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SubjectRe: [PATCH v3 3/7] usb: mtu3: support ip-sleep wakeup for MT8183
On Fri, Aug 30, 2019 at 03:40:50PM +0800, Chunfeng Yun wrote:
> Support USB wakeup by ip-sleep mode for MT8183, it's similar to
> MT8173
>
> Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
> ---
> v3: changes micros define
>
> v2: no changes
> ---
> drivers/usb/mtu3/mtu3_host.c | 14 +++++++++++++-
> 1 file changed, 13 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/mtu3/mtu3_host.c b/drivers/usb/mtu3/mtu3_host.c
> index c871b94f3e6f..4f8208885ebd 100644
> --- a/drivers/usb/mtu3/mtu3_host.c
> +++ b/drivers/usb/mtu3/mtu3_host.c
> @@ -18,6 +18,12 @@
> #include "mtu3.h"
> #include "mtu3_dr.h"
>
> +/* mt8183 etc */
> +#define PERI_WK_CTRL0 0x20
> +#define WC0_IS_C(x) (((x) & 0xf) << 28) /* cycle debounce */
> +#define WC0_IS_P BIT(12) /* polarity */
> +#define WC0_IS_EN BIT(6)
> +

For 64-bit builds, this results in:

drivers/usb/mtu3/mtu3_host.c: In function ‘ssusb_wakeup_ip_sleep_set’:
./include/linux/bits.h:6:19: warning:
conversion from ‘long unsigned int’ to ‘u32’ {aka ‘unsigned int’}
changes value from ‘18446744073441120320’ to ‘4026536000’ [-Woverflow]

since WC0_IS_C() is sign extended to 64 bit and then truncated.

Observed with gcc 7.4.0 and 8.3.0.

Guenter

> /* mt8173 etc */
> #define PERI_WK_CTRL1 0x4
> #define WC1_IS_C(x) (((x) & 0xf) << 26) /* cycle debounce */
> @@ -30,7 +36,8 @@
> #define SSC_SPM_INT_EN BIT(1)
>
> enum ssusb_uwk_vers {
> - SSUSB_UWK_V1 = 1,
> + SSUSB_UWK_V0 = 0,
> + SSUSB_UWK_V1,
> SSUSB_UWK_V2,
> };
>
> @@ -43,6 +50,11 @@ static void ssusb_wakeup_ip_sleep_set(struct ssusb_mtk *ssusb, bool enable)
> u32 reg, msk, val;
>
> switch (ssusb->uwk_vers) {
> + case SSUSB_UWK_V0:
> + reg = ssusb->uwk_reg_base + PERI_WK_CTRL0;
> + msk = WC0_IS_EN | WC0_IS_C(0xf) | WC0_IS_P;
> + val = enable ? (WC0_IS_EN | WC0_IS_C(0x8)) : 0;
> + break;
> case SSUSB_UWK_V1:
> reg = ssusb->uwk_reg_base + PERI_WK_CTRL1;
> msk = WC1_IS_EN | WC1_IS_C(0xf) | WC1_IS_P;

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