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usb: pci-quirks: Correct AMD PLL quirk detection

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The AMD PLL USB quirk is incorrectly enabled on newer Ryzen
chipsets. The logic in usb_amd_find_chipset_info currently checks
for unaffected chipsets rather than affected ones. This broke
once a new chipset was added in e788787ef. It makes more sense
to reverse the logic so it won't need to be updated as new
chipsets are added. Note that the core of the workaround in
usb_amd_quirk_pll does correctly check the chipset.

Signed-off-by: Ryan Kennedy <ryan5544@gmail.com>
Fixes: e788787ef4 ("usb:xhci:Add quirk for Certain failing HP keyboard on reset after resume")
Cc: stable <stable@vger.kernel.org>
Acked-by: Alan Stern <stern@rowland.harvard.edu>
Link: https://lore.kernel.org/r/20190704153529.9429-2-ryan5544@gmail.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ryan Kennedy 2019-07-04 11:35:28 -04:00 committed by Greg Kroah-Hartman
parent 5f9e832c13
commit f3dccdaade
1 changed files with 19 additions and 12 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
drivers/usb/host/pci-quirks.c
View File

@ -205,7 +205,7 @@ int usb_amd_find_chipset_info(void)
{
unsigned long flags;
struct amd_chipset_info info;
int ret;
int need_pll_quirk = 0;
spin_lock_irqsave(&amd_lock, flags);
@ -219,21 +219,28 @@ int usb_amd_find_chipset_info(void)
spin_unlock_irqrestore(&amd_lock, flags);
if (!amd_chipset_sb_type_init(&info)) {
ret = 0;
goto commit;
}
/* Below chipset generations needn't enable AMD PLL quirk */
if (info.sb_type.gen == AMD_CHIPSET_UNKNOWN ||
info.sb_type.gen == AMD_CHIPSET_SB600 ||
info.sb_type.gen == AMD_CHIPSET_YANGTZE ||
(info.sb_type.gen == AMD_CHIPSET_SB700 &&
info.sb_type.rev > 0x3b)) {
switch (info.sb_type.gen) {
case AMD_CHIPSET_SB700:
need_pll_quirk = info.sb_type.rev <= 0x3B;
break;
case AMD_CHIPSET_SB800:
case AMD_CHIPSET_HUDSON2:
case AMD_CHIPSET_BOLTON:
need_pll_quirk = 1;
break;
default:
need_pll_quirk = 0;
break;
}
if (!need_pll_quirk) {
if (info.smbus_dev) {
pci_dev_put(info.smbus_dev);
info.smbus_dev = NULL;
}
ret = 0;
goto commit;
}
@ -252,7 +259,7 @@ int usb_amd_find_chipset_info(void)
}
}
ret = info.probe_result = 1;
need_pll_quirk = info.probe_result = 1;
printk(KERN_DEBUG "QUIRK: Enable AMD PLL fix\n");
commit:
@ -263,7 +270,7 @@ commit:
/* Mark that we where here */
amd_chipset.probe_count++;
ret = amd_chipset.probe_result;
need_pll_quirk = amd_chipset.probe_result;
spin_unlock_irqrestore(&amd_lock, flags);
@ -277,7 +284,7 @@ commit:
spin_unlock_irqrestore(&amd_lock, flags);
}
return ret;
return need_pll_quirk;
}
EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);