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Commit 794912cf authored by Michal Suchanek's avatar Michal Suchanek Committed by Mark Brown
Browse files

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: default avatarMichal Suchanek <hramrach@gmail.com>
Acked-by: default avatarMaxime Ripard <maxime.ripard@free-electrons.com>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 1a695a90

drivers/spi/spi-sun4i.c

+6 −0
Original line number Diff line number Diff line
@@ -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)) {

drivers/spi/spi-sun6i.c

+5 −0
Original line number Diff line number Diff line
@@ -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)) {