video: da8xx-fb: report correct pixclock

Update "var" pixclock with the value that is configurable in hardware.
This lets user know the actual pixclock.

Signed-off-by: Afzal Mohammed <afzal@ti.com>
Signed-off-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>

drivers/video/da8xx-fb.c

@@ -686,6 +686,15 @@ static inline unsigned da8xx_fb_calc_clk_divider(struct da8xx_fb_par *par,
 	return par->lcd_fck_rate / (PICOS2KHZ(pixclock) * 1000);
 }
 
+static inline unsigned da8xx_fb_round_clk(struct da8xx_fb_par *par,
+					  unsigned pixclock)
+{
+	unsigned div;
+
+	div = da8xx_fb_calc_clk_divider(par, pixclock);
+	return KHZ2PICOS(par->lcd_fck_rate / (1000 * div));
+}
+
 static inline void da8xx_fb_config_clk_divider(unsigned div)
 {
 	/* Configure the LCD clock divisor. */
@@ -962,6 +971,8 @@ static int fb_check_var(struct fb_var_screeninfo *var,
 	if (var->yres + var->yoffset > var->yres_virtual)
 		var->yoffset = var->yres_virtual - var->yres;
 
+	var->pixclock = da8xx_fb_round_clk(par, var->pixclock);
+
 	return err;
 }