amd/common: Handle alignment of 96-bit formats.

addrlib doesn't quite do it right, so do it ourselves.

Closes: https://gitlab.freedesktop.org/mesa/mesa/issues/2162
CC: <mesa-stable@lists.freedesktop.org>
Reviewed-by: Samuel Pitoiset <samuel.pitoiset@gmail.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>

src/amd/common/ac_surface.c

@@ -206,6 +206,17 @@ static int gfx6_compute_level(ADDR_HANDLE addrlib,
 		AddrSurfInfoIn->width = align(AddrSurfInfoIn->width, alignment);
 	}
 
+	/* addrlib assumes the bytes/pixel is a divisor of 64, which is not
+	 * true for r32g32b32 formats. */
+	if (AddrSurfInfoIn->bpp == 96) {
+		assert(config->info.levels == 1);
+		assert(AddrSurfInfoIn->tileMode == ADDR_TM_LINEAR_ALIGNED);
+
+		/* The least common multiple of 64 bytes and 12 bytes/pixel is
+		 * 192 bytes, or 16 pixels. */
+		AddrSurfInfoIn->width = align(AddrSurfInfoIn->width, 16);
+	}
+
 	if (config->is_3d)
 		AddrSurfInfoIn->numSlices = u_minify(config->info.depth, level);
 	else if (config->is_cube)