drm/gma500: Stop using mode->private_flags

gma500 only uses mode->private_flags to convey the sdvo pixel
multiplier from the encoder .mode_fixup() hook to the encoder
.mode_set() hook. Those always seems get called as a pair so
let's just stuff the pixel multiplier into the encoder itself
as there are no state objects we could use in this non-atomic
driver.

Paves the way for nuking mode->private_flag.

Cc: Patrik Jakobsson <patrik.r.jakobsson@gmail.com>
CC: Sam Ravnborg <sam@ravnborg.org>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: Emil Velikov <emil.l.velikov@gmail.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200428171940.19552-15-ville.syrjala@linux.intel.com

drivers/gpu/drm/gma500/psb_intel_drv.h

@@ -56,25 +56,6 @@
 #define INTEL_OUTPUT_DISPLAYPORT 9
 #define INTEL_OUTPUT_EDP 10
 
-#define INTEL_MODE_PIXEL_MULTIPLIER_SHIFT (0x0)
-#define INTEL_MODE_PIXEL_MULTIPLIER_MASK (0xf << INTEL_MODE_PIXEL_MULTIPLIER_SHIFT)
-
-static inline void
-psb_intel_mode_set_pixel_multiplier(struct drm_display_mode *mode,
-				int multiplier)
-{
-	mode->clock *= multiplier;
-	mode->private_flags |= multiplier;
-}
-
-static inline int
-psb_intel_mode_get_pixel_multiplier(const struct drm_display_mode *mode)
-{
-	return (mode->private_flags & INTEL_MODE_PIXEL_MULTIPLIER_MASK)
-	       >> INTEL_MODE_PIXEL_MULTIPLIER_SHIFT;
-}
-
-
 /*
  * Hold information useally put on the device driver privates here,
  * since it needs to be shared across multiple of devices drivers privates.

drivers/gpu/drm/gma500/psb_intel_sdvo.c

@@ -132,6 +132,8 @@ struct psb_intel_sdvo {
 	/* DDC bus used by this SDVO encoder */
 	uint8_t ddc_bus;
 
+	u8 pixel_multiplier;
+
 	/* Input timings for adjusted_mode */
 	struct psb_intel_sdvo_dtd input_dtd;
 
@@ -928,7 +930,6 @@ static bool psb_intel_sdvo_mode_fixup(struct drm_encoder *encoder,
 				  struct drm_display_mode *adjusted_mode)
 {
 	struct psb_intel_sdvo *psb_intel_sdvo = to_psb_intel_sdvo(encoder);
-	int multiplier;
 
 	/* We need to construct preferred input timings based on our
 	 * output timings.  To do that, we have to set the output
@@ -955,8 +956,9 @@ static bool psb_intel_sdvo_mode_fixup(struct drm_encoder *encoder,
 	/* Make the CRTC code factor in the SDVO pixel multiplier.  The
 	 * SDVO device will factor out the multiplier during mode_set.
 	 */
-	multiplier = psb_intel_sdvo_get_pixel_multiplier(adjusted_mode);
-	psb_intel_mode_set_pixel_multiplier(adjusted_mode, multiplier);
+	psb_intel_sdvo->pixel_multiplier =
+		psb_intel_sdvo_get_pixel_multiplier(adjusted_mode);
+	adjusted_mode->clock *= psb_intel_sdvo->pixel_multiplier;
 
 	return true;
 }
@@ -972,7 +974,6 @@ static void psb_intel_sdvo_mode_set(struct drm_encoder *encoder,
 	u32 sdvox;
 	struct psb_intel_sdvo_in_out_map in_out;
 	struct psb_intel_sdvo_dtd input_dtd;
-	int pixel_multiplier = psb_intel_mode_get_pixel_multiplier(adjusted_mode);
 	int rate;
 	int need_aux = IS_MRST(dev) ? 1 : 0;
 
@@ -1030,7 +1031,7 @@ static void psb_intel_sdvo_mode_set(struct drm_encoder *encoder,
 
 	(void) psb_intel_sdvo_set_input_timing(psb_intel_sdvo, &input_dtd);
 
-	switch (pixel_multiplier) {
+	switch (psb_intel_sdvo->pixel_multiplier) {
 	default:
 	case 1: rate = SDVO_CLOCK_RATE_MULT_1X; break;
 	case 2: rate = SDVO_CLOCK_RATE_MULT_2X; break;