linux-kernel - Re: [PATCH 3/3] media: platform: meson-ao-cec-g12a: add wakeup support

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Date:   Thu, 12 Dec 2019 22:30:38 +0100
From:   guillaume La Roque <glaroque@...libre.com>
To:     Martin Blumenstingl <martin.blumenstingl@...glemail.com>
Cc:     Neil Armstrong <narmstrong@...libre.com>, mchehab@...nel.org,
        hverkuil-cisco@...all.nl, khilman@...libre.com,
        devicetree@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-media <linux-media@...r.kernel.org>
Subject: Re: [PATCH 3/3] media: platform: meson-ao-cec-g12a: add wakeup
 support

Hi Martin,


thanks for review

On 12/12/19 8:57 PM, Martin Blumenstingl wrote:
> Hi Guillaume,
>
> (I don't know the specifics of this hardware but I have two general
> comments below)
>
> On Thu, Dec 12, 2019 at 4:00 PM Guillaume La Roque
> <glaroque@...libre.com> wrote:
>> +#define CECB_FUNC_CFG_REG              0xA0
>> +#define CECB_FUNC_CFG_MASK             GENMASK(6, 0)
>> +#define CECB_FUNC_CFG_CEC_ON           0x01
>> +#define CECB_FUNC_CFG_OTP_ON           0x02
>> +#define CECB_FUNC_CFG_AUTO_STANDBY     0x04
>> +#define CECB_FUNC_CFG_AUTO_POWER_ON    0x08
>> +#define CECB_FUNC_CFG_ALL              0x2f
>> +#define CECB_FUNC_CFG_NONE             0x0
>> +
>> +#define CECB_LOG_ADDR_REG      0xA4
>> +#define CECB_LOG_ADDR_MASK     GENMASK(22, 16)
> do these registers have some RTI_* prefix in the datasheet?
> that would make it easier to spot that these registers belong to AO /
> RTI (while all other registers belong to the CEC controller)

as i say register info come from amlogic BSP.

nothing in datasheet unfortunately. in amlogic code , this register are called AO_DEBUG_REG0 and AO_DEBUG_REG1 in amlogic BSP...

>
> [...]
>> +       if (ao_cec->regmap_ao_sysctrl)
>> +               ret |= regmap_update_bits(ao_cec->regmap_ao_sysctrl,
>> +                                        CECB_LOG_ADDR_REG,
>> +                                         CECB_FUNC_CFG_MASK,
> why do we need to mask CECB_FUNC_CFG_MASK (from register 0xa0) in the
> CECB_LOG_ADDR_REG register (0xa4)?
good point, it's an error i will fix
>
>> +                                         logical_addr << CECB_LOG_ADDR_SHIFT);
> FIELD_PREP(CECB_FUNC_CFG_MASK, logical_addr) would make it consistent
> with the rest of the driver
> then you can also drop the #define CECB_LOG_ADDR_SHIFT
i will
>
> Martin