google/snappy: Override USB2 strength by SKUID

14" BigDaddy needs to override USB2 TxiSet additionally to
enhance driving strength.

Otherwise EA test will fail on USB2 eye pattern.

BUG=b:67820719
BRANCH=reef
TEST=emerge-snappy coreboot
Change-Id: I674c121a71866a5d44439eeb49e07f917d816de8
Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com>
Reviewed-on: https://review.coreboot.org/22037
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Aaron Durbin <adurbin@chromium.org>

1 files changed, 37 insertions, 0 deletions

diff --git a/src/mainboard/google/reef/variants/snappy/mainboard.c b/src/mainboard/google/reef/variants/snappy/mainboard.c
index 2767df245e..ac76a88a98 100644
--- a/src/mainboard/google/reef/variants/snappy/mainboard.c
+++ b/src/mainboard/google/reef/variants/snappy/mainboard.c
@@ -17,6 +17,22 @@
 #include <baseboard/variants.h>
 #include <ec/google/chromeec/ec.h>
 #include <vendorcode/google/chromeos/cros_vpd.h>
+#include <soc/cpu.h>
+#include <soc/intel/apollolake/chip.h>
+
+/* SKU ID enumeration */
+enum snappy_sku {
+	SKU_UNKNOWN = -1,
+	SKU_RESERVED0,
+	SKU_RESERVED1,
+	SKU_BIGDADDY_KBDBKLIGHT,
+	SKU_RESERVED3,
+	SKU_RESERVED4,
+	SKU_BIGDADDY,
+	SKU_RESERVED6,
+	SKU_ALAN,
+	SKU_SNAPPY,
+};
 
 void variant_board_ec_set_skuid(void)
 {
@@ -63,3 +79,24 @@ uint8_t variant_board_sku(void)
 
 	return board_sku_num;
 }
+
+void mainboard_devtree_update(struct device *dev)
+{
+	/* Override dev tree settings per board */
+	struct soc_intel_apollolake_config *cfg = dev->chip_info;
+	uint8_t sku_id;
+
+	sku_id = variant_board_sku();
+
+	switch (sku_id) {
+	case SKU_BIGDADDY_KBDBKLIGHT:
+	case SKU_BIGDADDY:
+		cfg->usb2eye[1].Usb20PerPortPeTxiSet = 7;
+		cfg->usb2eye[1].Usb20PerPortTxiSet = 7;
+		cfg->usb2eye[1].Usb20IUsbTxEmphasisEn = 3;
+		cfg->usb2eye[1].Usb20PerPortTxPeHalf = 0;
+		break;
+	default:
+		break;
+	}
+}