drm: mxsfb: Use LCDC_CTRL register name explicitly

The LCDC_CTRL register is located at address 0x0000. Some of the
accesses to the register simply use the mxsfb->base address. Reference
the LCDC_CTRL register explicitly instead to clarify the code.
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/20200727020654.8231-8-laurent.pinchart@ideasonboard.com

drivers/gpu/drm/mxsfb/mxsfb_crtc.c

@@ -170,17 +170,17 @@ static int mxsfb_reset_block(struct mxsfb_drm_private *mxsfb)
 {
 	int ret;
 
-	ret = clear_poll_bit(mxsfb->base, MODULE_SFTRST);
+	ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, MODULE_SFTRST);
 	if (ret)
 		return ret;
 
-	writel(MODULE_CLKGATE, mxsfb->base + MXS_CLR_ADDR);
+	writel(MODULE_CLKGATE, mxsfb->base + LCDC_CTRL + MXS_CLR_ADDR);
 
-	ret = clear_poll_bit(mxsfb->base, MODULE_SFTRST);
+	ret = clear_poll_bit(mxsfb->base + LCDC_CTRL, MODULE_SFTRST);
 	if (ret)
 		return ret;
 
-	return clear_poll_bit(mxsfb->base, MODULE_CLKGATE);
+	return clear_poll_bit(mxsfb->base + LCDC_CTRL, MODULE_CLKGATE);
 }
 
 static dma_addr_t mxsfb_get_fb_paddr(struct mxsfb_drm_private *mxsfb)