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70 lines
2.3 KiB
Diff
70 lines
2.3 KiB
Diff
From 55231d8299d3dccde8588ed2e86c2bc0ef2e12ce Mon Sep 17 00:00:00 2001
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From: Henry Chen <henryc.chen@mediatek.com>
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Date: Mon, 4 Jan 2016 20:02:52 +0800
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Subject: [PATCH 027/102] soc: mediatek: PMIC wrap: Clear the vldclr if state
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machine stay on FSM_VLDCLR state.
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Sometimes PMIC is too busy to send data in time to cause pmic wrap timeout,
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because pmic wrap is waiting for FSM_VLDCLR after finishing WACS2_CMD. It
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just return error when issue happened, so the state machine will stay on
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FSM_VLDCLR state when data send back later by PMIC and timeout again in next
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time because pmic wrap waiting for FSM_IDLE state at the beginning of the
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read/write function.
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Clear the vldclr when timeout if state machine stay on FSM_VLDCLR.
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Signed-off-by: Henry Chen <henryc.chen@mediatek.com>
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Tested-by: Ricky Liang <jcliang@chromium.org>
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Signed-off-by: Matthias Brugger <matthias.bgg@gmail.com>
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---
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drivers/soc/mediatek/mtk-pmic-wrap.c | 22 ++++++++++++++++++++--
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1 file changed, 20 insertions(+), 2 deletions(-)
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--- a/drivers/soc/mediatek/mtk-pmic-wrap.c
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+++ b/drivers/soc/mediatek/mtk-pmic-wrap.c
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@@ -412,6 +412,20 @@ static bool pwrap_is_fsm_vldclr(struct p
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return PWRAP_GET_WACS_FSM(val) == PWRAP_WACS_FSM_WFVLDCLR;
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}
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+/*
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+ * Timeout issue sometimes caused by the last read command
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+ * failed because pmic wrap could not got the FSM_VLDCLR
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+ * in time after finishing WACS2_CMD. It made state machine
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+ * still on FSM_VLDCLR and timeout next time.
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+ * Check the status of FSM and clear the vldclr to recovery the
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+ * error.
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+ */
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+static inline void pwrap_leave_fsm_vldclr(struct pmic_wrapper *wrp)
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+{
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+ if (pwrap_is_fsm_vldclr(wrp))
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+ pwrap_writel(wrp, 1, PWRAP_WACS2_VLDCLR);
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+}
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+
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static bool pwrap_is_sync_idle(struct pmic_wrapper *wrp)
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{
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return pwrap_readl(wrp, PWRAP_WACS2_RDATA) & PWRAP_STATE_SYNC_IDLE0;
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@@ -445,8 +459,10 @@ static int pwrap_write(struct pmic_wrapp
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int ret;
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ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle);
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- if (ret)
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+ if (ret) {
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+ pwrap_leave_fsm_vldclr(wrp);
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return ret;
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+ }
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pwrap_writel(wrp, (1 << 31) | ((adr >> 1) << 16) | wdata,
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PWRAP_WACS2_CMD);
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@@ -459,8 +475,10 @@ static int pwrap_read(struct pmic_wrappe
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int ret;
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ret = pwrap_wait_for_state(wrp, pwrap_is_fsm_idle);
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- if (ret)
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+ if (ret) {
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+ pwrap_leave_fsm_vldclr(wrp);
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return ret;
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+ }
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pwrap_writel(wrp, (adr >> 1) << 16, PWRAP_WACS2_CMD);
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