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MdeModulePkg/PciBusDxe: Improve the flow of testing support attributes 

https://bugzilla.tianocore.org/show_bug.cgi?id=3635

Currently, in order to test the supported attributes,
the PciTestSupportedAttribute() will set the command register
to 0x27 (EFI_PCI_COMMAND_IO_SPACE, EFI_PCI_COMMAND_MEMORY_SPACE,
EFI_PCI_COMMAND_BUS_MASTER, EFI_PCI_COMMAND_VGA_PALETTE_SNOOP) firstly,
and then read back to check whether these attributes are
set successfully in the device.
This will cause the other enabled bits
 (other than EFI_PCI_COMMAND_IO_SPACE,EFI_PCI_COMMAND_MEMORY_SPACE,
 EFI_PCI_COMMAND_BUS_MASTER,EFI_PCI_COMMAND_VGA_PALETTE_SNOOP)
 be cleared for a short of time
 This patch fixes this issue by keeping the origina
 enabled bits when setting 0x27.

Signed-off-by: xueshengfeng <xueshengfeng@byosoft.com.cn>
Reviewed-by: Ray <ray.ni@intel.com>
This commit is contained in:
xueshengfeng 2021-09-24 14:30:45 +08:00 committed by mergify[bot]
parent d60915b751
commit 46b4606ba2
1 changed files with 5 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
MdeModulePkg/Bus/Pci/PciBusDxe/PciEnumeratorSupport.c
View File

@ -933,6 +933,7 @@ PciTestSupportedAttribute (
)
{
EFI_TPL OldTpl;
UINT16 CommandValue;
//
// Preserve the original value
@ -943,10 +944,12 @@ PciTestSupportedAttribute (
// Raise TPL to high level to disable timer interrupt while the BAR is probed
//
OldTpl = gBS->RaiseTPL (TPL_HIGH_LEVEL);
CommandValue = *Command | *OldCommand;
PCI_SET_COMMAND_REGISTER (PciIoDevice, *Command);
PCI_READ_COMMAND_REGISTER (PciIoDevice, Command);
PCI_SET_COMMAND_REGISTER (PciIoDevice, CommandValue);
PCI_READ_COMMAND_REGISTER (PciIoDevice, &CommandValue);
*Command = *Command & CommandValue;
//
// Write back the original value
//