5.15-stable review patch. If anyone has any objections, please let me know.
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From: Bernd Edlinger bernd.edlinger@hotmail.de
[ Upstream commit a5f5eee282a0aae80227697e1d9c811b1726d31d ]
otherwise the synopsys_id value may be read out wrong, because the GMAC_VERSION register might still be in reset state, for at least 1 us after the reset is de-asserted.
Add a wait for 10 us before continuing to be on the safe side.
From what have you got that delay value?
Just try and error, with very old linux versions and old gcc versions the synopsys_id was read out correctly most of the time (but not always), with recent linux versions and recnet gcc versions it was read out wrongly most of the time, but again not always. I don't have access to the VHDL code in question, so I cannot tell why it takes so long to get the correct values, I also do not have more than a few hardware samples, so I cannot tell how long this timeout must be in worst case. Experimentally I can tell that the register is read several times as zero immediately after the reset is de-asserted, also adding several no-ops is not enough, adding a printk is enough, also udelay(1) seems to be enough but I tried that not very often, and I have not access to many hardware samples to be 100% sure about the necessary delay. And since the udelay here is only executed once per device instance, it seems acceptable to delay the boot for 10 us.
BTW: my hardware's synopsys id is 0x37.
Fixes: c5e4ddbdfa11 ("net: stmmac: Add support for optional reset control") Signed-off-by: Bernd Edlinger bernd.edlinger@hotmail.de Reviewed-by: Jiri Pirko jiri@nvidia.com Reviewed-by: Serge Semin fancer.lancer@gmail.com Link: https://lore.kernel.org/r/AS8P193MB1285A810BD78C111E7F6AA34E4752@AS8P193MB12... Signed-off-by: Jakub Kicinski kuba@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c index ede630bfad2f..ab3ded6e0e6a 100644 --- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c +++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c @@ -7096,6 +7096,9 @@ int stmmac_dvr_probe(struct device *device, dev_err(priv->device, "unable to bring out of ahb reset: %pe\n", ERR_PTR(ret));
+ /* Wait a bit for the reset to take effect */ + udelay(10); + /* Init MAC and get the capabilities */ ret = stmmac_hw_init(priv); if (ret)