drm/omap: display: don't use dsi_get_pixel_size()

display.c uses dsi_get_pixel_size() which is implemented in the DSI
driver, and we won't have that in the omapdss-base module, to which we
want to move display.c

This patch changes display.c not to use dsi_get_pixel_size(). The call
can be replaced with a simple check for OMAP_DSS_DSI_FMT_RGB565.

We can also make dsi_get_pixel_size() static as it's no longer used
outside dsi.c.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/gpu/drm/omapdrm/dss/display.c

@@ -55,10 +55,10 @@ int omapdss_default_get_recommended_bpp(struct omap_dss_device *dssdev)
 		else
 			return 16;
 	case OMAP_DISPLAY_TYPE_DSI:
-		if (dsi_get_pixel_size(dssdev->panel.dsi_pix_fmt) > 16)
-			return 24;
-		else
+		if (dssdev->panel.dsi_pix_fmt == OMAP_DSS_DSI_FMT_RGB565)
 			return 16;
+		else
+			return 24;
 	case OMAP_DISPLAY_TYPE_VENC:
 	case OMAP_DISPLAY_TYPE_SDI:
 	case OMAP_DISPLAY_TYPE_HDMI:

drivers/gpu/drm/omapdrm/dss/dsi.c

@@ -527,7 +527,7 @@ static inline int wait_for_bit_change(struct platform_device *dsidev,
 	return !value;
 }
 
-u8 dsi_get_pixel_size(enum omap_dss_dsi_pixel_format fmt)
+static u8 dsi_get_pixel_size(enum omap_dss_dsi_pixel_format fmt)
 {
 	switch (fmt) {
 	case OMAP_DSS_DSI_FMT_RGB888:

drivers/gpu/drm/omapdrm/dss/dss.h

@@ -315,15 +315,7 @@ void dsi_uninit_platform_driver(void);
 void dsi_dump_clocks(struct seq_file *s);
 
 void dsi_irq_handler(void);
-u8 dsi_get_pixel_size(enum omap_dss_dsi_pixel_format fmt);
 
-#else
-static inline u8 dsi_get_pixel_size(enum omap_dss_dsi_pixel_format fmt)
-{
-	WARN(1, "%s: DSI not compiled in, returning pixel_size as 0\n",
-	     __func__);
-	return 0;
-}
 #endif
 
 /* DPI */