[coreboot-gerrit] Change in coreboot[master]: soc/amd/common/block/lpc/spi_dma: Yield after completing transaction

[Raul Rangel (Code Review)]

Attention is currently required from: Jason Glenesk, Marshall Dawson, Felix Held.
Raul Rangel has uploaded this change for review. ( https://review.coreboot.org/c/coreboot/+/56321 )

Change subject: soc/amd/common/block/lpc/spi_dma: Yield after completing transaction
......................................................................

soc/amd/common/block/lpc/spi_dma: Yield after completing transaction

There is no telling when the next udelay will be, so explicitly call it
after completing a transaction. This will allow any pending transactions
to immediately start.

BUG=b:179699789
TEST=Verify new transaction is enqueued right after another.

Signed-off-by: Raul E Rangel 
Change-Id: I9c1272bde46c3e0c15305b76c2ea7a6dde5ed0b0
---
M src/soc/amd/common/block/lpc/spi_dma.c
1 file changed, 3 insertions(+), 0 deletions(-)

git pull ssh://review.coreboot.org:29418/coreboot refs/changes/21/56321/1

diff --git a/src/soc/amd/common/block/lpc/spi_dma.c b/src/soc/amd/common/block/lpc/spi_dma.c
index 36f139a..00cd593 100644
--- a/src/soc/amd/common/block/lpc/spi_dma.c
+++ b/src/soc/amd/common/block/lpc/spi_dma.c
@@ -183,6 +183,9 @@
    printk(BIOS_SPEW, "%s: end: dest: %p, source: %#zx, remaining: %zu\n",
           __func__, destination, source, transaction.remaining);

+	/* Yield to allow any queued up transactions to continue */
+	udelay(0);
+
    return transaction.size - transaction.remaining;
 }