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SubjectRe: [PATCH v2 04/22] usb: chipidea: Only read/write OTGSC from one place
On Thu, Jul 07, 2016 at 03:20:55PM -0700, Stephen Boyd wrote:
> With the id and vbus detection done via extcon we need to make
> sure we poll the status of OTGSC properly by considering what the
> extcon is saying, and not just what the register is saying. Let's
> move this hw_wait_reg() function to the only place it's used and
> simplify it for polling the OTGSC register. Then we can make
> certain we only use the hw_read_otgsc() API to read OTGSC, which
> will make sure we properly handle extcon events.
>
> Cc: Peter Chen <peter.chen@nxp.com>
> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Cc: "Ivan T. Ivanov" <iivanov.xz@gmail.com>
> Fixes: 3ecb3e09b042 ("usb: chipidea: Use extcon framework for VBUS and ID detect")
> Signed-off-by: Stephen Boyd <stephen.boyd@linaro.org>
> ---
> drivers/usb/chipidea/ci.h | 3 ---
> drivers/usb/chipidea/core.c | 32 --------------------------------
> drivers/usb/chipidea/otg.c | 34 ++++++++++++++++++++++++++++++----
> 3 files changed, 30 insertions(+), 39 deletions(-)
>
> diff --git a/drivers/usb/chipidea/ci.h b/drivers/usb/chipidea/ci.h
> index cd414559040f..05bc4d631cb9 100644
> --- a/drivers/usb/chipidea/ci.h
> +++ b/drivers/usb/chipidea/ci.h
> @@ -428,9 +428,6 @@ int hw_port_test_set(struct ci_hdrc *ci, u8 mode);
>
> u8 hw_port_test_get(struct ci_hdrc *ci);
>
> -int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
> - u32 value, unsigned int timeout_ms);
> -
> void ci_platform_configure(struct ci_hdrc *ci);
>
> int dbg_create_files(struct ci_hdrc *ci);
> diff --git a/drivers/usb/chipidea/core.c b/drivers/usb/chipidea/core.c
> index 69426e644d17..01390e02ee53 100644
> --- a/drivers/usb/chipidea/core.c
> +++ b/drivers/usb/chipidea/core.c
> @@ -516,38 +516,6 @@ int hw_device_reset(struct ci_hdrc *ci)
> return 0;
> }
>
> -/**
> - * hw_wait_reg: wait the register value
> - *
> - * Sometimes, it needs to wait register value before going on.
> - * Eg, when switch to device mode, the vbus value should be lower
> - * than OTGSC_BSV before connects to host.
> - *
> - * @ci: the controller
> - * @reg: register index
> - * @mask: mast bit
> - * @value: the bit value to wait
> - * @timeout_ms: timeout in millisecond
> - *
> - * This function returns an error code if timeout
> - */
> -int hw_wait_reg(struct ci_hdrc *ci, enum ci_hw_regs reg, u32 mask,
> - u32 value, unsigned int timeout_ms)
> -{
> - unsigned long elapse = jiffies + msecs_to_jiffies(timeout_ms);
> -
> - while (hw_read(ci, reg, mask) != value) {
> - if (time_after(jiffies, elapse)) {
> - dev_err(ci->dev, "timeout waiting for %08x in %d\n",
> - mask, reg);
> - return -ETIMEDOUT;
> - }
> - msleep(20);
> - }
> -
> - return 0;
> -}
> -
> static irqreturn_t ci_irq(int irq, void *data)
> {
> struct ci_hdrc *ci = data;
> diff --git a/drivers/usb/chipidea/otg.c b/drivers/usb/chipidea/otg.c
> index 03b6743461d1..a6fc60934297 100644
> --- a/drivers/usb/chipidea/otg.c
> +++ b/drivers/usb/chipidea/otg.c
> @@ -104,7 +104,31 @@ void ci_handle_vbus_change(struct ci_hdrc *ci)
> usb_gadget_vbus_disconnect(&ci->gadget);
> }
>
> -#define CI_VBUS_STABLE_TIMEOUT_MS 5000
> +/**
> + * When we switch to device mode, the vbus value should be lower
> + * than OTGSC_BSV before connecting to host.
> + *
> + * @ci: the controller
> + *
> + * This function returns an error code if timeout
> + */
> +static int hw_wait_otgsc_bsv(struct ci_hdrc *ci)

I think the function name should reflect "we wait for vbus lower than bsv"
Care to change one?

--

Best Regards,
Peter Chen

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