Re: [PATCH] ppc/pnv: Fix number of I2C engines and ports for power9/10

["Cédric Le Goater" <clg@kaod.org>]

Hello Glenn,

On 10/23/23 18:52, Glenn Miles wrote:
> Power9 is supposed to have 4 PIB-connected I2C engines with the
> following number of ports on each engine:
> 
>      0: 2
>      1: 13
>      2: 2
>      3: 2
> 
> Power10 also has 4 engines but has the following number of ports
> on each engine:
> 
>      0: 14
>      1: 14
>      2: 2
>      3: 16
> 
> Current code assumes that they all have the same (maximum) number.
> This can be a problem if software expects to see a certain number
> of ports present (Power Hypervisor seems to care).

Nice ! Do you have plans to populate the I2C busses ?
  
> Fixed this by adding separate tables for power9 and power10 that
> map the I2C controller number to the number of I2C buses that should
> be attached for that engine.
> 
> Signed-off-by: Glenn Miles <milesg@linux.vnet.ibm.com>
> ---
> 
> Based-on: <20231017221434.810363-1-milesg@linux.vnet.ibm.com>
> ([PATCH] ppc/pnv: Connect PNV I2C controller to powernv10)
> 
>   hw/ppc/pnv.c              | 12 ++++++++----
>   include/hw/ppc/pnv_chip.h |  5 +----
>   2 files changed, 9 insertions(+), 8 deletions(-)
> 
> diff --git a/hw/ppc/pnv.c b/hw/ppc/pnv.c
> index 2655b6e506..6ad4a1a7b1 100644
> --- a/hw/ppc/pnv.c
> +++ b/hw/ppc/pnv.c
> @@ -1507,6 +1507,8 @@ static void pnv_chip_power9_pec_realize(PnvChip *chip, Error **errp)
>       }
>   }
>   
> +static int pnv_power9_i2c_ports_per_ctlr[PNV9_CHIP_MAX_I2C] = {2, 13, 2, 2};

The ports array could be under PnvChipClass. Anyhow,

Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.




>   static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
>   {
>       PnvChipClass *pcc = PNV_CHIP_GET_CLASS(dev);
> @@ -1626,7 +1628,8 @@ static void pnv_chip_power9_realize(DeviceState *dev, Error **errp)
>           Object *obj =  OBJECT(&chip9->i2c[i]);
>   
>           object_property_set_int(obj, "engine", i + 1, &error_fatal);
> -        object_property_set_int(obj, "num-busses", pcc->i2c_num_ports,
> +        object_property_set_int(obj, "num-busses",
> +                                pnv_power9_i2c_ports_per_ctlr[i],
>                                   &error_fatal);
>           object_property_set_link(obj, "chip", OBJECT(chip), &error_abort);
>           if (!qdev_realize(DEVICE(obj), NULL, errp)) {
> @@ -1667,7 +1670,6 @@ static void pnv_chip_power9_class_init(ObjectClass *klass, void *data)
>       dc->desc = "PowerNV Chip POWER9";
>       k->num_pecs = PNV9_CHIP_MAX_PEC;
>       k->i2c_num_engines = PNV9_CHIP_MAX_I2C;
> -    k->i2c_num_ports = PNV9_CHIP_MAX_I2C_PORTS;
>   
>       device_class_set_parent_realize(dc, pnv_chip_power9_realize,
>                                       &k->parent_realize);
> @@ -1751,6 +1753,8 @@ static void pnv_chip_power10_phb_realize(PnvChip *chip, Error **errp)
>       }
>   }
>   
> +static int pnv_power10_i2c_ports_per_ctlr[PNV10_CHIP_MAX_I2C] = {14, 14, 2, 16};
> +
>   static void pnv_chip_power10_realize(DeviceState *dev, Error **errp)
>   {
>       PnvChipClass *pcc = PNV_CHIP_GET_CLASS(dev);
> @@ -1877,7 +1881,8 @@ static void pnv_chip_power10_realize(DeviceState *dev, Error **errp)
>           Object *obj =  OBJECT(&chip10->i2c[i]);
>   
>           object_property_set_int(obj, "engine", i + 1, &error_fatal);
> -        object_property_set_int(obj, "num-busses", pcc->i2c_num_ports,
> +        object_property_set_int(obj, "num-busses",
> +                                pnv_power10_i2c_ports_per_ctlr[i],
>                                   &error_fatal);
>           object_property_set_link(obj, "chip", OBJECT(chip), &error_abort);
>           if (!qdev_realize(DEVICE(obj), NULL, errp)) {
> @@ -1918,7 +1923,6 @@ static void pnv_chip_power10_class_init(ObjectClass *klass, void *data)
>       dc->desc = "PowerNV Chip POWER10";
>       k->num_pecs = PNV10_CHIP_MAX_PEC;
>       k->i2c_num_engines = PNV10_CHIP_MAX_I2C;
> -    k->i2c_num_ports = PNV10_CHIP_MAX_I2C_PORTS;
>   
>       device_class_set_parent_realize(dc, pnv_chip_power10_realize,
>                                       &k->parent_realize);
> diff --git a/include/hw/ppc/pnv_chip.h b/include/hw/ppc/pnv_chip.h
> index 5815d96ecf..be1fec5698 100644
> --- a/include/hw/ppc/pnv_chip.h
> +++ b/include/hw/ppc/pnv_chip.h
> @@ -88,8 +88,7 @@ struct Pnv9Chip {
>   #define PNV9_CHIP_MAX_PEC 3
>       PnvPhb4PecState pecs[PNV9_CHIP_MAX_PEC];
>   
> -#define PNV9_CHIP_MAX_I2C 3
> -#define PNV9_CHIP_MAX_I2C_PORTS 1
> +#define PNV9_CHIP_MAX_I2C 4
>       PnvI2C      i2c[PNV9_CHIP_MAX_I2C];
>   };
>   
> @@ -122,7 +121,6 @@ struct Pnv10Chip {
>       PnvPhb4PecState pecs[PNV10_CHIP_MAX_PEC];
>   
>   #define PNV10_CHIP_MAX_I2C 4
> -#define PNV10_CHIP_MAX_I2C_PORTS 2
>       PnvI2C       i2c[PNV10_CHIP_MAX_I2C];
>   };
>   
> @@ -140,7 +138,6 @@ struct PnvChipClass {
>       uint32_t     num_phbs;
>   
>       uint32_t     i2c_num_engines;
> -    uint32_t     i2c_num_ports;
>   
>       DeviceRealize parent_realize;
>