Unverified Commit 15a6af94 authored by Stefan Moring's avatar Stefan Moring Committed by Mark Brown
Browse files

spi: Increase imx51 ecspi burst length based on transfer length 



IMX51 supports 4096 bit burst lengths. Using the spi transfer length
instead of bits_per_word increases performance significantly.

Signed-off-by: default avatarStefan Moring <stefan.moring@technolution.nl>
Link: https://lore.kernel.org/r/20230628125406.237949-1-stefan.moring@technolution.nl


Signed-off-by: default avatarMark Brown <broonie@kernel.org>
parent fee68164

drivers/spi/spi-imx.c

+8 −3
Original line number Diff line number Diff line
@@ -659,9 +659,13 @@ static int mx51_ecspi_prepare_transfer(struct spi_imx_data *spi_imx, 
	if (spi_imx->slave_mode && is_imx53_ecspi(spi_imx))

		ctrl |= (spi_imx->slave_burst * 8 - 1)

			<< MX51_ECSPI_CTRL_BL_OFFSET;

	else {

		if (spi_imx->count >= 512)

			ctrl |= 0xFFF << MX51_ECSPI_CTRL_BL_OFFSET;

		else

		ctrl |= (spi_imx->bits_per_word - 1)

			ctrl |= (spi_imx->count*8 - 1)

				<< MX51_ECSPI_CTRL_BL_OFFSET;

	}



	/* set clock speed */

	ctrl &= ~(0xf << MX51_ECSPI_CTRL_POSTDIV_OFFSET |
@@ -1258,6 +1262,7 @@ static int spi_imx_setupxfer(struct spi_device *spi, 
		spi_imx->spi_bus_clk = t->speed_hz;



	spi_imx->bits_per_word = t->bits_per_word;

	spi_imx->count = t->len;



	/*

	 * Initialize the functions for transfer. To transfer non byte-aligned