[v2,03/10] drm/sun4i: Protect the TCON pixel clocks

Commit Message

Giulio Benetti Feb. 23, 2018, 2:05 p.m. UTC

From: Maxime Ripard <[e-mail]>

Both TCON clocks are very sensitive to clock changes, since any change
might lead to improper timings.

Make sure our rate is never changed.

Tested-by: Giulio Benetti <[e-mail]>
Signed-off-by: Maxime Ripard <[e-mail]>
---
  drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

  	regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG,
@@ -419,7 +419,7 @@ static void sun4i_tcon1_mode_set(struct sun4i_tcon 
*tcon,
  	WARN_ON(!tcon->quirks->has_channel_1);

  	/* Configure the dot clock */
-	clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000);
+	clk_set_rate_exclusive(tcon->sclk1, mode->crtc_clock * 1000);

  	/* Adjust clock delay */
  	clk_delay = sun4i_tcon_get_clk_delay(mode, 1);

Patch

diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c 
b/drivers/gpu/drm/sun4i/sun4i_tcon.c
index b73acab74867..cbe87cee13d1 100644
--- a/drivers/gpu/drm/sun4i/sun4i_tcon.c
+++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c
@@ -261,7 +261,7 @@  static void sun4i_tcon0_mode_set_common(struct 
sun4i_tcon *tcon,
  					const struct drm_display_mode *mode)
  {
  	/* Configure the dot clock */
-	clk_set_rate(tcon->dclk, mode->crtc_clock * 1000);
+	clk_set_rate_exclusive(tcon->dclk, mode->crtc_clock * 1000);

  	/* Set the resolution */