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 0a3b9f7..11aeae7 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)