drm/imx: consolidate bus format variable names

This patch consolidates the different interface_pix_fmt, pixel_fmt, pix_fmt,
and pixfmt variables to a common name "bus_format" wherever they describe the
pixel format on the bus between display controller and encoder hardware.
At the same time, it renames imx_drm_panel_format to imx_drm_set_bus_format.

Signed-off-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Emil Renner Berthing <kernel@esmil.dk>
diff --git a/drivers/gpu/drm/imx/ipuv3-crtc.c b/drivers/gpu/drm/imx/ipuv3-crtc.c
index 4a393f6..7bc8301 100644
--- a/drivers/gpu/drm/imx/ipuv3-crtc.c
+++ b/drivers/gpu/drm/imx/ipuv3-crtc.c
@@ -45,7 +45,7 @@
 	struct drm_pending_vblank_event *page_flip_event;
 	struct drm_framebuffer	*newfb;
 	int			irq;
-	u32			interface_pix_fmt;
+	u32			bus_format;
 	int			di_hsync_pin;
 	int			di_vsync_pin;
 };
@@ -145,7 +145,6 @@
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 	struct ipu_di_signal_cfg sig_cfg = {};
 	unsigned long encoder_types = 0;
-	u32 out_pixel_fmt;
 	int ret;
 
 	dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
@@ -173,11 +172,9 @@
 	else
 		sig_cfg.clkflags = 0;
 
-	out_pixel_fmt = ipu_crtc->interface_pix_fmt;
-
 	sig_cfg.enable_pol = 1;
 	sig_cfg.clk_pol = 0;
-	sig_cfg.pixel_fmt = out_pixel_fmt;
+	sig_cfg.bus_format = ipu_crtc->bus_format;
 	sig_cfg.v_to_h_sync = 0;
 	sig_cfg.hsync_pin = ipu_crtc->di_hsync_pin;
 	sig_cfg.vsync_pin = ipu_crtc->di_vsync_pin;
@@ -186,7 +183,7 @@
 
 	ret = ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
 			       mode->flags & DRM_MODE_FLAG_INTERLACE,
-			       out_pixel_fmt, mode->hdisplay);
+			       ipu_crtc->bus_format, mode->hdisplay);
 	if (ret) {
 		dev_err(ipu_crtc->dev,
 				"initializing display controller failed with %d\n",
@@ -294,11 +291,11 @@
 }
 
 static int ipu_set_interface_pix_fmt(struct drm_crtc *crtc,
-		u32 pixfmt, int hsync_pin, int vsync_pin)
+		u32 bus_format, int hsync_pin, int vsync_pin)
 {
 	struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
 
-	ipu_crtc->interface_pix_fmt = pixfmt;
+	ipu_crtc->bus_format = bus_format;
 	ipu_crtc->di_hsync_pin = hsync_pin;
 	ipu_crtc->di_vsync_pin = vsync_pin;