newly enabled info_get ops might not be supported by old modem firmwares.
To support older firmwares, the change loopbacks the request to bypass
the version checks.
This is a WA till google supports MR3 firmware officially.

UPSTREAM-TASK=b:278932830
BUG=b:258509032
TEST=Manual connectivity/traffic tests on Brya

Signed-off-by: Eliot Lee <eliot.lee@intel.corp-partner.google.com>
Signed-off-by: Dinesh Kumar Sharma <dinesh.sharma@intel.corp-partner.google.com>

Change-Id: I2fc95f7236c8145abe20b535a2ff980974959751
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/third_party/kernel/+/4369885
Commit-Queue: Daniel Winkler <danielwinkler@google.com>
Tested-by: Dinesh Sharma <dinesh.sharma@intel.corp-partner.google.com>
Reviewed-by: Madhav <madhavadas@google.com>
---
 drivers/net/wwan/t7xx/t7xx_port_devlink.c | 30 ++++++++++++++++++++++-
 1 file changed, 29 insertions(+), 1 deletion(-)

diff --git a/drivers/net/wwan/t7xx/t7xx_port_devlink.c b/drivers/net/wwan/t7xx/t7xx_port_devlink.c
index 71256c6f68819e316a3cc65a3509c75e4f08e2a1..8de2ee65fe0cb94bf6dfb476e767ccf831882d92 100644
--- a/drivers/net/wwan/t7xx/t7xx_port_devlink.c
+++ b/drivers/net/wwan/t7xx/t7xx_port_devlink.c
@@ -502,13 +502,41 @@ static int t7xx_devlink_info_get(struct devlink *devlink, struct devlink_info_re
 	return ret;
 }
 
+struct devlink_info_req {
+	struct sk_buff *msg;
+	void (*version_cb)(const char *version_name,
+			   enum devlink_info_version_type version_type,
+			   void *version_cb_priv);
+	void *version_cb_priv;
+};
+
+struct devlink_flash_component_lookup_ctx {
+	const char *lookup_name;
+	bool lookup_name_found;
+};
+
+static int t7xx_devlink_info_get_loopback(struct devlink *devlink, struct devlink_info_req *req,
+					  struct netlink_ext_ack *extack)
+{
+	struct devlink_flash_component_lookup_ctx *lookup_ctx = req->version_cb_priv;
+	int ret;
+
+	if (!req)
+		return t7xx_devlink_info_get(devlink, req, extack);
+
+	ret = devlink_info_version_running_put_ext(req, lookup_ctx->lookup_name,
+						   "1.0", DEVLINK_INFO_VERSION_TYPE_COMPONENT);
+
+	return ret;
+}
+
 /* Call back function for devlink ops */
 static const struct devlink_ops devlink_flash_ops = {
 	.supported_flash_update_params = DEVLINK_SUPPORT_FLASH_UPDATE_OVERWRITE_MASK,
 	.flash_update = t7xx_devlink_flash_update,
 	.reload_actions = BIT(DEVLINK_RELOAD_ACTION_DRIVER_REINIT) |
 			  BIT(DEVLINK_RELOAD_ACTION_FW_ACTIVATE),
-	.info_get = t7xx_devlink_info_get,
+	.info_get = t7xx_devlink_info_get_loopback,
 	.reload_down = t7xx_devlink_reload_down,
 	.reload_up = t7xx_devlink_reload_up,
 };
-- 
2.46.0.792.g87dc391469-goog