drm/armada: add comments about HWC32 cursor colour format (5d32b660) · Commits · 戴 / test

drivers/gpu/drm/armada/armada_crtc.c

+7 −0

Original line number	Diff line number	Diff line
		@@ -515,6 +515,13 @@ static void armada_load_cursor_argb(void __iomem base, uint32_t pix,
		for (x = 0; x < width; x++, p++) {
		uint32_t val = *p;

		/*
		* In "ARGB888" (HWC32) mode, writing to the SRAM
		* requires these bits to contain:
		* 31:24 = alpha 23:16 = blue 15:8 = green 7:0 = red
		* So, it's actually ABGR8888. This is independent
		* of the SWAPRB bits in DMA control register 0.
		*/
		val = (val & 0xff00ff00) \|
		(val & 0x000000ff) << 16 \|
		(val & 0x00ff0000) >> 16;