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| author | Ondrej Jirman <megous@megous.com> | 2018-03-10 12:05:11 +0100 |
|---|---|---|
| committer | Maxime Ripard <maxime.ripard@bootlin.com> | 2018-03-12 10:07:17 +0100 |
| commit | 7035046d6d02d455325c5d0328bcc8a0b5dd96b0 (patch) | |
| tree | 636eb6ac5d2643b3a16c1856832791cc1e76599b /drivers | |
| parent | Merge branch 'drm-fixes-4.16' of git://people.freedesktop.org/~agd5f/linux in... (diff) | |
| download | linux-7035046d6d02d455325c5d0328bcc8a0b5dd96b0.tar.xz linux-7035046d6d02d455325c5d0328bcc8a0b5dd96b0.zip | |
drm/sun4i: Fix exclusivity of the TCON clocks
Currently the exclusivity is enabled when the rate is set by
the mode setting functions. These functions are called by
mode_set_nofb callback of drm_crc_helper. Then exclusivity
is disabled when tcon is disabled by atomic_disable
callback.
What happens is that mode_set_nofb can be called once when
mode changes, and afterwards the system can call atomic_enable
and atomic_disable multiple times without further calls to
mode_set_nofb.
This happens:
mode_set_nofb - clk exclusivity is enabled
atomic_enable
atomic_disable - clk exclusivity is disabled
atomic_enable
atomic_disable - clk exclusivity is already disabled, leading to WARN
in clk_rate_exclusive_put
Solution is to enable exclusivity in sun4i_tcon_channel_set_status.
Signed-off-by: Ondrej Jirman <megous@megous.com>
Cc: Jernej Skrabec <jernej.skrabec@siol.net>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180310110511.14697-1-megous@megous.com
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/gpu/drm/sun4i/sun4i_tcon.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun4i_tcon.c index 2de586b7c98b..a818ca491605 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -103,6 +103,7 @@ static void sun4i_tcon_channel_set_status(struct sun4i_tcon *tcon, int channel, if (enabled) { clk_prepare_enable(clk); + clk_rate_exclusive_get(clk); } else { clk_rate_exclusive_put(clk); clk_disable_unprepare(clk); @@ -262,7 +263,7 @@ static void sun4i_tcon0_mode_set_common(struct sun4i_tcon *tcon, const struct drm_display_mode *mode) { /* Configure the dot clock */ - clk_set_rate_exclusive(tcon->dclk, mode->crtc_clock * 1000); + clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); /* Set the resolution */ regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, @@ -423,7 +424,7 @@ static void sun4i_tcon1_mode_set(struct sun4i_tcon *tcon, WARN_ON(!tcon->quirks->has_channel_1); /* Configure the dot clock */ - clk_set_rate_exclusive(tcon->sclk1, mode->crtc_clock * 1000); + clk_set_rate(tcon->sclk1, mode->crtc_clock * 1000); /* Adjust clock delay */ clk_delay = sun4i_tcon_get_clk_delay(mode, 1); |