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mmc: dw_mmc: exynos: increase DMA threshold value for exynos7870

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Exynos 7870 compatible controllers, such as SDIO ones are not able to
perform DMA transfers for small sizes of data (~16 to ~512 bytes),
resulting in cache issues in subsequent transfers. Increase the DMA
transfer threshold to 512 to allow the shorter transfers to take place,
bypassing DMA.

Signed-off-by: Kaustabh Chakraborty <kauschluss@disroot.org>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Kaustabh Chakraborty 2026-04-15 20:32:09 +05:30 committed by Ulf Hansson
parent 4bac6b89e3
commit 65c132fa8c
1 changed files with 1 additions and 0 deletions
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drivers/mmc/host/dw_mmc-exynos.c
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@ -141,6 +141,7 @@ static int dw_mci_exynos_priv_init(struct dw_mci *host)
priv->ctrl_type == DW_MCI_TYPE_EXYNOS7870_SMU) {
/* Quirk needed for certain Exynos SoCs */
host->quirks |= DW_MMC_QUIRK_FIFO64_32;
host->dma_threshold = 512;
}
if (priv->ctrl_type == DW_MCI_TYPE_ARTPEC8) {