drm/stm: ltdc: remove clk_round_rate comment

Clk_round_rate returns rounded clock without changing
the hardware in any way.
This function couldn't replace set_rate/get_rate calls.
Todo comment has been removed & a new log inserted.
Signed-off-by: Yannick Fertré <yannick.fertre@st.com>
Signed-off-by: Benjamin Gaignard <benjamin.gaignard@linaro.org>
Link: https://patchwork.freedesktop.org/patch/msgid/1557500600-19771-1-git-send-email-yannick.fertre@st.com

drivers/gpu/drm/stm/ltdc.c

@@ -507,20 +507,16 @@ static bool ltdc_crtc_mode_fixup(struct drm_crtc *crtc,
 	struct ltdc_device *ldev = crtc_to_ltdc(crtc);
 	int rate = mode->clock * 1000;
 
-	/*
-	 * TODO clk_round_rate() does not work yet. When ready, it can
-	 * be used instead of clk_set_rate() then clk_get_rate().
-	 */
-
-	clk_disable(ldev->pixel_clk);
 	if (clk_set_rate(ldev->pixel_clk, rate) < 0) {
 		DRM_ERROR("Cannot set rate (%dHz) for pixel clk\n", rate);
 		return false;
 	}
-	clk_enable(ldev->pixel_clk);
 
 	adjusted_mode->clock = clk_get_rate(ldev->pixel_clk) / 1000;
 
+	DRM_DEBUG_DRIVER("requested clock %dkHz, adjusted clock %dkHz\n",
+			 mode->clock, adjusted_mode->clock);
+
 	return true;
 }