drm/sun4i: Eliminate pointless on stack copy of drm_display_info

Just use a pointer to the display_info rather than make a copy
on stack.

Cc: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190326173810.11979-1-ville.syrjala@linux.intel.comAcked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/sun4i/sun4i_tcon.c

@@ -478,7 +478,7 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
 				     const struct drm_display_mode *mode)
 {
 	struct drm_connector *connector = sun4i_tcon_get_connector(encoder);
-	struct drm_display_info display_info = connector->display_info;
+	const struct drm_display_info *info = &connector->display_info;
 	unsigned int bp, hsync, vsync;
 	u8 clk_delay;
 	u32 val = 0;
@@ -539,7 +539,7 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
 	if (mode->flags & DRM_MODE_FLAG_PVSYNC)
 		val |= SUN4I_TCON0_IO_POL_VSYNC_POSITIVE;
 
-	if (display_info.bus_flags & DRM_BUS_FLAG_DE_LOW)
+	if (info->bus_flags & DRM_BUS_FLAG_DE_LOW)
 		val |= SUN4I_TCON0_IO_POL_DE_NEGATIVE;
 
 	/*
@@ -557,10 +557,10 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon *tcon,
 	 * Following code is a way to avoid quirks all around TCON
 	 * and DOTCLOCK drivers.
 	 */
-	if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
+	if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE)
 		clk_set_phase(tcon->dclk, 240);
 
-	if (display_info.bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
+	if (info->bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
 		clk_set_phase(tcon->dclk, 0);
 
 	regmap_update_bits(tcon->regs, SUN4I_TCON0_IO_POL_REG,