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authorMichal Suchanek <hramrach@gmail.com>2016-06-13 20:46:50 +0300
committerMark Brown <broonie@kernel.org>2016-06-14 12:04:42 +0300
commit794912cff6dba8b5e93948243299bb0b2cb11277 (patch)
treeae2ee6e5e2a4dac0b8e98aea1697adc0fee73329 /drivers/spi/spi-sun4i.c
parent1a695a905c18548062509178b98bc91e67510864 (diff)
downloadlinux-794912cff6dba8b5e93948243299bb0b2cb11277.tar.xz
spi: sunxi: expose maximum transfer size limit
The sun4i spi hardware can trasfer at most 63 bytes of data without DMA support so report the limitation. Same for sun6i. Signed-off-by: Michal Suchanek <hramrach@gmail.com> Acked-by: Maxime Ripard <maxime.ripard@free-electrons.com> Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'drivers/spi/spi-sun4i.c')
-rw-r--r--drivers/spi/spi-sun4i.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/spi/spi-sun4i.c b/drivers/spi/spi-sun4i.c
index 1ddd9e2309b6..07ce7c97750e 100644
--- a/drivers/spi/spi-sun4i.c
+++ b/drivers/spi/spi-sun4i.c
@@ -167,6 +167,11 @@ static void sun4i_spi_set_cs(struct spi_device *spi, bool enable)
sun4i_spi_write(sspi, SUN4I_CTL_REG, reg);
}
+static size_t sun4i_spi_max_transfer_size(struct spi_device *spi)
+{
+ return SUN4I_FIFO_DEPTH - 1;
+}
+
static int sun4i_spi_transfer_one(struct spi_master *master,
struct spi_device *spi,
struct spi_transfer *tfr)
@@ -394,6 +399,7 @@ static int sun4i_spi_probe(struct platform_device *pdev)
master->bits_per_word_mask = SPI_BPW_MASK(8);
master->dev.of_node = pdev->dev.of_node;
master->auto_runtime_pm = true;
+ master->max_transfer_size = sun4i_spi_max_transfer_size;
sspi->hclk = devm_clk_get(&pdev->dev, "ahb");
if (IS_ERR(sspi->hclk)) {