netdev - Re: [PATCH] rtw88: Add delay on polling h2c command status bit

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Message-Id: <94EAAF7E-66C5-40E2-B6A9-0787CB13A3A9@canonical.com>
Date:   Mon, 6 Apr 2020 21:18:20 +0800
From:   Kai-Heng Feng <kai.heng.feng@...onical.com>
To:     Kalle Valo <kvalo@...eaurora.org>
Cc:     Tony Chuang <yhchuang@...ltek.com>,
        "David S. Miller" <davem@...emloft.net>,
        "open list:REALTEK WIRELESS DRIVER (rtw88)" 
        <linux-wireless@...r.kernel.org>,
        "open list:NETWORKING DRIVERS" <netdev@...r.kernel.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] rtw88: Add delay on polling h2c command status bit



> On Apr 6, 2020, at 20:17, Kalle Valo <kvalo@...eaurora.org> wrote:
> 
> Kai-Heng Feng <kai.heng.feng@...onical.com> writes:
> 
>> On some systems we can constanly see rtw88 complains:
>> [39584.721375] rtw_pci 0000:03:00.0: failed to send h2c command
>> 
>> Increase interval of each check to wait the status bit really changes.
>> 
>> While at it, add some helpers so we can use standarized
>> readx_poll_timeout() macro.
> 
> One logical change per patch, please.

Will split it into two separate patches.

> 
>> --- a/drivers/net/wireless/realtek/rtw88/hci.h
>> +++ b/drivers/net/wireless/realtek/rtw88/hci.h
>> @@ -253,6 +253,10 @@ rtw_write8_mask(struct rtw_dev *rtwdev, u32 addr, u32 mask, u8 data)
>> 	rtw_write8(rtwdev, addr, set);
>> }
>> 
>> +#define rr8(addr)      rtw_read8(rtwdev, addr)
>> +#define rr16(addr)     rtw_read16(rtwdev, addr)
>> +#define rr32(addr)     rtw_read32(rtwdev, addr)
> 
> For me these macros reduce code readability, not improve anything. They
> hide the use of rtwdev variable, which is evil, and a name like rr8() is
> just way too vague. Please keep the original function names as is.

The inspiration is from another driver.
readx_poll_timeout macro only takes one argument for the op.
Some other drivers have their own poll_timeout implementation,
and I guess it makes sense to make one specific for rtw88.

Kai-Heng

> 
> -- 
> https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches