From: Sowjanya Komatineni <skomatineni@nvidia.com>
Date: Fri, 5 Apr 2019 00:14:01 +0000 (-0700)
Subject: spi: tegra114: use unpacked mode for below 4 bytes
X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=76457eea24db3c7d51f623c08838bbffda6ac3ad;p=openwrt%2Fstaging%2Fblogic.git

spi: tegra114: use unpacked mode for below 4 bytes

Packed mode expects minimum transfer length of 4 bytes.

This patch fixes this by using unpacked mode for transfers less
than 4 bytes.

Signed-off-by: Sowjanya Komatineni <skomatineni@nvidia.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
---

diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c
index c2ebf1ae632d..ea67ff3b5b2c 100644
--- a/drivers/spi/spi-tegra114.c
+++ b/drivers/spi/spi-tegra114.c
@@ -259,7 +259,8 @@ static unsigned tegra_spi_calculate_curr_xfer_param(
 
 	tspi->bytes_per_word = DIV_ROUND_UP(bits_per_word, 8);
 
-	if (bits_per_word == 8 || bits_per_word == 16 || bits_per_word == 32) {
+	if ((bits_per_word == 8 || bits_per_word == 16 ||
+	     bits_per_word == 32) && t->len > 3) {
 		tspi->is_packed = 1;
 		tspi->words_per_32bit = 32/bits_per_word;
 	} else {