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| author | Qiuxu Zhuo <qiuxu.zhuo@intel.com> | 2017-08-14 23:49:05 +0800 |
|---|---|---|
| committer | Borislav Petkov <bp@suse.de> | 2017-08-19 10:51:11 +0200 |
| commit | bc8f10babcc27c1f4d8e80d91cc543eabf9125c4 (patch) | |
| tree | 797a999e317d6ba1b1b99f8fd29e5b86d43d4104 /drivers/edac | |
| parent | 5fd77cb3bac77f690d1d9cf57dc7851fcb3e7945 (diff) | |
| download | linux-bc8f10babcc27c1f4d8e80d91cc543eabf9125c4.tar.gz | |
EDAC, pnd2: Properly toggle hidden state for P2SB PCI device
Properly handle hidden state of P2SB PCI device (DEV:D, FUN:0) for Apollo Lake. Signed-off-by: Qiuxu Zhuo <qiuxu.zhuo@intel.com> Cc: Tony Luck <tony.luck@intel.com> Cc: linux-edac <linux-edac@vger.kernel.org> Link: http://lkml.kernel.org/r/20170814154905.21707-1-qiuxu.zhuo@intel.com Signed-off-by: Borislav Petkov <bp@suse.de>
Diffstat (limited to 'drivers/edac')
| -rw-r--r-- | drivers/edac/pnd2_edac.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c index 89cdd9a7a733..4395c84cdcbf 100644 --- a/drivers/edac/pnd2_edac.c +++ b/drivers/edac/pnd2_edac.c @@ -161,8 +161,12 @@ static int _apl_rd_reg(int port, int off, int op, u32 *data) { int retries = 0xff, ret; u16 status; + u8 hidden; - P2SB_WRITE(byte, P2SB_HIDE_OFF, 0); + /* Unhide the P2SB device, if it's hidden */ + P2SB_READ(byte, P2SB_HIDE_OFF, &hidden); + if (hidden) + P2SB_WRITE(byte, P2SB_HIDE_OFF, 0); if (p2sb_is_busy(&status)) { ret = -EAGAIN; @@ -185,7 +189,9 @@ static int _apl_rd_reg(int port, int off, int op, u32 *data) P2SB_READ(dword, P2SB_DATA_OFF, data); ret = (status >> 1) & 0x3; out: - P2SB_WRITE(byte, P2SB_HIDE_OFF, 1); + /* Hide the P2SB device, if it was hidden before */ + if (hidden) + P2SB_WRITE(byte, P2SB_HIDE_OFF, hidden); return ret; } |