| Message ID | 20231010204436.1000644-3-helgaas@kernel.org |
|---|---|
| State | New |
| Headers | show |
| Series | PCI: Use FIELD_GET() and FIELD_PREP() | expand |
On Tue, 10 Oct 2023 15:44:28 -0500 Bjorn Helgaas <helgaas@kernel.org> wrote: > From: Bjorn Helgaas <bhelgaas@google.com> > > Use FIELD_GET() to remove dependences on the field position, i.e., the > shift value. No functional change intended. > > Separate because this isn't as trivial as the other FIELD_GET() changes. > > See 907830b0fc9e ("PCI: Add a REBAR size quirk for Sapphire RX 5600 XT > Pulse") > > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > Cc: Nirmoy Das <nirmoy.das@amd.com> Change would be a tiny bit more obvious without the early return, but I can see why you think that is an improvement over relying on the return just below. Reviewed-by: Jonathan Cameron <Jonathan.Cameron@huawei.com> > --- > drivers/pci/pci.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index 848c9ee65d7f..5dc6e7cdfb71 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -3751,14 +3751,14 @@ u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar) > return 0; > > pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap); > - cap &= PCI_REBAR_CAP_SIZES; > + cap = FIELD_GET(PCI_REBAR_CAP_SIZES, cap); > > /* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */ > if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f && > - bar == 0 && cap == 0x7000) > - cap = 0x3f000; > + bar == 0 && cap == 0x700) > + return 0x3f00; > > - return cap >> 4; > + return cap; > } > EXPORT_SYMBOL(pci_rebar_get_possible_sizes); >
On Tue, 10 Oct 2023, Bjorn Helgaas wrote: > From: Bjorn Helgaas <bhelgaas@google.com> > > Use FIELD_GET() to remove dependences on the field position, i.e., the > shift value. No functional change intended. > > Separate because this isn't as trivial as the other FIELD_GET() changes. > > See 907830b0fc9e ("PCI: Add a REBAR size quirk for Sapphire RX 5600 XT > Pulse") > > Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> > Cc: Nirmoy Das <nirmoy.das@amd.com> > --- > drivers/pci/pci.c | 8 ++++---- > 1 file changed, 4 insertions(+), 4 deletions(-) > > diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c > index 848c9ee65d7f..5dc6e7cdfb71 100644 > --- a/drivers/pci/pci.c > +++ b/drivers/pci/pci.c > @@ -3751,14 +3751,14 @@ u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar) > return 0; > > pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap); > - cap &= PCI_REBAR_CAP_SIZES; > + cap = FIELD_GET(PCI_REBAR_CAP_SIZES, cap); > > /* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */ > if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f && > - bar == 0 && cap == 0x7000) > - cap = 0x3f000; > + bar == 0 && cap == 0x700) > + return 0x3f00; > > - return cap >> 4; > + return cap; > } > EXPORT_SYMBOL(pci_rebar_get_possible_sizes); > > Reviewed-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c index 848c9ee65d7f..5dc6e7cdfb71 100644 --- a/drivers/pci/pci.c +++ b/drivers/pci/pci.c @@ -3751,14 +3751,14 @@ u32 pci_rebar_get_possible_sizes(struct pci_dev *pdev, int bar) return 0; pci_read_config_dword(pdev, pos + PCI_REBAR_CAP, &cap); - cap &= PCI_REBAR_CAP_SIZES; + cap = FIELD_GET(PCI_REBAR_CAP_SIZES, cap); /* Sapphire RX 5600 XT Pulse has an invalid cap dword for BAR 0 */ if (pdev->vendor == PCI_VENDOR_ID_ATI && pdev->device == 0x731f && - bar == 0 && cap == 0x7000) - cap = 0x3f000; + bar == 0 && cap == 0x700) + return 0x3f00; - return cap >> 4; + return cap; } EXPORT_SYMBOL(pci_rebar_get_possible_sizes);