linux-kernel - [PATCH 4.19 208/422] drivers: qcom: rpmh-rsc: clear wait_for

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Message-Id: <20191119051412.070295360@linuxfoundation.org>
Date:   Tue, 19 Nov 2019 06:16:45 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Raju P.L.S.S.S.N" <rplsssn@...eaurora.org>,
        Lina Iyer <ilina@...eaurora.org>,
        Andy Gross <andy.gross@...aro.org>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 4.19 208/422] drivers: qcom: rpmh-rsc: clear wait_for_compl after use

From: Lina Iyer <ilina@...eaurora.org>

[ Upstream commit 09e97b6c8754c91470455e69ebd827b741f80af5 ]

The wait_for_compl register ensures the request sequence is maintained
when sending requests from the TCS. Clear the register after sending
active request and during invalidate of the sleep and wake TCS.

Reported-by: Raju P.L.S.S.S.N <rplsssn@...eaurora.org>
Signed-off-by: Lina Iyer <ilina@...eaurora.org>
Signed-off-by: Andy Gross <andy.gross@...aro.org>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/soc/qcom/rpmh-rsc.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/soc/qcom/rpmh-rsc.c b/drivers/soc/qcom/rpmh-rsc.c
index ee75da66d64bf..75bd9a83aef00 100644
--- a/drivers/soc/qcom/rpmh-rsc.c
+++ b/drivers/soc/qcom/rpmh-rsc.c
@@ -121,6 +121,7 @@ static int tcs_invalidate(struct rsc_drv *drv, int type)
 			return -EAGAIN;
 		}
 		write_tcs_reg_sync(drv, RSC_DRV_CMD_ENABLE, m, 0);
+		write_tcs_reg_sync(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, m, 0);
 	}
 	bitmap_zero(tcs->slots, MAX_TCS_SLOTS);
 	spin_unlock(&tcs->lock);
@@ -239,6 +240,7 @@ static irqreturn_t tcs_tx_done(int irq, void *p)
 skip:
 		/* Reclaim the TCS */
 		write_tcs_reg(drv, RSC_DRV_CMD_ENABLE, i, 0);
+		write_tcs_reg(drv, RSC_DRV_CMD_WAIT_FOR_CMPL, i, 0);
 		write_tcs_reg(drv, RSC_DRV_IRQ_CLEAR, 0, BIT(i));
 		spin_lock(&drv->lock);
 		clear_bit(i, drv->tcs_in_use);
-- 
2.20.1