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Commit 5185a81c authored by Brian Norris's avatar Brian Norris Committed by Mark Brown
Browse files

spi: rockchip: limit transfers to (64K - 1) bytes 



The Rockchip SPI controller's length register only supports 16-bits,
yielding a maximum length of 64KiB (the CTRLR1 register holds "length -
1"). Trying to transfer more than that (e.g., with a large SPI flash
read) will cause the driver to hang.

Now, it seems that while theoretically we should be able to program
CTRLR1 with 0xffff, and get a 64KiB transfer, but that also seems to
cause the core to choke, so stick with a maximum of 64K - 1 bytes --
i.e., 0xffff.

Signed-off-by: default avatarBrian Norris <briannorris@chromium.org>
Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent 1a695a90

drivers/spi/spi-rockchip.c

+17 −0
Original line number Diff line number Diff line
@@ -142,6 +142,12 @@ 
/* sclk_out: spi master internal logic in rk3x can support 50Mhz */

#define MAX_SCLK_OUT		50000000



/*

 * SPI_CTRLR1 is 16-bits, so we should support lengths of 0xffff + 1. However,

 * the controller seems to hang when given 0x10000, so stick with this for now.

 */

#define ROCKCHIP_SPI_MAX_TRANLEN		0xffff



enum rockchip_ssi_type {

	SSI_MOTO_SPI = 0,

	SSI_TI_SSP,
@@ -573,6 +579,11 @@ static void rockchip_spi_config(struct rockchip_spi *rs) 
	dev_dbg(rs->dev, "cr0 0x%x, div %d\n", cr0, div);

}



static size_t rockchip_spi_max_transfer_size(struct spi_device *spi)

{

	return ROCKCHIP_SPI_MAX_TRANLEN;

}



static int rockchip_spi_transfer_one(

		struct spi_master *master,

		struct spi_device *spi,
@@ -589,6 +600,11 @@ static int rockchip_spi_transfer_one( 
		return -EINVAL;

	}



	if (xfer->len > ROCKCHIP_SPI_MAX_TRANLEN) {

		dev_err(rs->dev, "Transfer is too long (%d)\n", xfer->len);

		return -EINVAL;

	}



	rs->speed = xfer->speed_hz;

	rs->bpw = xfer->bits_per_word;

	rs->n_bytes = rs->bpw >> 3;
@@ -728,6 +744,7 @@ static int rockchip_spi_probe(struct platform_device *pdev) 
	master->prepare_message = rockchip_spi_prepare_message;

	master->unprepare_message = rockchip_spi_unprepare_message;

	master->transfer_one = rockchip_spi_transfer_one;

	master->max_transfer_size = rockchip_spi_max_transfer_size;

	master->handle_err = rockchip_spi_handle_err;



	rs->dma_tx.ch = dma_request_chan(rs->dev, "tx");