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spi: sunxi: expose maximum transfer size limit

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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>
This commit is contained in:
Michal Suchanek 2016-06-13 17:46:50 +00:00 committed by Mark Brown
parent 1a695a905c
commit 794912cff6
2 changed files with 11 additions and 0 deletions
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6
drivers/spi/spi-sun4i.c
View file

@ -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)) {

5
drivers/spi/spi-sun6i.c
View file

@ -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)) {