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Date: Thu, 31 Dec 2015 10:09:15 +0800 From: Henry Chen <henryc.chen@...iatek.com> To: Matthias Brugger <matthias.bgg@...il.com> CC: Sascha Hauer <s.hauer@...gutronix.de>, <linux-arm-kernel@...ts.infradead.org>, <linux-mediatek@...ts.infradead.org>, <linux-kernel@...r.kernel.org> Subject: Re: [PATCH] soc: mediatek: PMIC wrap: Clear the vldclr if state machine is stay on FSM_VLDCLR state. Hi Matthias, On Wed, 2015-12-30 at 19:02 +0100, Matthias Brugger wrote: > > On 22/12/15 08:51, Henry Chen wrote: > > Sometimes PMIC is too busy to send data in time to cause pmic wrap timeout, > > because pmic wrap is waiting for FSM_VLDCLR after finishing WACS2_CMD. It > > just return error when issue happened, so the state machine will stay on > > FSM_VLDCLR state when data send back later by PMIC and timeout again in next > > time because pmic wrap waiting for FSM_IDLE state at the begining of the > > read/write function. > > > > Clear the vldclr when timeout if state machine is stay on FSM_VLDCLR. > > > > Signed-off-by: Henry Chen <henryc.chen@...iatek.com> > > --- > > drivers/soc/mediatek/mtk-pmic-wrap.c | 16 ++++++++++++++-- > > 1 file changed, 14 insertions(+), 2 deletions(-) > > > > diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c > > index 105597a..ccd5337 100644 > > --- a/drivers/soc/mediatek/mtk-pmic-wrap.c > > +++ b/drivers/soc/mediatek/mtk-pmic-wrap.c > > @@ -443,10 +443,16 @@ static int pwrap_wait_for_state(struct pmic_wrapper *wrp, > > static int pwrap_write(struct pmic_wrapper *wrp, u32 adr, u32 wdata) > > { > > int ret; > > + u32 val; > > > > ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle); > > - if (ret) > > + if (ret) { > > + /* Clear vldclr bit if state is on the WACS_FSM_WFVLDCLR */ > > + val = pwrap_readl(wrp, PWRAP_WACS2_RDATA); > > + if (PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR) > > + pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR); > > return ret; > > + } > > I would prefer to have this encapsulated in a (inline) function. Maybe > with better description then just the one line comment. > > Thanks, > Matthias Ok, I will make the description more clear, do you means write the function like below and used it on pwrap_write/pwrap_read. static inline void pwrap_leave_fsm_vldclr(struct pmic_wrapper *wrp) { if (pwrap_is_fsm_vldclr(wrp)) pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR); } Thanks, Henry > > > > > pwrap_writel(wrp, (1 << 31) | ((adr >> 1) << 16) | wdata, > > PWRAP_WACS2_CMD); > > @@ -457,10 +463,16 @@ static int pwrap_write(struct pmic_wrapper *wrp, u32 adr, u32 wdata) > > static int pwrap_read(struct pmic_wrapper *wrp, u32 adr, u32 *rdata) > > { > > int ret; > > + u32 val; > > > > ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle); > > - if (ret) > > + if (ret) { > > + /* Clear vldclr bit if state is on the WACS_FSM_WFVLDCLR */ > > + val = pwrap_readl(wrp, PWRAP_WACS2_RDATA); > > + if (PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR) > > + pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR); > > return ret; > > + } > > > > pwrap_writel(wrp, (adr >> 1) << 16, PWRAP_WACS2_CMD); > > > > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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