DwcSdhciDxe: Disable ADMA2 to avoid data corruption

This controller has the limitation that a single ADMA2 descriptor cannot cross 128 MB boundaries and must be split. This would require a patch in SdMmcPciHcDxe, but SDMA works fine for the time being. Signed-off-by: Mario Bălănică <[email protected]>
edk2-porting · Jun 22, 2024 · 02d1502 · 02d1502
1 parent 053cf71
commit 02d1502
Showing 1 changed file with 9 additions and 0 deletions.
diff --git a/edk2-rockchip/Silicon/Rockchip/Drivers/DwcSdhciDxe/DwcSdhciDxe.c b/edk2-rockchip/Silicon/Rockchip/Drivers/DwcSdhciDxe/DwcSdhciDxe.c
@@ -59,6 +59,15 @@ EmmcSdMmcCapability (
     return EFI_NOT_FOUND;
   }
 
+  //
+  // Disable ADMA2 to avoid data corruption.
+  // This controller has the limitation that a single descriptor
+  // cannot cross 128 MB boundaries and must be split.
+  // This would require a patch in SdMmcPciHcDxe, but SDMA works
+  // fine for the time being.
+  //
+  Capability->Adma2 = 0;
+
   Capability->Hs400 = !EMMC_DISABLE_HS400;
 
   if (EMMC_FORCE_HIGH_SPEED) {