dw_mmc: Calculate dwmmc FIFO threshold size if not provided

We can calculate this. Add code to do this if it is not provided.

panto: prefix changed to dw_mmc to make things easier to grep

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Jaehoon Chung <jh80.chung@samsung.com>

diff --git a/drivers/mmc/dw_mmc.c b/drivers/mmc/dw_mmc.c
index d34e4ee9dde19e43a7ba739a83f322b36d91ec60..77b87e0365be110beef432eb608d375fa2dc51b1 100644 (file)
--- a/drivers/mmc/dw_mmc.c
+++ b/drivers/mmc/dw_mmc.c
@@ -373,9 +373,15 @@ static int dwmci_init(struct mmc *mmc)
        dwmci_writel(host, DWMCI_IDINTEN, 0);
        dwmci_writel(host, DWMCI_BMOD, 1);
 
-       if (host->fifoth_val) {
-               dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
+       if (!host->fifoth_val) {
+               uint32_t fifo_size;
+
+               fifo_size = dwmci_readl(host, DWMCI_FIFOTH);
+               fifo_size = ((fifo_size & RX_WMARK_MASK) >> RX_WMARK_SHIFT) + 1;
+               host->fifoth_val = MSIZE(0x2) | RX_WMARK(fifo_size / 2 - 1) |
+                               TX_WMARK(fifo_size / 2);
        }
+       dwmci_writel(host, DWMCI_FIFOTH, host->fifoth_val);
 
        dwmci_writel(host, DWMCI_CLKENA, 0);
        dwmci_writel(host, DWMCI_CLKSRC, 0);