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i2c: npcm: Enable slave in eob interrupt

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Nuvoton slave enable was in user space API call master_xfer, so it is
subject to delays from the OS scheduler. If the BMC is not enabled for
slave mode in time for master to send response, then it will NAK the
address match. Then the PLDM request timeout occurs.

If the slave enable is moved to the EOB interrupt service routine, then
the BMC can be ready in slave mode by the time it needs to receive a
response.

Signed-off-by: Charles Boyer <Charles.Boyer@fii-usa.com>
Signed-off-by: Vivekanand Veeracholan <vveerach@google.com>
Signed-off-by: Tyrone Ting <kfting@nuvoton.com>
Reviewed-by: Tali Perry <tali.perry1@gmail.com>
Link: https://lore.kernel.org/r/20241219090859.18722-5-kfting@nuvoton.com
Signed-off-by: Andi Shyti <andi.shyti@kernel.org>
This commit is contained in:
Charles Boyer 2024-12-19 17:08:59 +08:00 committed by Andi Shyti
parent 6ddc9132bc
commit 8b56f98b28
1 changed files with 6 additions and 0 deletions
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6
drivers/i2c/busses/i2c-npcm7xx.c
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@ -1925,6 +1925,12 @@ static int npcm_i2c_int_master_handler(struct npcm_i2c *bus)
(FIELD_GET(NPCM_I2CCST3_EO_BUSY,
ioread8(bus->reg + NPCM_I2CCST3)))) {
npcm_i2c_irq_handle_eob(bus);
#if IS_ENABLED(CONFIG_I2C_SLAVE)
/* reenable slave if it was enabled */
if (bus->slave)
iowrite8(bus->slave->addr | NPCM_I2CADDR_SAEN,
bus->reg + NPCM_I2CADDR1);
#endif
return 0;
}