From mboxrd@z Thu Jan 1 00:00:00 1970 From: Sowjanya Komatineni Subject: [PATCH V2 02/20] spi: tegra114: use unpacked mode for below 4 bytes Date: Thu, 4 Apr 2019 17:14:01 -0700 Message-ID: <1554423259-26056-2-git-send-email-skomatineni@nvidia.com> References: <1554423259-26056-1-git-send-email-skomatineni@nvidia.com> Mime-Version: 1.0 Content-Type: text/plain Return-path: In-Reply-To: <1554423259-26056-1-git-send-email-skomatineni@nvidia.com> Sender: linux-kernel-owner@vger.kernel.org To: thierry.reding@gmail.com, jonathanh@nvidia.com, talho@nvidia.com, skomatineni@nvidia.com, broonie@kernel.org, robh+dt@kernel.org, mark.rutland@arm.com, kyarlagadda@nvidia.com Cc: ldewangan@nvidia.com, linux-tegra@vger.kernel.org, linux-kernel@vger.kernel.org, linux-spi@vger.kernel.org, devicetree@vger.kernel.org List-Id: devicetree@vger.kernel.org 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 --- drivers/spi/spi-tegra114.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-tegra114.c b/drivers/spi/spi-tegra114.c index ba1639310282..3042521c3785 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 { -- 2.7.4