x86: ich-spi: Clear atomic preop only when SPI settings are not locked

The atomic preop register can only be written when SPI settings are
not locked, otherwise it's read-only.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Stefan Roese <sr@denx.de>

diff --git a/drivers/spi/ich.c b/drivers/spi/ich.c
index 5a3d6908152b0d653d462e39354b4a4607d28413..22fc83dd725d2154890f048234dc83994f4c1c99 100644 (file)
--- a/drivers/spi/ich.c
+++ b/drivers/spi/ich.c
@@ -563,7 +563,8 @@ static int ich_spi_xfer(struct udevice *dev, unsigned int bitlen,
        }
 
        /* Clear atomic preop now that xfer is done */
-       ich_writew(ctlr, 0, ctlr->preop);
+       if (!lock)
+               ich_writew(ctlr, 0, ctlr->preop);
 
        return 0;
 }