rockchip: spi: only wait for completion, if transmitting

[platform/kernel/u-boot.git] / drivers / spi / rk_spi.c

diff --git a/drivers/spi/rk_spi.c b/drivers/spi/rk_spi.c
index aaf244d..c807d78 100644 (file)
--- a/drivers/spi/rk_spi.c
+++ b/drivers/spi/rk_spi.c
@@ -379,9 +379,18 @@ static int rockchip_spi_xfer(struct udevice *dev, unsigned int bitlen,
                                toread--;
                        }
                }
-               ret = rkspi_wait_till_not_busy(regs);
-               if (ret)
-                       break;
+
+               /*
+                * In case that there's a transmit-component, we need to wait
+                * until the control goes idle before we can disable the SPI
+                * control logic (as this will implictly flush the FIFOs).
+                */
+               if (out) {
+                       ret = rkspi_wait_till_not_busy(regs);
+                       if (ret)
+                               break;
+               }
+
                len -= todo;
        }