On 26-02-18 12:30, Sebastian Gottschall wrote:
Am 26.02.2018 um 11:07 schrieb Bas Vermeulen:
On 26-02-18 10:54, Kalle Valo wrote:
Bas Vermeulen <bvermeul@xxxxxxxxxxxx> writes:
A random (little endian eeprom'd) ar9278 card didn't work on my
PowerMac G5 without allowing the driver to byte-swap the eeprom.
Introduce a module parameter endian_check to allow this to happen,
and the PCIe card to function correctly on BE powerpc.
Signed-off-by: Bas Vermeulen <bvermeul@xxxxxxxxxxxx>
---
drivers/net/wireless/ath/ath9k/init.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/ath/ath9k/init.c
b/drivers/net/wireless/ath/ath9k/init.c
index fa58a32227f5..421039dc060a 100644
--- a/drivers/net/wireless/ath/ath9k/init.c
+++ b/drivers/net/wireless/ath/ath9k/init.c
@@ -67,6 +67,9 @@ static int ath9k_ps_enable;
module_param_named(ps_enable, ath9k_ps_enable, int, 0444);
MODULE_PARM_DESC(ps_enable, "Enable WLAN PowerSave");
+static int ath9k_endian_check;
+module_param_named(endian_check, ath9k_endian_check, int, 0444);
+MODULE_PARM_DESC(endian_check, "Check EEPROM for endianness
compatibility");
#ifdef CONFIG_ATH9K_CHANNEL_CONTEXT
int ath9k_use_chanctx;
@@ -587,7 +590,8 @@ static int ath9k_of_init(struct ath_softc *sc)
ether_addr_copy(common->macaddr, mac);
ah->ah_flags &= ~AH_USE_EEPROM;
- ah->ah_flags |= AH_NO_EEP_SWAP;
+ if (!ath9k_endian_check)
+ ah->ah_flags |= AH_NO_EEP_SWAP;
A bit annoying to have a module parameter, isn't there any automatic
way
to detect/try this? But on the other hand I guess this isn't a common
problem as nobody has reported this before?
There is an automatic way to detect this, but that is disabled by the
AH_NO_EEP_SWAP flag.
The platform initialisation does not set this flag if the
endian_check member of pdata is set
to true, but there is no way to not set this when using a device
tree. I used a module
parameter instead of a device tree variable because I don't know of a
way to modify the
device tree my PowerMac boots with.
have you tried to compile it without device tree support? since its
just a pcie card, i dont think that devicetree is required here
it should run fine without it.
The driver will still set AH_NO_EEP_SWAP regardless, and will still not
swap the eeprom from
little endian to big endian on big endian machines. See
drivers/net/wireless/ath/ath9k/eeprom.c:188
and drivers/net/wireless/ath/ath9k/init.c (lines 593 and 645).
The reason I'm talking about device trees here is because I could have
used a device tree parameter
instead of a module parameter.
Bas Vermeulen
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