On Sun, Aug 2, 2015 at 11:47 PM, Peter Chen <peter.chen@xxxxxxxxxxxxx> wrote:
> The users can change it through dts or platform data if they
> want to change the default value.
>
> Signed-off-by: Peter Chen <peter.chen@xxxxxxxxxxxxx>
> ---
> drivers/usb/chipidea/bits.h | 3 +++
> drivers/usb/chipidea/core.c | 14 ++++++++++++++
> include/linux/usb/chipidea.h | 2 ++
> 3 files changed, 19 insertions(+)
>
> diff --git a/drivers/usb/chipidea/bits.h b/drivers/usb/chipidea/bits.h
> index 831a8f6..462ad02 100644
> --- a/drivers/usb/chipidea/bits.h
> +++ b/drivers/usb/chipidea/bits.h
> @@ -25,6 +25,9 @@
> #define VERSION (0xF << 25)
> #define CIVERSION (0x7 << 29)
>
> +/* SBUSCFG */
> +#define AHBBRST_MASK 0x7
> +
> /* HCCPARAMS */
> #define HCCPARAMS_LEN BIT(17)
>
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 38bd036..f60cbf6 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -439,6 +439,9 @@ void ci_platform_configure(struct ci_hdrc *ci)
>
> hw_write(ci, OP_USBCMD, 0xff0000, ci->platdata->itc_setting << 16);
>
> + if (ci->platdata->flags & CI_HDRC_OVERRIDE_AHB_BURST)
> + hw_write_id_reg(ci, ID_SBUSCFG, AHBBRST_MASK,
> + ci->platdata->ahb_burst_config);
> }
>
> /**
> @@ -647,6 +650,17 @@ static int ci_get_platdata(struct device *dev,
> }
> }
>
> + if (of_find_property(dev->of_node, "ahb-burst-config", NULL)) {
> + ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
> + &platdata->ahb_burst_config);
> + if (ret) {
> + dev_err(dev,
> + "failed to get ahb-burst-config\n");
> + return ret;
> + }
> + platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
> + }
> +
This can be simplified to:
ret = of_property_read_u32(dev->of_node, "ahb-burst-config",
&platdata->ahb_burst_config);
if (!ret)
platdata->flags |= CI_HDRC_OVERRIDE_AHB_BURST;
The error condition can't really happen.
Rob
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