[PATCH 6/9] drm: bridge/dw_hdmi: adjust pixel clock values in N calculation
Russell King - ARM Linux
linux at arm.linux.org.uk
Sat Sep 5 01:31:08 PDT 2015
On Fri, Sep 04, 2015 at 07:03:11PM -0700, Doug Anderson wrote:
> AKA: just replace your entire "compute_n" function with:
> return (128 * freq) / 1000;
> ...and it's 100% simpler _and_ gets you a (marginally) better rate
> (assuming you really have 22.175000). If it was just about a
> 32000.222 vs 32000 I'd not be saying anything right now. It's about
> adding complexity.
No. It doesn't work for all cases. Do the calculations for every
sample rate in those tables in the HDMI spec, and you'll find out
FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up
according to speedtest.net.
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