drm: mxsfb: Turn mxsfb_set_pixel_fmt() into a void function

The mxsfb_set_pixel_fmt() function returns an error when the selected
pixel format is unsupported. This can never happen, as such errors are
caught by the DRM core. Remove the error check.
Signed-off-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Reviewed-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Emil Velikov <emil.l.velikov@gmail.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20200727020654.8231-20-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/mxsfb/mxsfb_kms.c

@@ -43,7 +43,7 @@ static u32 set_hsync_pulse_width(struct mxsfb_drm_private *mxsfb, u32 val)
 }
 
 /* Setup the MXSFB registers for decoding the pixels out of the framebuffer */
-static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb)
+static void mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb)
 {
 	struct drm_device *drm = mxsfb->drm;
 	const u32 format = mxsfb->crtc.primary->state->fb->format->format;
@@ -67,15 +67,10 @@ static int mxsfb_set_pixel_fmt(struct mxsfb_drm_private *mxsfb)
 		/* Do not use packed pixels = one pixel per word instead. */
 		ctrl1 |= CTRL1_SET_BYTE_PACKAGING(0x7);
 		break;
-	default:
-		dev_err(drm->dev, "Unhandled pixel format %08x\n", format);
-		return -EINVAL;
 	}
 
 	writel(ctrl1, mxsfb->base + LCDC_CTRL1);
 	writel(ctrl, mxsfb->base + LCDC_CTRL);
-
-	return 0;
 }
 
 static void mxsfb_set_bus_fmt(struct mxsfb_drm_private *mxsfb)
@@ -218,9 +213,7 @@ static void mxsfb_crtc_mode_set_nofb(struct mxsfb_drm_private *mxsfb)
 	/* Clear the FIFOs */
 	writel(CTRL1_FIFO_CLEAR, mxsfb->base + LCDC_CTRL1 + REG_SET);
 
-	err = mxsfb_set_pixel_fmt(mxsfb);
-	if (err)
-		return;
+	mxsfb_set_pixel_fmt(mxsfb);
 
 	clk_set_rate(mxsfb->clk, m->crtc_clock * 1000);