Re: [PATCH] drm/msm/dsi: workaround for display enabled by bootloader

Rob Clark robdclark@gmail.com writes:

Bootloader enabled display, when the driver is built-in (rather than a module loaded after CCF/genpd disable "unused" clocks/powerdomains) causes problems since the driver thinks the clocks are off, but in fact they are on. This causes (for example) clk_set_rate() to fail.

A better solution would be to support display handover from bootloader, but that will require some CCF+genpd changes before that is possible. So until then, we need this workaround.

Hmm. Couldn't the clk_set_rate() just turn off the clock and then make the rate change when there are no refs on the clk currently?