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firewire: ohci: fix up configuration of TI chips 

On TI chips (OHCI-Lynx and later), enable link enhancements features
that TI recommends to be used.  None of these are required for proper
operation, but they are safe and nice to have.

In theory, these bits should have been set by default, but in practice,
some BIOS/EEPROM writers apparently do not read the datasheet, or get
spooked by names like "unfair".

Signed-off-by: Clemens Ladisch <clemens@ladisch.de>
Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de>
This commit is contained in:
Clemens Ladisch 2010-04-01 16:43:59 +02:00 committed by Stefan Richter
parent 925e7a6504
commit 54672386cc
2 changed files with 26 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
drivers/firewire/ohci.c
View File

@ -2431,7 +2431,7 @@ static int __devinit pci_probe(struct pci_dev *dev,
const struct pci_device_id *ent)
{
struct fw_ohci *ohci;
u32 bus_options, max_receive, link_speed, version;
u32 bus_options, max_receive, link_speed, version, link_enh;
u64 guid;
int i, err, n_ir, n_it;
size_t size;
@ -2484,6 +2484,23 @@ static int __devinit pci_probe(struct pci_dev *dev,
if (param_quirks)
ohci->quirks = param_quirks;
/* TI OHCI-Lynx and compatible: set recommended configuration bits. */
if (dev->vendor == PCI_VENDOR_ID_TI) {
pci_read_config_dword(dev, PCI_CFG_TI_LinkEnh, &link_enh);
/* adjust latency of ATx FIFO: use 1.7 KB threshold */
link_enh &= ~TI_LinkEnh_atx_thresh_mask;
link_enh |= TI_LinkEnh_atx_thresh_1_7K;
/* use priority arbitration for asynchronous responses */
link_enh |= TI_LinkEnh_enab_unfair;
/* required for aPhyEnhanceEnable to work */
link_enh |= TI_LinkEnh_enab_accel;
pci_write_config_dword(dev, PCI_CFG_TI_LinkEnh, link_enh);
}
ar_context_init(&ohci->ar_request_ctx, ohci,
OHCI1394_AsReqRcvContextControlSet);

8
drivers/firewire/ohci.h
View File

@ -154,4 +154,12 @@
#define OHCI1394_phy_tcode 0xe
/* TI extensions */
#define PCI_CFG_TI_LinkEnh 0xf4
#define TI_LinkEnh_enab_accel 0x00000002
#define TI_LinkEnh_enab_unfair 0x00000080
#define TI_LinkEnh_atx_thresh_mask 0x00003000
#define TI_LinkEnh_atx_thresh_1_7K 0x00001000
#endif /* _FIREWIRE_OHCI_H */