Hi,
On Tue, Dec 26, 2017 at 10:12:25PM +1100, Jonathan Liu wrote:
> We should check if the best match has been set before comparing it.
>
> Fixes: 9c5681011a0c ("drm/sun4i: Add HDMI support")
> Signed-off-by: Jonathan Liu <net...@gmail.com>
> ---
> drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> b/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> index dc332ea56f6c..4d235e5ea31c 100644
> --- a/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> +++ b/drivers/gpu/drm/sun4i/sun4i_hdmi_tmds_clk.c
> @@ -102,7 +102,7 @@ static int sun4i_tmds_determine_rate(struct clk_hw *hw,
> goto out;
> }
>
> - if (abs(rate - rounded / i) <
> + if (!best_parent || abs(rate - rounded / i) <
Why is that causing any issue?
If best_parent is set to 0...
> abs(rate - best_parent / best_div)) {
... the value returned here is going to be rate, which is going to be
higher than the first part of the comparison meaning ...
> best_parent = rounded;
... that best_parent is going to be set there.
Maxime
--
Maxime Ripard, Free Electrons
Embedded Linux and Kernel engineering
http://free-electrons.com
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