spi: mt65xx: Add dma max segment size declaration

Add spi dma max segment size declaration according to spi
hardware capability, instead of 64KB by system default
setting, to improve bus bandwidth for mass data transmission.

Signed-off-by: zhichao.liu <zhichao.liu@mediatek.com>
Link: https://lore.kernel.org/r/20220927083248.25404-1-zhichao.liu@mediatek.com
Signed-off-by: Mark Brown <broonie@kernel.org>

diff --git a/drivers/spi/spi-mt65xx.c b/drivers/spi/spi-mt65xx.c
index 0a3b9f7eed30f1edf0dfc8868b453698908061c3..11aeae7fe7fc9fd59e7e40e0f1e3e162a1b54914 100644 (file)
--- a/drivers/spi/spi-mt65xx.c
+++ b/drivers/spi/spi-mt65xx.c
@@ -1184,6 +1184,11 @@ static int mtk_spi_probe(struct platform_device *pdev)
        if (!dev->dma_mask)
                dev->dma_mask = &dev->coherent_dma_mask;
 
+       if (mdata->dev_comp->ipm_design)
+               dma_set_max_seg_size(dev, SZ_16M);
+       else
+               dma_set_max_seg_size(dev, SZ_256K);
+
        ret = devm_request_irq(dev, irq, mtk_spi_interrupt,
                               IRQF_TRIGGER_NONE, dev_name(dev), master);
        if (ret)