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ppc/pnv: Fix PNV I2C invalid status after reset 

The PNV I2C Controller was clearing the status register
after a reset without repopulating the "upper threshold
for I2C ports", "Command Complete" and the SCL/SDA input
level fields.

Fixed this for resets caused by a system reset as well
as from writing to the "Immediate Reset" register.

Fixes: 263b81ee15 ("ppc/pnv: Add an I2C controller model")
Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
Signed-off-by: Cédric Le Goater <clg@kaod.org>
This commit is contained in:
Glenn Miles 2023-11-14 13:56:55 -06:00 committed by Cédric Le Goater
parent 47dfdd238d
commit b664466d8f
1 changed files with 18 additions and 24 deletions
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42
hw/ppc/pnv_i2c.c
View File

@ -463,6 +463,23 @@ static uint64_t pnv_i2c_xscom_read(void *opaque, hwaddr addr,
return val;
}
static void pnv_i2c_reset(void *dev)
{
PnvI2C *i2c = PNV_I2C(dev);
memset(i2c->regs, 0, sizeof(i2c->regs));
i2c->regs[I2C_STAT_REG] =
SETFIELD(I2C_STAT_UPPER_THRS, 0ull, i2c->num_busses - 1) |
I2C_STAT_CMD_COMP | I2C_STAT_SCL_INPUT_LEVEL |
I2C_STAT_SDA_INPUT_LEVEL;
i2c->regs[I2C_EXTD_STAT_REG] =
SETFIELD(I2C_EXTD_STAT_FIFO_SIZE, 0ull, PNV_I2C_FIFO_SIZE) |
SETFIELD(I2C_EXTD_STAT_I2C_VERSION, 0ull, 23); /* last version */
fifo8_reset(&i2c->fifo);
}
static void pnv_i2c_xscom_write(void *opaque, hwaddr addr,
uint64_t val, unsigned size)
{
@ -500,16 +517,7 @@ static void pnv_i2c_xscom_write(void *opaque, hwaddr addr,
break;
case I2C_RESET_I2C_REG:
i2c->regs[I2C_MODE_REG] = 0;
i2c->regs[I2C_CMD_REG] = 0;
i2c->regs[I2C_WATERMARK_REG] = 0;
i2c->regs[I2C_INTR_MASK_REG] = 0;
i2c->regs[I2C_INTR_COND_REG] = 0;
i2c->regs[I2C_INTR_RAW_COND_REG] = 0;
i2c->regs[I2C_STAT_REG] = 0;
i2c->regs[I2C_RESIDUAL_LEN_REG] = 0;
i2c->regs[I2C_EXTD_STAT_REG] &=
(I2C_EXTD_STAT_FIFO_SIZE | I2C_EXTD_STAT_I2C_VERSION);
pnv_i2c_reset(i2c);
break;
case I2C_RESET_ERRORS:
@ -621,20 +629,6 @@ static int pnv_i2c_dt_xscom(PnvXScomInterface *dev, void *fdt,
return 0;
}
static void pnv_i2c_reset(void *dev)
{
PnvI2C *i2c = PNV_I2C(dev);
memset(i2c->regs, 0, sizeof(i2c->regs));
i2c->regs[I2C_STAT_REG] = I2C_STAT_CMD_COMP;
i2c->regs[I2C_EXTD_STAT_REG] =
SETFIELD(I2C_EXTD_STAT_FIFO_SIZE, 0ull, PNV_I2C_FIFO_SIZE) |
SETFIELD(I2C_EXTD_STAT_I2C_VERSION, 0ull, 23); /* last version */
fifo8_reset(&i2c->fifo);
}
static void pnv_i2c_realize(DeviceState *dev, Error **errp)
{
PnvI2C *i2c = PNV_I2C(dev);