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| author | Andiry Xu <andiry.xu@amd.com> | 2011-03-01 07:57:05 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-03-01 22:01:45 +0100 |
| commit | ad93562bdeecdded7d02eaaaf1aa5705ab57b1b7 (patch) | |
| tree | 92bd220ce673a8260fb4cb4799024529af664208 /drivers/usb/host/ehci.h | |
| parent | arm: omap: usb: clock entries for omap3 and omap4 (diff) | |
| download | linux-ad93562bdeecdded7d02eaaaf1aa5705ab57b1b7.tar.xz linux-ad93562bdeecdded7d02eaaaf1aa5705ab57b1b7.zip | |
USB host: Move AMD PLL quirk to pci-quirks.c
This patch moves the AMD PLL quirk code in OHCI/EHCI driver to pci-quirks.c,
and exports the functions to be used by xHCI driver later.
AMD PLL quirk disable the optional PM feature inside specific
SB700/SB800/Hudson-2/3 platforms under the following conditions:
1. If an isochronous device is connected to OHCI/EHCI/xHCI port and is active;
2. Optional PM feature that powers down the internal Bus PLL when the link is
in low power state is enabled.
Without AMD PLL quirk, USB isochronous stream may stutter or have breaks
occasionally, which greatly impair the performance of audio/video streams.
Currently AMD PLL quirk is implemented in OHCI and EHCI driver, and will be
added to xHCI driver too. They are doing similar things actually, so move
the quirk code to pci-quirks.c, which has several advantages:
1. Remove duplicate defines and functions in OHCI/EHCI (and xHCI) driver and
make them cleaner;
2. AMD chipset information will be probed only once and then stored.
Currently they're probed during every OHCI/EHCI initialization, move
the detect code to pci-quirks.c saves the repeat detect cost;
3. Build up synchronization among OHCI/EHCI/xHCI driver. In current
code, every host controller enable/disable PLL only according to
its own status, and may enable PLL while there is still isoc transfer on
other HCs. Move the quirk to pci-quirks.c prevents this issue.
Signed-off-by: Andiry Xu <andiry.xu@amd.com>
Cc: David Brownell <dbrownell@users.sourceforge.net>
Cc: Alex He <alex.he@amd.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb/host/ehci.h')
| -rw-r--r-- | drivers/usb/host/ehci.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/usb/host/ehci.h b/drivers/usb/host/ehci.h index 799ac16a54b4..f86d3fa20214 100644 --- a/drivers/usb/host/ehci.h +++ b/drivers/usb/host/ehci.h @@ -131,7 +131,7 @@ struct ehci_hcd { /* one per controller */ unsigned has_amcc_usb23:1; unsigned need_io_watchdog:1; unsigned broken_periodic:1; - unsigned amd_l1_fix:1; + unsigned amd_pll_fix:1; unsigned fs_i_thresh:1; /* Intel iso scheduling */ unsigned use_dummy_qh:1; /* AMD Frame List table quirk*/ |