[PATCH v2 05/18] drm/sun4i: Force the mixer rate at 150MHz

Maxime Ripard
2017-11-27T15:41:29Z

It seems like the mixer can only run properly when clocked at 150MHz. In
order to have something more robust than simply a fire-and-forget
assigned-clocks-rate, let's put that in the code.

Signed-off-by: Maxime Ripard <maxime.ripard@free-electrons.com>
---
drivers/gpu/drm/sun4i/sun8i_mixer.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/drivers/gpu/drm/sun4i/sun8i_mixer.c b/drivers/gpu/drm/sun4i/sun8i_mixer.c
index cb193c5f1686..c0cdccf772a2 100644
--- a/drivers/gpu/drm/sun4i/sun8i_mixer.c
+++ b/drivers/gpu/drm/sun4i/sun8i_mixer.c
@@ -315,6 +315,13 @@ static int sun8i_mixer_bind(struct device *dev, struct device *master,
}
clk_prepare_enable(mixer->mod_clk);

+ /*
+ * It seems that we need to enforce that rate for whatever
+ * reason for the mixer to be functional. Make sure it's the
+ * case.
+ */
+ clk_set_rate(mixer->mod_clk, 150000000);
+
list_add_tail(&mixer->engine.list, &drv->engine_list);

/* Reset the registers */
--
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