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Message-ID: <1cc12337-759e-c932-0303-b1b78e254c27@roeck-us.net>
Date: Fri, 28 Jul 2023 03:00:27 -0700
From: Guenter Roeck <linux@...ck-us.net>
To: Naresh Solanki <naresh.solanki@...ements.com>,
Jean Delvare <jdelvare@...e.com>,
krzysztof.kozlowski+dt@...aro.org
Cc: linux-hwmon@...r.kernel.org,
Patrick Rudolph <patrick.rudolph@...ements.com>,
linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hwmon: (pmbus/mp2975) Fix PGOOD in READ_STATUS_WORD
On 7/28/23 01:25, Naresh Solanki wrote:
> From: Patrick Rudolph <patrick.rudolph@...ements.com>
>
> MPS returns PGOOD instead of PB_STATUS_POWER_GOOD_N.
> Fix that in the read_word_data hook.
>
Datasheets are not public, so I can not verify, but the code below
only handles MP2973 and MP2971. What about MP2975 ?
Either case, this appears to affect most Monolithic chips, but
not all of them. Please limit the statement to known to be affected
chips.
> Signed-off-by: Patrick Rudolph <patrick.rudolph@...ements.com>
> Signed-off-by: Naresh Solanki <Naresh.Solanki@...ements.com>
> ---
> drivers/hwmon/pmbus/mp2975.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/drivers/hwmon/pmbus/mp2975.c b/drivers/hwmon/pmbus/mp2975.c
> index 28f33f4618fa..410b6eae6d02 100644
> --- a/drivers/hwmon/pmbus/mp2975.c
> +++ b/drivers/hwmon/pmbus/mp2975.c
> @@ -297,6 +297,10 @@ static int mp2973_read_word_data(struct i2c_client *client, int page,
> int ret;
>
> switch (reg) {
> + case PMBUS_STATUS_WORD:
> + ret = pmbus_read_word_data(client, page, phase, reg);
if (ret < 0)
return ret;
Please add a comment explaining what is going on.
> + ret ^= PB_STATUS_POWER_GOOD_N;
> + break;
> case PMBUS_OT_FAULT_LIMIT:
> ret = mp2975_read_word_helper(client, page, phase, reg,
> GENMASK(7, 0));
>
> base-commit: a4bb1ce5b9e3ca403c04e20ebeae77fd6447cb11
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