On 10/27, Archit Taneja wrote: > The DSI/HDMI PLLs in MSM require resources like interface clocks, power > domains to be enabled before we can access their registers. > > The clock framework doesn't have a mechanism at the moment where we can > tie such resources to a clock, so we make sure that the KMS driver enables > these resources whenever a PLL is expected to be in use. > > One place where we can't ensure the resource dependencies are met is when > the clock framework tries to disable unused clocks. The KMS driver doesn't > know when the clock framework calls the is_enabled clk_op, and hence can't > enable interface clocks/power domains beforehand. > > We set the CLK_IGNORE_UNUSED flag for PLL clocks for now. This needs to be > revisited, since bootloaders can enable display, and we would want to > disable the PLL clocks if there isn't a display driver using them. > > Cc: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> > Signed-off-by: Archit Taneja <architt@xxxxxxxxxxxxxx> > --- Acked-by: Stephen Boyd <sboyd@xxxxxxxxxxxxxx> -- Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project -- To unsubscribe from this list: send the line "unsubscribe linux-arm-msm" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
