spi: tegra210-quad: Don't initialise DMA if not supported

The following error messages are observed on boot for Tegra234 ...

 ERR KERN tegra-qspi 3270000.spi: cannot use DMA: -19
 ERR KERN tegra-qspi 3270000.spi: falling back to PIO

Tegra234 does not support DMA for the QSPI and so initialising the DMA
is expected to fail. The above error messages are misleading for devices
that don't support DMA and so fix this by skipping the DMA
initialisation for devices that don't support DMA.

Signed-off-by: Jon Hunter <jonathanh@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Link: https://lore.kernel.org/r/20221026155633.141792-1-jonathanh@nvidia.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-tegra210-quad.c b/drivers/spi/spi-tegra210-quad.c
index 904972606bd45bb99a960b028ec5aef4c335c706..10f0c5a6e0dce44ef26221b703b8e7db87f22d03 100644 (file)
--- a/drivers/spi/spi-tegra210-quad.c
+++ b/drivers/spi/spi-tegra210-quad.c
@@ -720,6 +720,9 @@ static int tegra_qspi_start_cpu_based_transfer(struct tegra_qspi *qspi, struct s
 
 static void tegra_qspi_deinit_dma(struct tegra_qspi *tqspi)
 {
+       if (!tqspi->soc_data->has_dma)
+               return;
+
        if (tqspi->tx_dma_buf) {
                dma_free_coherent(tqspi->dev, tqspi->dma_buf_size,
                                  tqspi->tx_dma_buf, tqspi->tx_dma_phys);
@@ -750,6 +753,9 @@ static int tegra_qspi_init_dma(struct tegra_qspi *tqspi)
        u32 *dma_buf;
        int err;
 
+       if (!tqspi->soc_data->has_dma)
+               return 0;
+
        dma_chan = dma_request_chan(tqspi->dev, "rx");
        if (IS_ERR(dma_chan)) {
                err = PTR_ERR(dma_chan);