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| author |   Henry Chen <henryc.chen@mediatek.com> | 2016-01-04 20:02:52 +0800 |
|---|---|---|
| committer |   Matthias Brugger <matthias.bgg@gmail.com> | 2016-01-25 18:59:41 +0100 |
| commit | 73efe5792bfa73589a7e04abf773f8b7a4c01650 (patch) | |
| tree | b751f509e291a7f84a4235af95cdbb9fa6b50dc4 /drivers/soc | |
| parent | Linux 4.5-rc1 (diff) | |
| download | linux-dev-73efe5792bfa73589a7e04abf773f8b7a4c01650.tar.xz linux-dev-73efe5792bfa73589a7e04abf773f8b7a4c01650.zip | |
soc: mediatek: PMIC wrap: Clear the vldclr if state machine stay on FSM_VLDCLR state.
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 beginning of the
read/write function.
Clear the vldclr when timeout if state machine stay on FSM_VLDCLR.
Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
Tested-by: Ricky Liang <jcliang@chromium.org>
Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
Diffstat (limited to 'drivers/soc')
| -rw-r--r-- | drivers/soc/mediatek/mtk-pmic-wrap.c | 22 |
1 files changed, 20 insertions, 2 deletions
diff --git a/drivers/soc/mediatek/mtk-pmic-wrap.c b/drivers/soc/mediatek/mtk-pmic-wrap.c index 105597a885cb..696071b66c41 100644 --- a/drivers/soc/mediatek/mtk-pmic-wrap.c +++ b/drivers/soc/mediatek/mtk-pmic-wrap.c @@ -412,6 +412,20 @@ static bool pwrap_is_fsm_vldclr(struct pmic_wrapper *wrp) return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR; } +/* + * Timeout issue sometimes caused by the last read command + * failed because pmic wrap could not got the FSM_VLDCLR + * in time after finishing WACS2_CMD. It made state machine + * still on FSM_VLDCLR and timeout next time. + * Check the status of FSM and clear the vldclr to recovery the + * error. + */ +static inline void pwrap_leave_fsm_vldclr(struct pmic_wrapper *wrp) +{ + if (pwrap_is_fsm_vldclr(wrp)) + pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR); +} + static bool pwrap_is_sync_idle(struct pmic_wrapper *wrp) { return pwrap_readl(wrp, PWRAP_WACS2_RDATA) & PWRAP_STATE_SYNC_IDLE0; @@ -445,8 +459,10 @@ static int pwrap_write(struct pmic_wrapper *wrp, u32 adr, u32 wdata) int ret; ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle); - if (ret) + if (ret) { + pwrap_leave_fsm_vldclr(wrp); return ret; + } pwrap_writel(wrp, (1 << 31) | ((adr >> 1) << 16) | wdata, PWRAP_WACS2_CMD); @@ -459,8 +475,10 @@ static int pwrap_read(struct pmic_wrapper *wrp, u32 adr, u32 *rdata) int ret; ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle); - if (ret) + if (ret) { + pwrap_leave_fsm_vldclr(wrp); return ret; + } pwrap_writel(wrp, (adr >> 1) << 16, PWRAP_WACS2_CMD); |