From: Meghana Madhyastha <meghana.madhyas...@gmail.com>
The spi core splits up transfers larger than ->max_dma_len now so we can
remove the upper bound on DMA transfers. Limit max_dma_len to 65532,
because the scatter gather segment is required to be a multiple of 4.
Signed-off-by: Meghana Madhyastha <meghana.madhyas...@gmail.com>
Signed-off-by: Noralf Trønnes <nor...@tronnes.org>
---
drivers/spi/spi-bcm2835.c | 15 +--------------
1 file changed, 1 insertion(+), 14 deletions(-)
diff --git a/drivers/spi/spi-bcm2835.c b/drivers/spi/spi-bcm2835.c
index 35aebdfd3b4e..caf33da01ac1 100644
--- a/drivers/spi/spi-bcm2835.c
+++ b/drivers/spi/spi-bcm2835.c
@@ -630,19 +630,6 @@ static bool bcm2835_spi_can_dma(struct spi_master *master,
if (tfr->len < BCM2835_SPI_DMA_MIN_LENGTH)
return false;
- /* BCM2835_SPI_DLEN has defined a max transfer size as
- * 16 bit, so max is 65535
- * we can revisit this by using an alternative transfer
- * method - ideally this would get done without any more
- * interaction...
- */
- if (tfr->len > 65535) {
- dev_warn_once(&spi->dev,
- "transfer size of %d too big for dma-transfer\n",
- tfr->len);
- return false;
- }
-
/* return OK */
return true;
}
@@ -707,7 +694,7 @@ static void bcm2835_dma_init(struct spi_master *master,
struct device *dev)
/* all went well, so set can_dma */
master->can_dma = bcm2835_spi_can_dma;
- master->max_dma_len = 65535; /* limitation by BCM2835_SPI_DLEN */
+ master->max_dma_len = 65532; /* limitation by BCM2835_SPI_DLEN */
/* need to do TX AND RX DMA, so we need dummy buffers */
master->flags = SPI_MASTER_MUST_RX | SPI_MASTER_MUST_TX;
--
2.20.1
_______________________________________________
dri-devel mailing list
dri-devel@lists.freedesktop.org
https://lists.freedesktop.org/mailman/listinfo/dri-devel
