Commit 3e7f3356 authored by Mark A. Greer's avatar Mark A. Greer Committed by Samuel Ortiz
Browse files

NFC: trf7970a: Use spi_sync() instead of spi_write_then_read() 



To more efficiently handle long continuous reads,
use spi_sync() instead of spi_write_then_read().

Signed-off-by: default avatarMark A. Greer <mgreer@animalcreek.com>
Signed-off-by: default avatarSamuel Ortiz <sameo@linux.intel.com>
parent 24707296

drivers/nfc/trf7970a.c

+16 −3
Original line number Diff line number Diff line
@@ -393,15 +393,28 @@ static int trf7970a_read(struct trf7970a *trf, u8 reg, u8 *val) 
	return ret;

}



static int trf7970a_read_cont(struct trf7970a *trf, u8 reg,

		u8 *buf, size_t len)

static int trf7970a_read_cont(struct trf7970a *trf, u8 reg, u8 *buf, size_t len)

{

	u8 addr = reg | TRF7970A_CMD_BIT_RW | TRF7970A_CMD_BIT_CONTINUOUS;

	struct spi_transfer t[2];

	struct spi_message m;

	int ret;



	dev_dbg(trf->dev, "read_cont(0x%x, %zd)\n", addr, len);



	ret = spi_write_then_read(trf->spi, &addr, 1, buf, len);

	spi_message_init(&m);



	memset(&t, 0, sizeof(t));



	t[0].tx_buf = &addr;

	t[0].len = sizeof(addr);

	spi_message_add_tail(&t[0], &m);



	t[1].rx_buf = buf;

	t[1].len = len;

	spi_message_add_tail(&t[1], &m);



	ret = spi_sync(trf->spi, &m);

	if (ret)

		dev_err(trf->dev, "%s - addr: 0x%x, ret: %d\n", __func__, addr,

				ret);