Il 21/02/2018 10:20, Maxime Ripard ha scritto:
From: Maxime Ripard <maxime.rip...@free-electrons.com>

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

Make sure our rate is never changed.

Signed-off-by: Maxime Ripard <maxime.rip...@free-electrons.com>
Tested-by: Giulio Benetti <giulio.bene...@micronovasrl.com>

Tested on A20-LiNova1-4_3i-ctp with Mali r6p2 installed.
Before Mali changed dotclock, now it doesn't anymore.

---
  drivers/gpu/drm/sun4i/sun4i_tcon.c | 4 ++--
  1 file changed, 2 insertions(+), 2 deletions(-)

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 */
        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);

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