On 02/26/2015 04:33 AM, Mark Brown wrote:
On Tue, Feb 24, 2015 at 06:08:54PM +0200, Stanimir Varbanov wrote:
yes, there is a potential race between atomic_inc and dma callback. I
reordered these calls to save few checks, and now it returns to me.
I imagine few options here:
- reorder
On Tue, Feb 24, 2015 at 06:08:54PM +0200, Stanimir Varbanov wrote:
yes, there is a potential race between atomic_inc and dma callback. I
reordered these calls to save few checks, and now it returns to me.
I imagine few options here:
- reorder the dmaengine calls and atomic operations, i.e.
From: Andy Gross agr...@codeaurora.org
This patch adds DMA capabilities to the spi-qup driver. If DMA channels are
present, the QUP will use DMA instead of block mode for transfers to/from SPI
peripherals for transactions larger than the length of a block.
Signed-off-by: Andy Gross
On Tue, Feb 24, 2015 at 03:00:03PM +0200, Stanimir Varbanov wrote:
+static void spi_qup_dma_done(void *data)
+{
+ struct spi_qup *qup = data;
+
+ if (atomic_dec_and_test(qup-dma_outstanding))
+ complete(qup-done);
+}
I'm finding it hard to be thrilled about the use of
Hi Stan,
On Tue, 2015-02-24 at 15:00 +0200, Stanimir Varbanov wrote:
snip
#define SPI_MAX_RATE 5000
@@ -143,6 +147,11 @@ struct spi_qup {
int tx_bytes;
int rx_bytes;
int qup_v1;
+
+ int dma_available;
This is more
On 02/24/2015 03:56 PM, Mark Brown wrote:
On Tue, Feb 24, 2015 at 03:00:03PM +0200, Stanimir Varbanov wrote:
+static void spi_qup_dma_done(void *data)
+{
+struct spi_qup *qup = data;
+
+if (atomic_dec_and_test(qup-dma_outstanding))
+complete(qup-done);
+}
I'm
Hi Stan,
Sorry I didn't saw this first look.
On Tue, 2015-02-24 at 15:00 +0200, Stanimir Varbanov wrote:
snip
+static bool spi_qup_can_dma(struct spi_master *master, struct spi_device
*spi,
+ struct spi_transfer
*xfer)
+{
+
On Tue, Feb 24, 2015 at 06:08:54PM +0200, Stanimir Varbanov wrote:
snip
yes, there is a potential race between atomic_inc and dma callback. I
reordered these calls to save few checks, and now it returns to me.
I imagine few options here:
- reorder the dmaengine calls and atomic
