DS I/O: Enable POWCNT1 bit 1 at boot (fixes #616)

CHANGES

@@ -11,6 +11,7 @@ Bugfixes:
  - DS Video: Fix affine parameter advancing (fixes mgba.io/i/802)
  - DS GX: Fix incorrect W values
  - DS Video: Fix 2D/3D blending alpha values
+ - DS I/O: Enable POWCNT1 bit 1 at boot (fixes mgba.io/i/616)
 Misc:
  - DS GX: Clean up and unify texture mapping
  - DS Core: Add symbol loading

src/ds/io.c

@@ -596,6 +596,7 @@ void DS9IOInit(struct DS* ds) {
 	ds->memory.io9[DS_REG_POSTFLG >> 1] = 0x0001;
 	ds->memory.io9[DS9_REG_GXSTAT_HI >> 1] = 0x0600;
 	DS9IOWrite(ds, DS9_REG_VRAMCNT_G, 0x0300);
+	DS9IOWrite(ds, DS9_REG_POWCNT1, 0x0001);
 }
 
 void DS9IOWrite(struct DS* ds, uint32_t address, uint16_t value) {