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| author | Michal Suchanek <hramrach@gmail.com> | 2016-06-13 19:46:50 +0200 |
|---|---|---|
| committer | Mark Brown <broonie@kernel.org> | 2016-06-14 11:04:42 +0200 |
| commit | 794912cff6dba8b5e93948243299bb0b2cb11277 (patch) | |
| tree | ae2ee6e5e2a4dac0b8e98aea1697adc0fee73329 /drivers/spi/spi-sun6i.c | |
| parent | Linux 4.7-rc1 (diff) | |
| download | linux-794912cff6dba8b5e93948243299bb0b2cb11277.tar.xz linux-794912cff6dba8b5e93948243299bb0b2cb11277.zip | |
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-sun6i.c')
| -rw-r--r-- | drivers/spi/spi-sun6i.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/spi/spi-sun6i.c b/drivers/spi/spi-sun6i.c index 42e2c4bd690a..6fa6ff12ae61 100644 --- a/drivers/spi/spi-sun6i.c +++ b/drivers/spi/spi-sun6i.c @@ -153,6 +153,10 @@ static void sun6i_spi_set_cs(struct spi_device *spi, bool enable) sun6i_spi_write(sspi, SUN6I_TFR_CTL_REG, reg); } +static size_t sun6i_spi_max_transfer_size(struct spi_device *spi) +{ + return SUN6I_FIFO_DEPTH - 1; +} static int sun6i_spi_transfer_one(struct spi_master *master, struct spi_device *spi, @@ -393,6 +397,7 @@ static int sun6i_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 = sun6i_spi_max_transfer_size; sspi->hclk = devm_clk_get(&pdev->dev, "ahb"); if (IS_ERR(sspi->hclk)) { |