This is a note to let you know that I've just added the patch titled
usb: pci-quirks: Correct AMD PLL quirk detection
to my usb git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/usb.git in the usb-linus branch.
The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.)
The patch will hopefully also be merged in Linus's tree for the next -rc kernel release.
If you have any questions about this process, please let me know.
From f3dccdaade4118070a3a47bef6b18321431f9ac6 Mon Sep 17 00:00:00 2001
From: Ryan Kennedy ryan5544@gmail.com Date: Thu, 4 Jul 2019 11:35:28 -0400 Subject: usb: pci-quirks: Correct AMD PLL quirk detection
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: e788787ef4f9 ("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 --- drivers/usb/host/pci-quirks.c | 31 +++++++++++++++++++------------ 1 file changed, 19 insertions(+), 12 deletions(-)
diff --git a/drivers/usb/host/pci-quirks.c b/drivers/usb/host/pci-quirks.c index 3ce71cbfbb58..ad05c27b3a7b 100644 --- a/drivers/usb/host/pci-quirks.c +++ b/drivers/usb/host/pci-quirks.c @@ -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 @@ int usb_amd_find_chipset_info(void)
/* 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 @@ int usb_amd_find_chipset_info(void) spin_unlock_irqrestore(&amd_lock, flags); }
- return ret; + return need_pll_quirk; } EXPORT_SYMBOL_GPL(usb_amd_find_chipset_info);