From mboxrd@z Thu Jan 1 00:00:00 1970 From: justinpopo6@gmail.com Subject: [PATCH] spi: bcm-qspi: when tx/rx buffer is NULL set to 0 Date: Thu, 7 Feb 2019 12:47:27 -0800 Message-ID: <1549572447-45456-1-git-send-email-justinpopo6@gmail.com> Cc: kdasu.kdev@gmail.com, bcm-kernel-feedback-list@broadcom.com, broonie@kernel.org, linux-kernel@vger.kernel.org, f.fainelli@gmail.com, Justin Chen To: linux-spi@vger.kernel.org Return-path: Sender: linux-kernel-owner@vger.kernel.org List-Id: linux-spi.vger.kernel.org From: Justin Chen Currently we set the tx/rx buffer to 0xff when NULL. This causes problems with some spi slaves where 0xff is a valid command. Looking at other drivers, the tx/rx buffer is usually set to 0x00 when NULL. Following this convention solves the issue. Fixes: fa236a7ef240 ("spi: bcm-qspi: Add Broadcom MSPI driver") Signed-off-by: Justin Chen --- drivers/spi/spi-bcm-qspi.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/spi/spi-bcm-qspi.c b/drivers/spi/spi-bcm-qspi.c index 584bcb0..79456aa 100644 --- a/drivers/spi/spi-bcm-qspi.c +++ b/drivers/spi/spi-bcm-qspi.c @@ -681,7 +681,7 @@ static void read_from_hw(struct bcm_qspi *qspi, int slots) if (buf) buf[tp.byte] = read_rxram_slot_u8(qspi, slot); dev_dbg(&qspi->pdev->dev, "RD %02x\n", - buf ? buf[tp.byte] : 0xff); + buf ? buf[tp.byte] : 0x00); } else { u16 *buf = tp.trans->rx_buf; @@ -689,7 +689,7 @@ static void read_from_hw(struct bcm_qspi *qspi, int slots) buf[tp.byte / 2] = read_rxram_slot_u16(qspi, slot); dev_dbg(&qspi->pdev->dev, "RD %04x\n", - buf ? buf[tp.byte] : 0xffff); + buf ? buf[tp.byte] : 0x0000); } update_qspi_trans_byte_count(qspi, &tp, @@ -744,13 +744,13 @@ static int write_to_hw(struct bcm_qspi *qspi, struct spi_device *spi) while (!tstatus && slot < MSPI_NUM_CDRAM) { if (tp.trans->bits_per_word <= 8) { const u8 *buf = tp.trans->tx_buf; - u8 val = buf ? buf[tp.byte] : 0xff; + u8 val = buf ? buf[tp.byte] : 0x00; write_txram_slot_u8(qspi, slot, val); dev_dbg(&qspi->pdev->dev, "WR %02x\n", val); } else { const u16 *buf = tp.trans->tx_buf; - u16 val = buf ? buf[tp.byte / 2] : 0xffff; + u16 val = buf ? buf[tp.byte / 2] : 0x0000; write_txram_slot_u16(qspi, slot, val); dev_dbg(&qspi->pdev->dev, "WR %04x\n", val); -- 2.7.4