xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

ravb: add wake-on-lan support via magic packet

Browse Source 
WoL is enabled in the suspend callback by setting MagicPacket detection
and disabling all interrupts expect MagicPacket. In the resume path the
driver needs to reset the hardware to rearm the WoL logic, this prevents
the driver from simply restoring the registers and to take advantage of
that ravb was not suspended to reduce resume time. To reset the
hardware the driver closes the device, sets it in reset mode and reopens
the device just like it would do in a normal suspend/resume scenario
without WoL enabled, but it both closes and opens the device in the
resume callback since the device needs to be reset for WoL to work.

One quirk needed for WoL is that the module clock needs to be prevented
from being switched off by Runtime PM. To keep the clock alive the
suspend callback need to call clk_enable() directly to increase the
usage count of the clock. Then when Runtime PM decreases the clock usage
count it won't reach 0 and be switched off.

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Acked-by: Sergei Shtylyov <sergei.shtylyov@cogentembedded.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Niklas Söderlund
2017-08-01 12:14:36 +02:00
committed by David S. Miller
parent 906a039d2f
commit 3e3d647715
2 changed files with 106 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/net/ethernet/renesas/ravb.h
View File

@@ -991,6 +991,7 @@ struct ravb_private {
struct net_device *ndev;
struct platform_device *pdev;
void __iomem *addr;
struct clk *clk;
struct mdiobb_ctrl mdiobb;
u32 num_rx_ring[NUM_RX_QUEUE];
u32 num_tx_ring[NUM_TX_QUEUE];
@@ -1033,6 +1034,7 @@ struct ravb_private {
unsigned no_avb_link:1;
unsigned avb_link_active_low:1;
unsigned wol_enabled:1;
};
static inline u32 ravb_read(struct net_device *ndev, enum ravb_reg reg)