linux-kernel - Re: [PATCH v2] clocksource/drivers/fttmr010: fix invalid interrupt register access

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Date:   Wed, 10 Oct 2018 05:50:02 +0000
From:   Tao Ren <taoren@...com>
To:     Linus Walleij <linus.walleij@...aro.org>
CC:     Daniel Lezcano <daniel.lezcano@...aro.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Joel Stanley <joel@....id.au>,
        Andrew Jeffery <andrew@...id.au>,
        Yu Lei <mine260309@...il.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-aspeed@...ts.ozlabs.org" <linux-aspeed@...ts.ozlabs.org>,
        "OpenBMC Maillist" <openbmc@...ts.ozlabs.org>
Subject: Re: [PATCH v2] clocksource/drivers/fttmr010: fix invalid interrupt
 register access

On 10/7/18, 2:03 PM, "Linus Walleij" <linus.walleij@...aro.org> wrote:

>> TIMER_INTR_MASK register (Base Address of Timer + 0x38) is not designed
>> for masking interrupts on ast2500 chips, and it's not even listed in
>> ast2400 datasheet, so it's not safe to access TIMER_INTR_MASK on aspeed
>> chips.
>>
>> Similarly, TIMER_INTR_STATE register (Base Address of Timer + 0x34) is
>> not interrupt status register on ast2400 and ast2500 chips. Although
>> there is no side effect to reset the register in fttmr010_common_init(),
>> it's just misleading to do so.
>>
>> Besides, "count_down" is renamed to "is_aspeed" in "fttmr010" structure,
>> and more comments are added so the code is more readble.
>>
>> Signed-off-by: Tao Ren <taoren@...com>
>> ---
>> Changes in v2:
>>   - "count_down" is renamed to "is_aspeed" in "fttmr010" structure.
>>   - more comments are added to make the code more readable.
>>    
>    Reviewed-by: Linus Walleij <linus.walleij@...aro.org>

Thanks for the review, Linus.


- Tao Ren