drm/vkms: Fix cpu_to_le16()/le16_to_cpu() warnings

Building with Sparse enabled prints this warning for cpu_to_le16()
calls:

    warning: incorrect type in assignment (different base types)
        expected unsigned short [usertype]
        got restricted __le16 [usertype]

And this warning for le16_to_cpu() calls:

    warning: cast to restricted __le16

Declare the target buffer as __le16 to fix both warnings.

Reviewed-by: Thomas Zimmermann <tzimmermann@suse.de>
Reviewed-by: Louis Chauvet <louis.chauvet@bootlin.com>
Acked-by: Maíra Canal <mcanal@igalia.com>
Signed-off-by: José Expósito <jose.exposito89@gmail.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240716161725.41408-2-jose.exposito89@gmail.com

Author: JoseExposito

drivers/gpu/drm/vkms/vkms_formats.c

@@ -75,7 +75,7 @@ static void XRGB8888_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixe
 
 static void ARGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
 {
-	u16 *pixels = (u16 *)src_pixels;
+	__le16 *pixels = (__force __le16 *)src_pixels;
 
 	out_pixel->a = le16_to_cpu(pixels[3]);
 	out_pixel->r = le16_to_cpu(pixels[2]);
@@ -85,7 +85,7 @@ static void ARGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_
 
 static void XRGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
 {
-	u16 *pixels = (u16 *)src_pixels;
+	__le16 *pixels = (__force __le16 *)src_pixels;
 
 	out_pixel->a = (u16)0xffff;
 	out_pixel->r = le16_to_cpu(pixels[2]);
@@ -95,7 +95,7 @@ static void XRGB16161616_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_
 
 static void RGB565_to_argb_u16(u8 *src_pixels, struct pixel_argb_u16 *out_pixel)
 {
-	u16 *pixels = (u16 *)src_pixels;
+	__le16 *pixels = (__force __le16 *)src_pixels;
 
 	s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
 	s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));
@@ -178,7 +178,7 @@ static void argb_u16_to_XRGB8888(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel
 
 static void argb_u16_to_ARGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
 {
-	u16 *pixels = (u16 *)dst_pixels;
+	__le16 *pixels = (__force __le16 *)dst_pixels;
 
 	pixels[3] = cpu_to_le16(in_pixel->a);
 	pixels[2] = cpu_to_le16(in_pixel->r);
@@ -188,17 +188,17 @@ static void argb_u16_to_ARGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_p
 
 static void argb_u16_to_XRGB16161616(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
 {
-	u16 *pixels = (u16 *)dst_pixels;
+	__le16 *pixels = (__force __le16 *)dst_pixels;
 
-	pixels[3] = 0xffff;
+	pixels[3] = cpu_to_le16(0xffff);
 	pixels[2] = cpu_to_le16(in_pixel->r);
 	pixels[1] = cpu_to_le16(in_pixel->g);
 	pixels[0] = cpu_to_le16(in_pixel->b);
 }
 
 static void argb_u16_to_RGB565(u8 *dst_pixels, struct pixel_argb_u16 *in_pixel)
 {
-	u16 *pixels = (u16 *)dst_pixels;
+	__le16 *pixels = (__force __le16 *)dst_pixels;
 
 	s64 fp_rb_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(31));
 	s64 fp_g_ratio = drm_fixp_div(drm_int2fixp(65535), drm_int2fixp(63));