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net: stmmac: fix disabling flexible PPS output 

Accordingly to Synopsys documentation [1] and [2], when bit PPSEN0
in register MAC_PPS_CONTROL is set it selects the functionality
command in the same register, otherwise selects the functionality
control.
Command functionality is required to either enable (command 0x2)
and disable (command 0x5) the flexible PPS output, but the bit
PPSEN0 is currently set only for enabling.

Set the bit PPSEN0 to properly disable flexible PPS output.

Tested on STM32MP15x, based on dwmac 4.10a.

[1] DWC Ethernet QoS Databook 4.10a October 2014
[2] DWC Ethernet QoS Databook 5.00a September 2017

Signed-off-by: Antonio Borneo <antonio.borneo@st.com>
Fixes: 9a8a02c9d4 ("net: stmmac: Add Flexible PPS support")
Signed-off-by: Jakub Kicinski <jakub.kicinski@netronome.com>
This commit is contained in:
Antonio Borneo 2019-10-07 17:43:05 +02:00 committed by Jakub Kicinski
parent 5da202c88f
commit 520cf60021
1 changed files with 1 additions and 0 deletions
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1
drivers/net/ethernet/stmicro/stmmac/dwmac5.c
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@ -515,6 +515,7 @@ int dwmac5_flex_pps_config(void __iomem *ioaddr, int index,
if (!enable) {
val |= PPSCMDx(index, 0x5);
val |= PPSEN0;
writel(val, ioaddr + MAC_PPS_CONTROL);
return 0;
}