linux-kernel - [PATCH v6 04/14] spi: qup: Place the QUP in run mode before DMA

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Message-Id: <1501224781-19519-5-git-send-email-varada@codeaurora.org>
Date:   Fri, 28 Jul 2017 12:22:51 +0530
From:   Varadarajan Narayanan <varada@...eaurora.org>
To:     broonie@...nel.org, robh+dt@...nel.org, mark.rutland@....com,
        andy.gross@...aro.org, david.brown@...aro.org,
        linux-spi@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-msm@...r.kernel.org,
        linux-soc@...r.kernel.org
Cc:     Varadarajan Narayanan <varada@...eaurora.org>
Subject: [PATCH v6 04/14] spi: qup: Place the QUP in run mode before DMA

Signed-off-by: Andy Gross <andy.gross@...aro.org>
Signed-off-by: Varadarajan Narayanan <varada@...eaurora.org>
---
 drivers/spi/spi-qup.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/drivers/spi/spi-qup.c b/drivers/spi/spi-qup.c
index fdd34c3..f1aa5c1 100644
--- a/drivers/spi/spi-qup.c
+++ b/drivers/spi/spi-qup.c
@@ -343,6 +343,14 @@ static int spi_qup_do_dma(struct spi_master *master, struct spi_transfer *xfer,
 	else if (xfer->tx_buf)
 		tx_done = spi_qup_dma_done;
 
+	/* before issuing the descriptors, set the QUP to run */
+	ret = spi_qup_set_state(qup, QUP_STATE_RUN);
+	if (ret) {
+		dev_warn(qup->dev, "%s(%d): cannot set RUN state\n",
+				__func__, __LINE__);
+		return ret;
+	}
+
 	if (xfer->rx_buf) {
 		ret = spi_qup_prep_sg(master, xfer, DMA_DEV_TO_MEM, rx_done);
 		if (ret)
@@ -385,6 +393,13 @@ static int spi_qup_do_pio(struct spi_master *master, struct spi_transfer *xfer,
 
 	spi_qup_fifo_write(qup, xfer);
 
+	ret = spi_qup_set_state(qup, QUP_STATE_RUN);
+	if (ret) {
+		dev_warn(qup->dev, "%s(%d): cannot set RUN state\n",
+				__func__, __LINE__);
+		return ret;
+	}
+
 	if (!wait_for_completion_timeout(&qup->done, timeout))
 		return -ETIMEDOUT;
 
-- 
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