diff options
Diffstat (limited to 'drivers/spi/spi-mt65xx.c')
| -rw-r--r-- | drivers/spi/spi-mt65xx.c | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c index 976f73b9e299..7914255521c3 100644 --- a/drivers/spi/spi-mt65xx.c +++ b/drivers/spi/spi-mt65xx.c @@ -426,14 +426,15 @@ static int mtk_spi_fifo_transfer(struct spi_master *master, mtk_spi_prepare_transfer(master, xfer); mtk_spi_setup_packet(master); - cnt = xfer->len / 4; - iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt); - - remainder = xfer->len % 4; - if (remainder > 0) { - reg_val = 0; - memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder); - writel(reg_val, mdata->base + SPI_TX_DATA_REG); + if (xfer->tx_buf) { + cnt = xfer->len / 4; + iowrite32_rep(mdata->base + SPI_TX_DATA_REG, xfer->tx_buf, cnt); + remainder = xfer->len % 4; + if (remainder > 0) { + reg_val = 0; + memcpy(®_val, xfer->tx_buf + (cnt * 4), remainder); + writel(reg_val, mdata->base + SPI_TX_DATA_REG); + } } mtk_spi_enable_transfer(master); @@ -793,12 +794,6 @@ static int mtk_spi_probe(struct platform_device *pdev) pm_runtime_enable(&pdev->dev); - ret = devm_spi_register_master(&pdev->dev, master); - if (ret) { - dev_err(&pdev->dev, "failed to register master (%d)\n", ret); - goto err_disable_runtime_pm; - } - if (mdata->dev_comp->need_pad_sel) { if (mdata->pad_num != master->num_chipselect) { dev_err(&pdev->dev, @@ -838,6 +833,12 @@ static int mtk_spi_probe(struct platform_device *pdev) dev_notice(&pdev->dev, "SPI dma_set_mask(%d) failed, ret:%d\n", addr_bits, ret); + ret = devm_spi_register_master(&pdev->dev, master); + if (ret) { + dev_err(&pdev->dev, "failed to register master (%d)\n", ret); + goto err_disable_runtime_pm; + } + return 0; err_disable_runtime_pm: |