* EDAC, pnd2_edac: Fix Apollo Lake DIMM detection
@ 2017-06-28 23:44 Luck, Tony
0 siblings, 0 replies; 2+ messages in thread
From: Luck, Tony @ 2017-06-28 23:44 UTC (permalink / raw)
To: Borislav Petkov
Cc: Tony Luck, Qiuxu Zhuo, Mauro Carvalho Chehab, open list:EDAC-PND2
From: Tony Luck <tony.luck@intel.com>
Non-existent or empty DIMM slots result in error return from
RD_REGP(). But we shouldn't give up on failure.
So long as we find at least one DIMM we can continue.
Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
Cc: Mauro Carvalho Chehab <mchehab@kernel.org> (supporter:EDAC-CORE)
Cc: linux-edac@vger.kernel.org (open list:EDAC-PND2)
Signed-off-by: Tony Luck <tony.luck@intel.com>
---
drivers/edac/pnd2_edac.c | 11 ++++++++---
1 file changed, 8 insertions(+), 3 deletions(-)
diff --git a/drivers/edac/pnd2_edac.c b/drivers/edac/pnd2_edac.c
index 1cad5a9af8d0..8b287bf3e2ec 100644
--- a/drivers/edac/pnd2_edac.c
+++ b/drivers/edac/pnd2_edac.c
@@ -423,16 +423,21 @@ static void dnv_mk_region(char *name, struct region *rp, void *asym)
static int apl_get_registers(void)
{
+ int ret = -ENODEV;
int i;
if (RD_REG(&asym_2way, b_cr_asym_2way_mem_region_mchbar))
return -ENODEV;
+ /*
+ * RD_REGP() will fail for unpopulated or non-existent
+ * DIMM slots. Return success if we find at least one DIMM.
+ */
for (i = 0; i < APL_NUM_CHANNELS; i++)
- if (RD_REGP(&drp0[i], d_cr_drp0, apl_dports[i]))
- return -ENODEV;
+ if (!RD_REGP(&drp0[i], d_cr_drp0, apl_dports[i]))
+ ret = 0;
- return 0;
+ return ret;
}
static int dnv_get_registers(void)
^ permalink raw reply related [flat|nested] 2+ messages in thread
* EDAC, pnd2_edac: Fix Apollo Lake DIMM detection
@ 2017-06-29 8:39 Boris Petkov
0 siblings, 0 replies; 2+ messages in thread
From: Boris Petkov @ 2017-06-29 8:39 UTC (permalink / raw)
To: Luck, Tony; +Cc: Qiuxu Zhuo, Mauro Carvalho Chehab, open list:EDAC-PND2
On Wed, Jun 28, 2017 at 04:44:07PM -0700, Luck, Tony wrote:
> From: Tony Luck <tony.luck@intel.com>
>
> Non-existent or empty DIMM slots result in error return from
> RD_REGP(). But we shouldn't give up on failure.
>
> So long as we find at least one DIMM we can continue.
>
> Cc: Qiuxu Zhuo <qiuxu.zhuo@intel.com>
> Cc: Mauro Carvalho Chehab <mchehab@kernel.org> (supporter:EDAC-CORE)
> Cc: linux-edac@vger.kernel.org (open list:EDAC-PND2)
> Signed-off-by: Tony Luck <tony.luck@intel.com>
> ---
> drivers/edac/pnd2_edac.c | 11 ++++++++---
> 1 file changed, 8 insertions(+), 3 deletions(-)
Applied, thanks.
^ permalink raw reply [flat|nested] 2+ messages in thread
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2017-06-28 23:44 EDAC, pnd2_edac: Fix Apollo Lake DIMM detection Luck, Tony
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