On Thu, Nov 21, 2024 at 03:42:52PM +0100, Kory Maincent wrote:
> From: Kory Maincent (Dent Project) <kory.maincent@xxxxxxxxxxx>
>
> This patch enhances PSE callbacks by introducing support for the static
> port priority feature. It extends interrupt management to handle and report
> detection, classification, and disconnection events. Additionally, it
> introduces the pi_get_pw_req() callback, which provides information about
> the power requested by the Powered Devices.
>
> Interrupt support is essential for the proper functioning of the TPS23881
> controller. Without it, after a power-on (PWON), the controller will
> no longer perform detection and classification. This could lead to
> potential hazards, such as connecting a non-PoE device after a PoE device,
> which might result in magic smoke.
>
> Signed-off-by: Kory Maincent <kory.maincent@xxxxxxxxxxx>
> ---
>
> We may need a fix for the interrupt support in old version of Linux.
>
> Change in v3:
> - New patch
> ---
> drivers/net/pse-pd/tps23881.c | 197 ++++++++++++++++++++++++++++++++++++++++--
> 1 file changed, 188 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/net/pse-pd/tps23881.c b/drivers/net/pse-pd/tps23881.c
...
> +static int tps23881_irq_event_detection(struct tps23881_priv *priv,
> + u16 reg_val,
> + unsigned long *notifs,
> + unsigned long *notifs_mask)
> +{
> + enum ethtool_pse_events event;
> + int reg, ret, i, val;
> + u8 chans;
> +
> + chans = tps23881_it_export_chans_helper(reg_val, 0);
> + for_each_set_bit(i, (unsigned long *)&chans, TPS23881_MAX_CHANS) {
Hi Kory,
The storage size of chans is only 1 byte, but here we are pretending that
it has more space. Which seems to be a bit of a stretch. Perhaps it would
be better to simply use unsigned long as the type of chans here and in
tps23881_irq_event_classification().
W=1 build with gcc-14 on x86_64 complains about this line as follows:
In function 'find_next_bit',
inlined from 'tps23881_irq_event_detection' at drivers/net/pse-pd/tps23881.c:1281:2,
inlined from 'tps23881_irq_event_handler' at drivers/net/pse-pd/tps23881.c:1363:9,
inlined from 'tps23881_irq_handler' at drivers/net/pse-pd/tps23881.c:1400:9:
./include/linux/find.h:65:23: warning: array subscript 'long unsigned int[0]' is partly outside array bounds of 'u8[1]' {aka 'unsigned char[1]'} [-Warray-bounds=]
65 | val = *addr & GENMASK(size - 1, offset);
| ^~~~~
drivers/net/pse-pd/tps23881.c: In function 'tps23881_irq_handler':
drivers/net/pse-pd/tps23881.c:1278:12: note: object 'chans' of size 1
1278 | u8 chans;
| ^~~~~
> + reg = TPS23881_REG_DISC + (i % 4);
> + ret = i2c_smbus_read_word_data(priv->client, reg);
> + if (ret < 0)
> + return ret;
> +
> + val = tps23881_calc_val(ret, i, 0, 0xf);
> + /* If detection valid */
> + if (val == 0x4)
> + event = ETHTOOL_C33_PSE_EVENT_DETECTION;
> + else
> + event = ETHTOOL_C33_PSE_EVENT_DISCONNECTION;
> +
> + tps23881_set_notifs_helper(priv, BIT(i), notifs,
> + notifs_mask, event);
> + }
> +
> + return 0;
> +}
...
