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authorAaron Durbin <adurbin@chromium.org>2020-07-02 11:03:44 -0600
committerAaron Durbin <adurbin@chromium.org>2020-07-03 15:35:44 +0000
commitd3758540a951510ede21ebb76cbc196ae8ed0e68 (patch)
tree0365a46074796f97c72cfb58a83d691ea64b8e07 /src/soc/amd/common/block
parentb798deb1d5cf6f5015a224a119a6241b45f36873 (diff)
downloadcoreboot-d3758540a951510ede21ebb76cbc196ae8ed0e68.tar.xz
soc/amd/common: fix eSPI virtual wire polarity encoding
eSPI interrupts are active level high. The eSPI polarity register in the chipset inverts incoming signals if the corresonding bit is 0 in the register. Therefore, all active high (edge or level) virtual wire interrupts need to ensure they are not inverted. And really the sender of the interrupts should be conforming to the the eSPI spec. As such inverting any signals should not be necessary, but this register in the chipset allows for fixing up those misbehaviors. BUG=b:157984427 Signed-off-by: Aaron Durbin <adurbin@chromium.org> Change-Id: I7346bb0484506d96d7ab2e6d046ffa0571683a48 Reviewed-on: https://review.coreboot.org/c/coreboot/+/43010 Tested-by: build bot (Jenkins) <no-reply@coreboot.org> Reviewed-by: Furquan Shaikh <furquan@google.com>
Diffstat (limited to 'src/soc/amd/common/block')
-rw-r--r--src/soc/amd/common/block/include/amdblocks/espi.h13
1 files changed, 5 insertions, 8 deletions
diff --git a/src/soc/amd/common/block/include/amdblocks/espi.h b/src/soc/amd/common/block/include/amdblocks/espi.h
index e882af0305..2bfef890cc 100644
--- a/src/soc/amd/common/block/include/amdblocks/espi.h
+++ b/src/soc/amd/common/block/include/amdblocks/espi.h
@@ -43,14 +43,11 @@
#define ESPI_OOB_CH_EN (1 << 1)
#define ESPI_FLASH_CH_EN (1 << 0)
-/*
- * Virtual wire interrupt polarity. If the interrupt is active level high or active falling
- * edge, then controller expects its bit to be cleared in ESPI_RXVW_POLARITY whereas if the
- * interrupt is active level low or active rising edge, then its bit needs to be set in
- * ESPI_RXVW_POLARITY.
- */
-#define ESPI_VW_IRQ_LEVEL_HIGH(x) (0 << (x))
-#define ESPI_VW_IRQ_LEVEL_LOW(x) (1 << (x))
+/* Virtual wire interrupt polarity. eSPI interrupts are active level high signals. The
+ polarity register inverts the incoming signal if the associated bit with the irq is
+ 0. */
+#define ESPI_VW_IRQ_LEVEL_HIGH(x) (1 << (x))
+#define ESPI_VW_IRQ_LEVEL_LOW(x) (0 << (x))
#define ESPI_VW_IRQ_EDGE_HIGH(x) (1 << (x))
#define ESPI_VW_IRQ_EDGE_LOW(x) (0 << (x))