linux-kernel - [PATCH AUTOSEL for 3.18 14/16] i2c: riic: fix restart condition

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Message-ID: <20171129172213.29007-14-alexander.levin@verizon.com>
Date:   Wed, 29 Nov 2017 17:22:22 +0000
From:   alexander.levin@...izon.com
To:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Cc:     Chris Brandt <chris.brandt@...esas.com>,
        Wolfram Sang <wsa@...-dreams.de>, alexander.levin@...izon.com
Subject: [PATCH AUTOSEL for 3.18 14/16] i2c: riic: fix restart condition

From: Chris Brandt <chris.brandt@...esas.com>

[ Upstream commit 2501c1bb054290679baad0ff7f4f07c714251f4c ]

While modifying the driver to use the STOP interrupt, the completion of the
intermediate transfers need to wake the driver back up in order to initiate
the next transfer (restart condition). Otherwise you get never ending
interrupts and only the first transfer sent.

Fixes: 71ccea095ea1 ("i2c: riic: correctly finish transfers")
Reported-by: Simon Horman <horms@...ge.net.au>
Signed-off-by: Chris Brandt <chris.brandt@...esas.com>
Tested-by: Simon Horman <horms+renesas@...ge.net.au>
Signed-off-by: Wolfram Sang <wsa@...-dreams.de>
Signed-off-by: Sasha Levin <alexander.levin@...izon.com>
---
 drivers/i2c/busses/i2c-riic.c | 6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/i2c/busses/i2c-riic.c b/drivers/i2c/busses/i2c-riic.c
index 7a7b71e97ba4..43e88e3c1d27 100644
--- a/drivers/i2c/busses/i2c-riic.c
+++ b/drivers/i2c/busses/i2c-riic.c
@@ -218,8 +218,12 @@ static irqreturn_t riic_tend_isr(int irq, void *data)
 	}
 
 	if (riic->is_last || riic->err) {
-		riic_clear_set_bit(riic, 0, ICIER_SPIE, RIIC_ICIER);
+		riic_clear_set_bit(riic, ICIER_TEIE, ICIER_SPIE, RIIC_ICIER);
 		writeb(ICCR2_SP, riic->base + RIIC_ICCR2);
+	} else {
+		/* Transfer is complete, but do not send STOP */
+		riic_clear_set_bit(riic, ICIER_TEIE, 0, RIIC_ICIER);
+		complete(&riic->msg_done);
 	}
 
 	return IRQ_HANDLED;
-- 
2.11.0