| Message ID | 20200107165957.672435-2-maxime@cerno.tech (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | [v2,1/2] drm/sun4i: backend: Make sure we enforce the clock rate | expand |
On Wed, Jan 08, 2020 at 01:28:34AM +0800, Chen-Yu Tsai wrote: > On Wed, Jan 8, 2020 at 1:00 AM Maxime Ripard <maxime@cerno.tech> wrote: > > > > The DRC needs to run at 300MHz to be functional. This was done so far > > using assigned-clocks in the device tree, but that is easy to forget, and > > dosen't provide any other guarantee than the rate is going to be roughly > > the one requested at probe time. > > > > Therefore it's pretty fragile, so let's just use the exclusive clock API to > > enforce it. > > > > Signed-off-by: Maxime Ripard <maxime@cerno.tech> > > Reviewed-by: Chen-Yu Tsai <wens@csie.org> APplied both, thanks! Maxime
diff --git a/drivers/gpu/drm/sun4i/sun6i_drc.c b/drivers/gpu/drm/sun4i/sun6i_drc.c index f7ab72244796..4fbe9a6b5182 100644 --- a/drivers/gpu/drm/sun4i/sun6i_drc.c +++ b/drivers/gpu/drm/sun4i/sun6i_drc.c @@ -56,6 +56,13 @@ static int sun6i_drc_bind(struct device *dev, struct device *master, ret = PTR_ERR(drc->mod_clk); goto err_disable_bus_clk; } + + ret = clk_set_rate_exclusive(drc->mod_clk, 300000000); + if (ret) { + dev_err(dev, "Couldn't set the module clock frequency\n"); + goto err_disable_bus_clk; + } + clk_prepare_enable(drc->mod_clk); return 0; @@ -72,6 +79,7 @@ static void sun6i_drc_unbind(struct device *dev, struct device *master, { struct sun6i_drc *drc = dev_get_drvdata(dev); + clk_rate_exclusive_put(drc->mod_clk); clk_disable_unprepare(drc->mod_clk); clk_disable_unprepare(drc->bus_clk); reset_control_assert(drc->reset);
The DRC needs to run at 300MHz to be functional. This was done so far using assigned-clocks in the device tree, but that is easy to forget, and dosen't provide any other guarantee than the rate is going to be roughly the one requested at probe time. Therefore it's pretty fragile, so let's just use the exclusive clock API to enforce it. Signed-off-by: Maxime Ripard <maxime@cerno.tech> --- Changes from v1: - Add test on the clk_set_rate_exclusive return value --- drivers/gpu/drm/sun4i/sun6i_drc.c | 8 ++++++++ 1 file changed, 8 insertions(+)