Pankaj, Thanks for your explanation at https://lists.01.org/pipermail/edk2-devel/2017-September/014832.html about the execute flow to reproduce the issue. How about also include the explanation to the commit log like below?
========== Issue : When try to change serial attributes using sermode command, the default values are set with the execute flow as below. The sermode command calls SerialSetAttributes, which sets H/W attributes of Serial device. After that the SerialIo protocol is reinstalled, which causes MdeModulePkg/Universal/Console/TerminalDxe and MdeModulePkg/Universal/Console/ConPlatformDxe drivers' bindings to stop and then start. This in turn calls SerialReset, which undoes changes of SerialSetAttributes. Cause : The SerialReset command resets the attributes' values to default. Fix : Serial Reset command should set the attributes which have been changed by user after calling SerialSetAttributes. ========== Another minor comment, how about update "COM port" to be "Serial Port" in the change? If you agree with above comments, you do not need to send an update patch and I will help push the patch with the updates I comment above and Reviewed-by: Star Zeng <[email protected]>, and of course Regression-tested-by: Laszlo Ersek <[email protected]>. Thanks, Star -----Original Message----- From: Zeng, Star Sent: Monday, September 18, 2017 6:12 PM To: Pankaj Bansal <[email protected]>; [email protected] Cc: Zeng, Star <[email protected]> Subject: RE: [edk2] [PATCH v2] MdeModulePkg/SerialDxe: Fix not able to change serial attributes Pankaj, Thanks for the update. I raised a question in the V1 patch review, could you help kindly provide the feedback? "how you reproduce the issue by sermode command as I see sermode command only calls SerialIo->SetAttributes() but not SerialIo->Reset()" Thanks, Star -----Original Message----- From: edk2-devel [mailto:[email protected]] On Behalf Of Pankaj Bansal Sent: Monday, September 18, 2017 3:43 PM To: [email protected] Cc: Pankaj Bansal <[email protected]> Subject: [edk2] [PATCH v2] MdeModulePkg/SerialDxe: Fix not able to change serial attributes Issue : When try to change serial attributes using sermode command, the default values are set Cause : The SerialReset command resets the attributes' values to default Fix : Serial Reset command should set the attributes which have been changed by user after calling SerialSetAttributes. Contributed-under: TianoCore Contribution Agreement 1.1 Signed-off-by: Pankaj Bansal <[email protected]> --- Changes in v2: - Modified Patch description MdeModulePkg/Universal/SerialDxe/SerialIo.c | 66 ++++++++--------------------- 1 file changed, 18 insertions(+), 48 deletions(-) diff --git a/MdeModulePkg/Universal/SerialDxe/SerialIo.c b/MdeModulePkg/Universal/SerialDxe/SerialIo.c index 43d33db..dc7e13a 100644 --- a/MdeModulePkg/Universal/SerialDxe/SerialIo.c +++ b/MdeModulePkg/Universal/SerialDxe/SerialIo.c @@ -220,7 +220,6 @@ SerialReset ( ) { EFI_STATUS Status; - EFI_TPL Tpl; Status = SerialPortInitialize (); if (EFI_ERROR (Status)) { @@ -228,49 +227,17 @@ SerialReset ( } // - // Set the Serial I/O mode and update the device path - // - - Tpl = gBS->RaiseTPL (TPL_NOTIFY); - - // - // Set the Serial I/O mode - // - This->Mode->ReceiveFifoDepth = PcdGet16 (PcdUartDefaultReceiveFifoDepth); - This->Mode->Timeout = 1000 * 1000; - This->Mode->BaudRate = PcdGet64 (PcdUartDefaultBaudRate); - This->Mode->DataBits = (UINT32) PcdGet8 (PcdUartDefaultDataBits); - This->Mode->Parity = (UINT32) PcdGet8 (PcdUartDefaultParity); - This->Mode->StopBits = (UINT32) PcdGet8 (PcdUartDefaultStopBits); - - // - // Check if the device path has actually changed - // - if (mSerialDevicePath.Uart.BaudRate == This->Mode->BaudRate && - mSerialDevicePath.Uart.DataBits == (UINT8) This->Mode->DataBits && - mSerialDevicePath.Uart.Parity == (UINT8) This->Mode->Parity && - mSerialDevicePath.Uart.StopBits == (UINT8) This->Mode->StopBits - ) { - gBS->RestoreTPL (Tpl); - return EFI_SUCCESS; - } - - // - // Update the device path + // Go set the current attributes // - mSerialDevicePath.Uart.BaudRate = This->Mode->BaudRate; - mSerialDevicePath.Uart.DataBits = (UINT8) This->Mode->DataBits; - mSerialDevicePath.Uart.Parity = (UINT8) This->Mode->Parity; - mSerialDevicePath.Uart.StopBits = (UINT8) This->Mode->StopBits; - - Status = gBS->ReinstallProtocolInterface ( - mSerialHandle, - &gEfiDevicePathProtocolGuid, - &mSerialDevicePath, - &mSerialDevicePath - ); - - gBS->RestoreTPL (Tpl); + Status = This->SetAttributes ( + This, + This->Mode->BaudRate, + This->Mode->ReceiveFifoDepth, + This->Mode->Timeout, + (EFI_PARITY_TYPE) This->Mode->Parity, + (UINT8) This->Mode->DataBits, + (EFI_STOP_BITS_TYPE) This->Mode->StopBits + ); return Status; } @@ -513,11 +480,6 @@ SerialDxeInitialize ( { EFI_STATUS Status; - Status = SerialPortInitialize (); - if (EFI_ERROR (Status)) { - return Status; - } - mSerialIoMode.BaudRate = PcdGet64 (PcdUartDefaultBaudRate); mSerialIoMode.DataBits = (UINT32) PcdGet8 (PcdUartDefaultDataBits); mSerialIoMode.Parity = (UINT32) PcdGet8 (PcdUartDefaultParity); @@ -529,6 +491,14 @@ SerialDxeInitialize ( mSerialDevicePath.Uart.StopBits = PcdGet8 (PcdUartDefaultStopBits); // + // Issue a reset to initialize the COM port // Status = + mSerialIoTemplate.Reset (&mSerialIoTemplate); if (EFI_ERROR (Status)) + { + return Status; + } + + // // Make a new handle with Serial IO protocol and its device path on it. // Status = gBS->InstallMultipleProtocolInterfaces ( -- 2.7.4 _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel _______________________________________________ edk2-devel mailing list [email protected] https://lists.01.org/mailman/listinfo/edk2-devel
