raspi/linux
1
0
Fork 1
mirror of https://github.com/raspberrypi/linux.git synced 2025-12-06 10:00:17 +00:00
Code Issues Projects Releases Wiki Activity

drm/sun4i: tcon: Prepare and enable TCON channel 0 clock at init

Browse Source 
[ Upstream commit b14e945bda ]

When initializing clocks, a reference to the TCON channel 0 clock is
obtained. However, the clock is never prepared and enabled later.
Switching from simplefb to DRM actually disables the clock (that was
usually configured by U-Boot) because of that.

On the V3s, this results in a hang when writing to some mixer registers
when switching over to DRM from simplefb.

Fix this by preparing and enabling the clock when initializing other
clocks. Waiting for sun4i_tcon_channel_enable to enable the clock is
apparently too late and results in the same mixer register access hang.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190131132550.26355-1-paul.kocialkowski@bootlin.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Paul Kocialkowski
2019-01-31 14:25:50 +01:00
committed by Greg Kroah-Hartman
parent ae26a7109c
commit 7cf4466df6
1 changed files with 2 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/gpu/drm/sun4i/sun4i_tcon.c
View File

@@ -672,6 +672,7 @@ static int sun4i_tcon_init_clocks(struct device *dev,
return PTR_ERR(tcon->sclk0); return PTR_ERR(tcon->sclk0);
} }
} }
clk_prepare_enable(tcon->sclk0);
if (tcon->quirks->has_channel_1) { if (tcon->quirks->has_channel_1) {
tcon->sclk1 = devm_clk_get(dev, "tcon-ch1"); tcon->sclk1 = devm_clk_get(dev, "tcon-ch1");
@@ -686,6 +687,7 @@ static int sun4i_tcon_init_clocks(struct device *dev,
static void sun4i_tcon_free_clocks(struct sun4i_tcon *tcon) static void sun4i_tcon_free_clocks(struct sun4i_tcon *tcon)
{ {
clk_disable_unprepare(tcon->sclk0);
clk_disable_unprepare(tcon->clk); clk_disable_unprepare(tcon->clk);
} }