Patch "wifi: rtw88: rtw8821c: Fix rfe_option field width" has been added to the 6.2-stable tree

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This is a note to let you know that I've just added the patch titled

    wifi: rtw88: rtw8821c: Fix rfe_option field width

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     wifi-rtw88-rtw8821c-fix-rfe_option-field-width.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From 14705f969d98187a1cc2682e0c9bd2e230b8098f Mon Sep 17 00:00:00 2001
From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Date: Mon, 17 Apr 2023 16:03:56 +0200
Subject: wifi: rtw88: rtw8821c: Fix rfe_option field width

From: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>

commit 14705f969d98187a1cc2682e0c9bd2e230b8098f upstream.

On my RTW8821CU chipset rfe_option reads as 0x22. Looking at the
vendor driver suggests that the field width of rfe_option is 5 bit,
so rfe_option should be masked with 0x1f.

Without this the rfe_option comparisons with 2 further down the
driver evaluate as false when they should really evaluate as true.
The effect is that 2G channels do not work.

rfe_option is also used as an array index into rtw8821c_rfe_defs[].
rtw8821c_rfe_defs[34] (0x22) was added as part of adding USB support,
likely because rfe_option reads as 0x22. As this now becomes 0x2,
rtw8821c_rfe_defs[34] is no longer used and can be removed.

Note that this might not be the whole truth. In the vendor driver
there are indeed places where the unmasked rfe_option value is used.
However, the driver has several places where rfe_option is tested
with the pattern if (rfe_option == 2 || rfe_option == 0x22) or
if (rfe_option == 4 || rfe_option == 0x24), so that rfe_option BIT(5)
has no influence on the code path taken. We therefore mask BIT(5)
out from rfe_option entirely until this assumption is proved wrong
by some chip variant we do not know yet.

Signed-off-by: Sascha Hauer <s.hauer@xxxxxxxxxxxxxx>
Tested-by: Alexandru gagniuc <mr.nuke.me@xxxxxxxxx>
Tested-by: Larry Finger <Larry.Finger@xxxxxxxxxxxx>
Tested-by: ValdikSS <iam@xxxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxxxxxxx
Reviewed-by: Ping-Ke Shih <pkshih@xxxxxxxxxxx>
Signed-off-by: Kalle Valo <kvalo@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20230417140358.2240429-3-s.hauer@xxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/net/wireless/realtek/rtw88/rtw8821c.c |    3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

--- a/drivers/net/wireless/realtek/rtw88/rtw8821c.c
+++ b/drivers/net/wireless/realtek/rtw88/rtw8821c.c
@@ -47,7 +47,7 @@ static int rtw8821c_read_efuse(struct rt
 
 	map = (struct rtw8821c_efuse *)log_map;
 
-	efuse->rfe_option = map->rfe_option;
+	efuse->rfe_option = map->rfe_option & 0x1f;
 	efuse->rf_board_option = map->rf_board_option;
 	efuse->crystal_cap = map->xtal_k;
 	efuse->pa_type_2g = map->pa_type;
@@ -1537,7 +1537,6 @@ static const struct rtw_rfe_def rtw8821c
 	[2] = RTW_DEF_RFE_EXT(8821c, 0, 0, 2),
 	[4] = RTW_DEF_RFE_EXT(8821c, 0, 0, 2),
 	[6] = RTW_DEF_RFE(8821c, 0, 0),
-	[34] = RTW_DEF_RFE(8821c, 0, 0),
 };
 
 static struct rtw_hw_reg rtw8821c_dig[] = {


Patches currently in stable-queue which might be from s.hauer@xxxxxxxxxxxxxx are

queue-6.2/wifi-rtw88-rtw8821c-fix-rfe_option-field-width.patch
queue-6.2/wifi-rtw88-usb-fix-priority-queue-to-endpoint-mapping.patch



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