linux-kernel - Re: [PATCH v2 10/10] rtw88: disable powersave modes for USB devices

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Message-ID: <1493412d473614dfafd4c03832e71f86831fa43b.camel@realtek.com>
Date:   Tue, 31 May 2022 01:07:36 +0000
From:   Ping-Ke Shih <pkshih@...ltek.com>
To:     "s.hauer@...gutronix.de" <s.hauer@...gutronix.de>,
        "linux-wireless@...r.kernel.org" <linux-wireless@...r.kernel.org>
CC:     "johannes@...solutions.net" <johannes@...solutions.net>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        "neojou@...il.com" <neojou@...il.com>,
        "kvalo@...nel.org" <kvalo@...nel.org>,
        "tony0620emma@...il.com" <tony0620emma@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "martin.blumenstingl@...glemail.com" 
        <martin.blumenstingl@...glemail.com>,
        "linux@...i-kroll.de" <linux@...i-kroll.de>,
        "netdev@...r.kernel.org" <netdev@...r.kernel.org>
Subject: Re: [PATCH v2 10/10] rtw88: disable powersave modes for USB devices

On Mon, 2022-05-30 at 15:54 +0200, Sascha Hauer wrote:
> The powersave modes do not work with USB devices (tested with a
> RTW8822CU) properly. With powersave modes enabled the driver issues
> messages like:
> 
> rtw_8822cu 1-1:1.2: firmware failed to leave lps state
> rtw_8822cu 1-1:1.2: timed out to flush queue 3

Could you try module parameter rtw_disable_lps_deep_mode=1 to see
if it can work?

If it works, I suggest to apply below code: 

diff --git a/main.c b/main.c
index 3f7a5d54..3bb07898 100644
--- a/main.c
+++ b/main.c
@@ -1345,6 +1345,9 @@ static enum rtw_lps_deep_mode rtw_update_lps_deep_mode(struct rtw_dev *rtwdev,
 {
        struct rtw_chip_info *chip = rtwdev->chip;
 
+       if (rtw_hci_type(rtwdev) == RTW_HCI_TYPE_USB)
+               return LPS_DEEP_MODE_NONE;
+
        if (rtw_disable_lps_deep_mode || !chip->lps_deep_mode_supported ||
            !fw->feature)
                return LPS_DEEP_MODE_NONE;

--
Ping-Ke