RE: [PATCH] pinctrl: realtek: Write the encoded slew rate value

[Yu-Chun Lin [林祐君]]

> rtd_pconf_parse_conf() maps slew-rate arguments 1, 10, 20 and 30 to the
> two-bit field values 0, 1, 2 and 3. However, it shifts the original argument into
> the register value instead of using the computed encoding.
> After masking, these arguments write 1, 2, 0 and 2 respectively. In particular,
> the distinct 10 and 30 settings write the same field value.
> 
> Use set_val when constructing the register value so that both individual pin
> and group configuration apply the existing conversion. Leave argument
> validation, field offsets, masks and regmap error handling unchanged.
> 
> Fixes: dcc9334435b0 ("pinctrl: realtek: add support for slew rate, input voltage
> and high VIL")
> Signed-off-by: Baek Kyu, Kim <pocj8ur4in@xxxxxxxxx>

Reviewed-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>
Tested-by: Yu-Chun Lin <eleanor.lin@xxxxxxxxxxx>

Thanks!
Yu-Chun

> ---
> An arm64 QEMU kernel exercised the RTD1625 MAIN2 pin and group
> state-selection paths using the real pinctrl callbacks and a synthetic regmap
> backend. A slew-rate request of 10 wrote field value 2 before the change and 1
> after it, while adjacent bits were preserved. No board device tree, physical
> MMIO or signal timing was tested.
> 
>  drivers/pinctrl/realtek/pinctrl-rtd.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/pinctrl/realtek/pinctrl-rtd.c
> b/drivers/pinctrl/realtek/pinctrl-rtd.c
> index 60222339726b4..656c281c557ac 100644
> --- a/drivers/pinctrl/realtek/pinctrl-rtd.c
> +++ b/drivers/pinctrl/realtek/pinctrl-rtd.c
> @@ -438,7 +438,7 @@ static int rtd_pconf_parse_conf(struct rtd_pinctrl
> *data,
>                 sr_off = config_desc->base_bit +
> config_desc->slew_rate_offset;
>                 reg_off = config_desc->reg_offset;
>                 mask = 0x3 << sr_off;
> -               val = arg << sr_off;
> +               val = set_val << sr_off;
>                 break;
> 
>         case PIN_CONFIG_INPUT_VOLTAGE_UV:
> --
> 2.55.0