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From:   Greg Kroah-Hartman <gregkh@linuxfoundation.org>
To:     linux-kernel@vger.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        stable@vger.kernel.org,
        Sowjanya Komatineni <skomatineni@nvidia.com>,
        Mark Brown <broonie@kernel.org>,
        Sasha Levin <sashal@kernel.org>
Subject: [PATCH 4.19 284/639] spi: tegra114: terminate dma and reset on transfer timeout
Date:   Fri, 24 Jan 2020 10:27:34 +0100
Message-Id: <20200124093122.422579088@linuxfoundation.org>
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From: Sowjanya Komatineni <skomatineni@nvidia.com>

[ Upstream commit 32bd1a9551cae34e6889afa235c7afdfede9aeac ]

Fixes: terminate DMA and perform controller reset on transfer timeout
to clear the FIFO's and errors.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/spi/spi-tegra114.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index 17c2c78318f71..b1b726673f850 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -869,7 +869,16 @@ static int tegra_spi_transfer_one_message(struct spi_master *master,
 		if (WARN_ON(ret == 0)) {
 			dev_err(tspi->dev,
 				"spi transfer timeout, err %d\n", ret);
+			if (tspi->is_curr_dma_xfer &&
+			    (tspi->cur_direction & DATA_DIR_TX))
+				dmaengine_terminate_all(tspi->tx_dma_chan);
+			if (tspi->is_curr_dma_xfer &&
+			    (tspi->cur_direction & DATA_DIR_RX))
+				dmaengine_terminate_all(tspi->rx_dma_chan);
 			ret = -EIO;
+			reset_control_assert(tspi->rst);
+			udelay(2);
+			reset_control_deassert(tspi->rst);
 			goto complete_xfer;
 		}
 
-- 
2.20.1