summaryrefslogtreecommitdiff
path: root/src/drivers
diff options
context:
space:
mode:
authorKevin Chiu <Kevin.Chiu@quantatw.com>2018-08-03 18:52:18 +0800
committerMartin Roth <martinroth@google.com>2018-08-09 15:47:45 +0000
commit089b6857615a3bbf9c28b8e658da6b768650692f (patch)
tree948fa130c8730c3951228d0a2b261fa32436da4f /src/drivers
parentd87a9b8e67105b29e0f54b99e4322c4090a925c4 (diff)
downloadcoreboot-089b6857615a3bbf9c28b8e658da6b768650692f.tar.xz
google/grunt: Override BayHub EMMC driving strength
Careena EVT SanDisk EMMC sku has high fail rate of 0x5B reboot failure. It'll need to increase 1.8V EMMC CLK/CMD, Data driving strength for this issue. CLK[6:4] CMD,DATA[3:1] original register value: 0x6B enhanced: 0x7F BUG=b:111964336 BRANCH=master TEST=emerge-grunt coreboot Change-Id: I3db38ff12c566c258895c6643008a0472ca528bb Signed-off-by: Kevin Chiu <Kevin.Chiu@quantatw.com> Reviewed-on: https://review.coreboot.org/27816 Reviewed-by: Martin Roth <martinroth@google.com> Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net> Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src/drivers')
-rw-r--r--src/drivers/generic/bayhub/bh720.c27
-rw-r--r--src/drivers/generic/bayhub/bh720.h47
2 files changed, 53 insertions, 21 deletions
diff --git a/src/drivers/generic/bayhub/bh720.c b/src/drivers/generic/bayhub/bh720.c
index 3e78b4f049..b689b679d0 100644
--- a/src/drivers/generic/bayhub/bh720.c
+++ b/src/drivers/generic/bayhub/bh720.c
@@ -21,28 +21,11 @@
#include <device/pci.h>
#include <device/pci_ids.h>
#include "chip.h"
+#include "bh720.h"
-enum {
- BH720_PROTECT = 0xd0,
- BH720_PROTECT_LOCK_OFF = 0,
- BH720_PROTECT_LOCK_ON = BIT(0),
- BH720_PROTECT_OFF = 0,
- BH720_PROTECT_ON = BIT(31),
-
- BH720_LINK_CTRL = 0x90,
- BH720_LINK_CTRL_L0_ENABLE = BIT(0),
- BH720_LINK_CTRL_L1_ENABLE = BIT(1),
- BH720_LINK_CTRL_CLKREQ = BIT(8),
-
- BH720_MISC2 = 0xf0,
- BH720_MISC2_ASPM_DISABLE = BIT(0),
- BH720_MISC2_APSM_CLKREQ_L1 = BIT(7),
- BH720_MISC2_APSM_PHY_L1 = BIT(10),
- BH720_MISC2_APSM_MORE = BIT(12),
-
- BH720_RTD3_L1 = 0x3e0,
- BH720_RTD3_L1_DISABLE_L1 = BIT(28),
-};
+__attribute__((weak)) void bh720_driving_strength(struct device *dev)
+{
+}
static void bh720_init(struct device *dev)
{
@@ -71,6 +54,8 @@ static void bh720_init(struct device *dev)
printk(BIOS_INFO, "BayHub BH720: Power-saving enabled (link_ctrl=%#x)\n",
pci_read_config32(dev, BH720_LINK_CTRL));
}
+
+ bh720_driving_strength(dev);
}
static struct pci_operations pci_ops = {
diff --git a/src/drivers/generic/bayhub/bh720.h b/src/drivers/generic/bayhub/bh720.h
new file mode 100644
index 0000000000..b6fd2738cd
--- /dev/null
+++ b/src/drivers/generic/bayhub/bh720.h
@@ -0,0 +1,47 @@
+/*
+ * Driver for BayHub Technology BH720 PCI to eMMC 5.0 HS200 bridge
+ *
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2018 Google LLC.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+enum {
+ BH720_PROTECT = 0xd0,
+ BH720_PROTECT_LOCK_OFF = 0,
+ BH720_PROTECT_LOCK_ON = BIT(0),
+ BH720_PROTECT_OFF = 0,
+ BH720_PROTECT_ON = BIT(31),
+
+ BH720_LINK_CTRL = 0x90,
+ BH720_LINK_CTRL_L0_ENABLE = BIT(0),
+ BH720_LINK_CTRL_L1_ENABLE = BIT(1),
+ BH720_LINK_CTRL_CLKREQ = BIT(8),
+
+ BH720_MISC2 = 0xf0,
+ BH720_MISC2_ASPM_DISABLE = BIT(0),
+ BH720_MISC2_APSM_CLKREQ_L1 = BIT(7),
+ BH720_MISC2_APSM_PHY_L1 = BIT(10),
+ BH720_MISC2_APSM_MORE = BIT(12),
+
+ BH720_MEM_RW_DATA = 0x200,
+ BH720_MEM_RW_ADR = 0x204,
+ BH720_MEM_ACCESS_EN = 0x208,
+ BH720_PCR = 0x304,
+ BH720_PCR_DATA_CMD_DRV_MAX = 7,
+ BH720_PCR_CLK_DRV_MAX = 7,
+
+ BH720_RTD3_L1 = 0x3e0,
+ BH720_RTD3_L1_DISABLE_L1 = BIT(28),
+};
+
+void bh720_driving_strength(struct device *dev);