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ppc/pnv: Use resettable interface to reset child I2C buses

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The QEMU I2C buses and devices use the resettable
interface for resetting while the PNV I2C controller
and parent buses and devices have not yet transitioned
to this new interface and use the old reset strategy.
This was preventing the I2C buses and devices wired
to the PNV I2C controller from being reset.

The short term fix for this is to have the PNV I2C
Controller's reset function explicitly call the resettable
interface function, bus_cold_reset(), on all child
I2C buses.

The long term fix should be to transition all PNV parent
devices and buses to use the resettable interface so that
all child buses and devices are automatically reset.

Reviewed-by: Cédric Le Goater <clg@kaod.org>
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
This commit is contained in:
Glenn Miles 2024-02-05 17:40:16 +10:00 committed by Nicholas Piggin
parent 6f86885a74
commit 7b85f008b6
1 changed files with 14 additions and 1 deletions
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15
hw/ppc/pnv_i2c.c
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@ -629,6 +629,19 @@ static int pnv_i2c_dt_xscom(PnvXScomInterface *dev, void *fdt,
return 0;
}
static void pnv_i2c_sys_reset(void *dev)
{
int port;
PnvI2C *i2c = PNV_I2C(dev);
pnv_i2c_reset(dev);
/* reset all buses connected to this i2c controller */
for (port = 0; port < i2c->num_busses; port++) {
bus_cold_reset(BUS(i2c->busses[port]));
}
}
static void pnv_i2c_realize(DeviceState *dev, Error **errp)
{
PnvI2C *i2c = PNV_I2C(dev);
@ -654,7 +667,7 @@ static void pnv_i2c_realize(DeviceState *dev, Error **errp)
fifo8_create(&i2c->fifo, PNV_I2C_FIFO_SIZE);
qemu_register_reset(pnv_i2c_reset, dev);
qemu_register_reset(pnv_i2c_sys_reset, dev);
qdev_init_gpio_out(DEVICE(dev), &i2c->psi_irq, 1);
}