[edk2-devel] [PATCH 1/2] UefiCpuPkg: CpuTimerDxeRiscV64: Fix incorrect value sent to SbiSetTimer

[Tuan Phan]

SbiSetTimer expects core tick value.

Signed-off-by: Tuan Phan <tphan at ventanamicro.com>
---
 .../CpuTimerDxeRiscV64/CpuTimerDxeRiscV64.inf |  3 +++
 UefiCpuPkg/CpuTimerDxeRiscV64/Timer.c         | 26 ++++++++++++++++---
 UefiCpuPkg/CpuTimerDxeRiscV64/Timer.h         |  2 +-
 3 files changed, 26 insertions(+), 5 deletions(-)

diff --git a/UefiCpuPkg/CpuTimerDxeRiscV64/CpuTimerDxeRiscV64.inf b/UefiCpuPkg/CpuTimerDxeRiscV64/CpuTimerDxeRiscV64.inf
index c76bd9648373..cd58d3a2f86b 100644
--- a/UefiCpuPkg/CpuTimerDxeRiscV64/CpuTimerDxeRiscV64.inf
+++ b/UefiCpuPkg/CpuTimerDxeRiscV64/CpuTimerDxeRiscV64.inf
@@ -40,6 +40,9 @@
   Timer.h
   Timer.c
 
+[Pcd]
+  gUefiCpuPkgTokenSpaceGuid.PcdCpuCoreCrystalClockFrequency  ## CONSUMES
+
 [Protocols]
   gEfiCpuArchProtocolGuid       ## CONSUMES
   gEfiTimerArchProtocolGuid     ## PRODUCES
diff --git a/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.c b/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.c
index fa957ba5e3e9..a8afb649149f 100644
--- a/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.c
+++ b/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.c
@@ -80,8 +80,15 @@ TimerInterruptHandler (
     return;
   }
 
-  mLastPeriodStart          = PeriodStart;
-  SbiSetTimer (PeriodStart += mTimerPeriod);
+  mLastPeriodStart = PeriodStart;
+  PeriodStart     += DivU64x32 (
+                        MultU64x32 (
+                          mTimerPeriod,
+                          PcdGet64 (PcdCpuCoreCrystalClockFrequency)
+                        ),
+                        1000000u
+                      );   // convert to tick
+  SbiSetTimer (PeriodStart);
   RiscVEnableTimerInterrupt (); // enable SMode timer int
   gBS->RestoreTPL (OriginalTPL);
 }
@@ -163,6 +170,8 @@ TimerDriverSetTimerPeriod (
   IN UINT64                   TimerPeriod
   )
 {
+  UINT64  PeriodStart;
+
   DEBUG ((DEBUG_INFO, "TimerDriverSetTimerPeriod(0x%lx)\n", TimerPeriod));
 
   if (TimerPeriod == 0) {
@@ -171,9 +180,18 @@ TimerDriverSetTimerPeriod (
     return EFI_SUCCESS;
   }
 
-  mTimerPeriod     = TimerPeriod / 10; // convert unit from 100ns to 1us
+  mTimerPeriod = TimerPeriod / 10;     // convert unit from 100ns to 1us
+
   mLastPeriodStart = RiscVReadTimer ();
-  SbiSetTimer (mLastPeriodStart + mTimerPeriod);
+  PeriodStart      = mLastPeriodStart;
+  PeriodStart     += DivU64x32 (
+                        MultU64x32 (
+                          mTimerPeriod,
+                          PcdGet64 (PcdCpuCoreCrystalClockFrequency)
+                        ),
+                        1000000u
+                      ); // convert to tick
+  SbiSetTimer (PeriodStart);
 
   mCpu->EnableInterrupt (mCpu);
   RiscVEnableTimerInterrupt (); // enable SMode timer int
diff --git a/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.h b/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.h
index 586eb0cfadb4..9b3542230cb5 100644
--- a/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.h
+++ b/UefiCpuPkg/CpuTimerDxeRiscV64/Timer.h
@@ -21,7 +21,7 @@
 #include <Library/IoLib.h>
 
 //
-// RISC-V use 100us timer.
+// RISC-V use 100ns timer.
 // The default timer tick duration is set to 10 ms = 10 * 1000 * 10 100 ns units
 //
 #define DEFAULT_TIMER_TICK_DURATION  100000
-- 
2.25.1



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