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drm/sun4i: Protect the TCON pixel clocks 

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 <giulio.benetti@micronovasrl.com>
Reviewed-by: Chen-Yu Tsai <wens@csie.org>
Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
Link: https://patchwork.freedesktop.org/patch/msgid/d5224d2e81ecf73dc09f234e580ada52c00eaee3.1519204731.git-series.maxime.ripard@bootlin.com
This commit is contained in:
Maxime Ripard 2018-02-21 10:20:27 +01:00 committed by Maxime Ripard
parent 80b79e31c4
commit 79d103a565
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GPG Key ID: D2B4C094214DAF74
1 changed files with 2 additions and 2 deletions
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4
drivers/gpu/drm/sun4i/sun4i_tcon.c
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@ -260,7 +260,7 @@ 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,
@ -421,7 +421,7 @@ 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);