drm: mali-dp: Add plane upscaling support

Enable the scaling engine for upscaling a single plane using the polyphase
scaler. No image enhancement support or downscaling yet*, and composition
result scaling is not implemented.

* Downscaling a plane requires mclk > pxlclk.

Signed-off-by: Mihail Atanassov <mihail.atanassov@arm.com>
Signed-off-by: Liviu Dudau <Liviu.Dudau@arm.com>

drivers/gpu/drm/arm/malidp_drv.h

@@ -53,6 +53,9 @@ struct malidp_crtc_state {
 	struct drm_crtc_state base;
 	u32 gamma_coeffs[MALIDP_COEFFTAB_NUM_COEFFS];
 	u32 coloradj_coeffs[MALIDP_COLORADJ_NUM_COEFFS];
+	struct malidp_se_config scaler_config;
+	/* Bitfield of all the planes that have requested a scaled output. */
+	u8 scaled_planes_mask;
 };
 
 #define to_malidp_crtc_state(x) container_of(x, struct malidp_crtc_state, base)