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Date: Mon, 6 Apr 2015 14:29:05 -0700
From: Andrew Bresticker <abrestic@...omium.org>
To: Mark Brown <broonie@...nel.org>
Cc: linux-spi@...r.kernel.org, linux-kernel@...r.kernel.org,
Ezequiel Garcia <ezequiel.garcia@...tec.com>,
Andrew Bresticker <abrestic@...omium.org>
Subject: [PATCH 3/5] spi: img-spfi: Implement an unprepare_message() callback
From: Ezequiel Garcia <ezequiel.garcia@...tec.com>
The driver can be greatly simplified by moving the transfer
finishing and timeout handling to an unprepare_message() callback.
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@...tec.com>
Signed-off-by: Andrew Bresticker <abrestic@...omium.org>
---
drivers/spi/spi-img-spfi.c | 45 +++++++++++++++++++++++++--------------------
1 file changed, 25 insertions(+), 20 deletions(-)
diff --git a/drivers/spi/spi-img-spfi.c b/drivers/spi/spi-img-spfi.c
index b1c0165..30c89f9 100644
--- a/drivers/spi/spi-img-spfi.c
+++ b/drivers/spi/spi-img-spfi.c
@@ -271,7 +271,6 @@ static int img_spfi_start_pio(struct spi_master *master,
if (rx_bytes > 0 || tx_bytes > 0) {
dev_err(spfi->dev, "PIO transfer timed out\n");
- spfi_reset(spfi);
return -ETIMEDOUT;
}
@@ -397,6 +396,30 @@ stop_dma:
return -EIO;
}
+static int img_spfi_unprepare(struct spi_master *master, struct spi_message *m)
+{
+ struct img_spfi *spfi = spi_master_get_devdata(master);
+ unsigned long flags;
+
+ /*
+ * Stop all DMA and reset the controller if the previous transaction
+ * timed-out and never completed it's DMA.
+ */
+ spin_lock_irqsave(&spfi->lock, flags);
+ if (spfi->tx_dma_busy || spfi->rx_dma_busy) {
+ spfi->tx_dma_busy = false;
+ spfi->rx_dma_busy = false;
+
+ dmaengine_terminate_all(spfi->tx_ch);
+ dmaengine_terminate_all(spfi->rx_ch);
+ }
+ spin_unlock_irqrestore(&spfi->lock, flags);
+
+ spfi_reset(spfi);
+
+ return 0;
+}
+
static int img_spfi_prepare(struct spi_master *master, struct spi_message *msg)
{
struct img_spfi *spfi = spi_master_get_devdata(master);
@@ -462,8 +485,6 @@ static int img_spfi_transfer_one(struct spi_master *master,
struct spi_transfer *xfer)
{
struct img_spfi *spfi = spi_master_get_devdata(spi->master);
- bool dma_reset = false;
- unsigned long flags;
int ret;
if (xfer->len > SPFI_TRANSACTION_TSIZE_MASK) {
@@ -473,23 +494,6 @@ static int img_spfi_transfer_one(struct spi_master *master,
return -EINVAL;
}
- /*
- * Stop all DMA and reset the controller if the previous transaction
- * timed-out and never completed it's DMA.
- */
- spin_lock_irqsave(&spfi->lock, flags);
- if (spfi->tx_dma_busy || spfi->rx_dma_busy) {
- dev_err(spfi->dev, "SPI DMA still busy\n");
- dma_reset = true;
- }
- spin_unlock_irqrestore(&spfi->lock, flags);
-
- if (dma_reset) {
- dmaengine_terminate_all(spfi->tx_ch);
- dmaengine_terminate_all(spfi->rx_ch);
- spfi_reset(spfi);
- }
-
img_spfi_config(master, spi, xfer);
if (master->can_dma && master->can_dma(master, spi, xfer))
ret = img_spfi_start_dma(master, spi, xfer);
@@ -607,6 +611,7 @@ static int img_spfi_probe(struct platform_device *pdev)
master->set_cs = img_spfi_set_cs;
master->transfer_one = img_spfi_transfer_one;
master->prepare_message = img_spfi_prepare;
+ master->unprepare_message = img_spfi_unprepare;
spfi->tx_ch = dma_request_slave_channel(spfi->dev, "tx");
spfi->rx_ch = dma_request_slave_channel(spfi->dev, "rx");
--
2.2.0.rc0.207.ga3a616c
--
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