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mac80211: ath10k: fix latency issue for QCA988x

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This backport fixes high latency (>100ms) on the WiFi link when using a
QCA988x Wave 1 radio. The ath10k-ct driver is not affected by this bug
from my testing, hence why it hasn't been discovered earlier.

Signed-off-by: David Bauer <mail@david-bauer.net>
This commit is contained in:
David Bauer 2019-10-04 22:28:15 +02:00
parent 34e2526f9f
commit 97c37f8dd0
1 changed files with 42 additions and 0 deletions
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42
package/kernel/mac80211/patches/ath/982-ath10k-fix-latency-issue-for-QCA988x.patch Normal file
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@ -0,0 +1,42 @@
From: Miaoqing Pan <miaoqing@codeaurora.org>
Subject: [PATCH] ath10k: fix latency issue for QCA988x
Date: Thu, 29 Aug 2019 10:45:12 +0800
Bad latency is found on QCA988x, the issue was introduced by
commit 4504f0e5b571 ("ath10k: sdio: workaround firmware UART
pin configuration bug"). If uart_pin_workaround is false, this
change will set uart pin even if uart_print is false.
Tested HW: QCA9880
Tested FW: 10.2.4-1.0-00037
Fixes: 4504f0e5b571 ("ath10k: sdio: workaround firmware UART pin configuration bug")
Signed-off-by: Miaoqing Pan <miaoqing@codeaurora.org>
---
drivers/net/wireless/ath/ath10k/core.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
--- a/drivers/net/wireless/ath/ath10k/core.c
+++ b/drivers/net/wireless/ath/ath10k/core.c
@@ -2124,12 +2124,15 @@ static int ath10k_init_uart(struct ath10
return ret;
}
- if (!uart_print && ar->hw_params.uart_pin_workaround) {
- ret = ath10k_bmi_write32(ar, hi_dbg_uart_txpin,
- ar->hw_params.uart_pin);
- if (ret) {
- ath10k_warn(ar, "failed to set UART TX pin: %d", ret);
- return ret;
+ if (!uart_print) {
+ if (ar->hw_params.uart_pin_workaround) {
+ ret = ath10k_bmi_write32(ar, hi_dbg_uart_txpin,
+ ar->hw_params.uart_pin);
+ if (ret) {
+ ath10k_warn(ar, "failed to set UART TX pin: %d",
+ ret);
+ return ret;
+ }
}
return 0;