diff options
| author | Emmanuel Grumbach <emmanuel.grumbach@intel.com> | 2013-12-24 14:15:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2014-02-06 11:22:16 -0800 |
| commit | 0880e59a45b2ac82dbaaf0cbed9075ae5ce134bf (patch) | |
| tree | 695bb4faa03c28c5ee10c5138f91ac0fa00e4346 /drivers | |
| parent | 67d98b4f53e5509e912be53046088f332d6734e1 (diff) | |
| download | lwn-0880e59a45b2ac82dbaaf0cbed9075ae5ce134bf.tar.gz lwn-0880e59a45b2ac82dbaaf0cbed9075ae5ce134bf.zip | |
iwlwifi: pcie: enable oscillator for L1 exit
commit 2d93aee152b1758a94a18fe15d72153ba73b5679 upstream.
Enabling the oscillator consumes slightly more power (100uA)
but allows to make sure that we exit from L1 on time.
Not doing so might lead to a PCIe specification violation
since we might wake up from L1 at the wrong time.
This issue has been identified on 3160 and 7260 only.
On older NICs L1 off is not enabled, on newer NICs (7265),
the issue is fixed.
When the bug occurs the user sees that the NIC has
disappeared from the PCI bridge, any access to the device
returns 0xff.
This fixes:
https://bugzilla.kernel.org/show_bug.cgi?id=64541
and has been extensively discussed here:
http://markmail.org/thread/mfmpzqt3r333n4bo
Fixes: 99cd47142399 ("iwlwifi: add 7000 series device configuration")
Reported-and-tested-by: wzyboy <wzyboy@wzyboy.org>
Reviewed-by: Johannes Berg <johannes.berg@intel.com>
Signed-off-by: Emmanuel Grumbach <emmanuel.grumbach@intel.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/net/wireless/iwlwifi/iwl-prph.h | 4 | ||||
| -rw-r--r-- | drivers/net/wireless/iwlwifi/pcie/trans.c | 22 |
2 files changed, 26 insertions, 0 deletions
diff --git a/drivers/net/wireless/iwlwifi/iwl-prph.h b/drivers/net/wireless/iwlwifi/iwl-prph.h index ff8cc75c189d..4e6dfbafc2a1 100644 --- a/drivers/net/wireless/iwlwifi/iwl-prph.h +++ b/drivers/net/wireless/iwlwifi/iwl-prph.h @@ -272,4 +272,8 @@ static inline unsigned int SCD_QUEUE_STATUS_BITS(unsigned int chnl) /*********************** END TX SCHEDULER *************************************/ +/* Oscillator clock */ +#define OSC_CLK (0xa04068) +#define OSC_CLK_FORCE_CONTROL (0x8) + #endif /* __iwl_prph_h__ */ diff --git a/drivers/net/wireless/iwlwifi/pcie/trans.c b/drivers/net/wireless/iwlwifi/pcie/trans.c index 6bc31003a32c..7bdaf06b8f5a 100644 --- a/drivers/net/wireless/iwlwifi/pcie/trans.c +++ b/drivers/net/wireless/iwlwifi/pcie/trans.c @@ -206,6 +206,28 @@ static int iwl_pcie_apm_init(struct iwl_trans *trans) goto out; } + if (trans->cfg->host_interrupt_operation_mode) { + /* + * This is a bit of an abuse - This is needed for 7260 / 3160 + * only check host_interrupt_operation_mode even if this is + * not related to host_interrupt_operation_mode. + * + * Enable the oscillator to count wake up time for L1 exit. This + * consumes slightly more power (100uA) - but allows to be sure + * that we wake up from L1 on time. + * + * This looks weird: read twice the same register, discard the + * value, set a bit, and yet again, read that same register + * just to discard the value. But that's the way the hardware + * seems to like it. + */ + iwl_read_prph(trans, OSC_CLK); + iwl_read_prph(trans, OSC_CLK); + iwl_set_bits_prph(trans, OSC_CLK, OSC_CLK_FORCE_CONTROL); + iwl_read_prph(trans, OSC_CLK); + iwl_read_prph(trans, OSC_CLK); + } + /* * Enable DMA clock and wait for it to stabilize. * |