diff mbox series

[2/3] PCI: Set AMD Renoir USB controller to D3 when shutdown

Message ID 20210225174041.405739-2-kai.heng.feng@canonical.com
State New
Headers show
Series [1/3] PCI: Introduce quirk hook after driver shutdown callback | expand

Commit Message

Kai-Heng Feng Feb. 25, 2021, 5:40 p.m. UTC 
From: Aaron Ma <aaron.ma@canonical.com>

On AMD Renoir/Cezanne platforms, when set "Always on USB" to "On" in BIOS,
USB controller will consume more power than 0.03w.

Set it to D3cold when shutdown, S5 power consumption will be 0.03w lower.
The USB can charge other devices as before.
USB controller works fine after power on and reboot.

Signed-off-by: Aaron Ma <aaron.ma@canonical.com>
Signed-off-by: Kai-Heng Feng <kai.heng.feng@canonical.com>
---
 drivers/pci/quirks.c | 8 ++++++++
 1 file changed, 8 insertions(+)
diff mbox series

Patch

diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 1f94fafc6920..0a848ef0b7db 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -28,6 +28,7 @@ 
 #include <linux/platform_data/x86/apple.h>
 #include <linux/pm_runtime.h>
 #include <linux/switchtec.h>
+#include <linux/kexec.h>
 #include <asm/dma.h>	/* isa_dma_bridge_buggy */
 #include "pci.h"
 
@@ -5619,3 +5620,10 @@  static void apex_pci_fixup_class(struct pci_dev *pdev)
 }
 DECLARE_PCI_FIXUP_CLASS_HEADER(0x1ac1, 0x089a,
 			       PCI_CLASS_NOT_DEFINED, 8, apex_pci_fixup_class);
+
+static void pci_fixup_shutdown_d3(struct pci_dev *pdev)
+{
+	if (!kexec_in_progress)
+		pci_set_power_state(pdev, PCI_D3cold);
+}
+DECLARE_PCI_FIXUP_SHUTDOWN(PCI_VENDOR_ID_AMD, 0x1639, pci_fixup_shutdown_d3);