On Sat, Aug 12, 2017 at 11:07 AM, <icenowy@xxxxxxx> wrote: > 在 2017-07-17 16:52,Maxime Ripard 写道: >> >> On Fri, Jul 14, 2017 at 05:49:23PM +0300, Priit Laes wrote: >>> >>> SATA clock on sun4i/sun7i is of type (parent) / M / 6 where >>> 6 is fixed post-divider. >>> >>> Signed-off-by: Priit Laes <plaes@xxxxxxxxx> >>> --- >>> drivers/clk/sunxi-ng/ccu_div.c | 15 +++++++++++++-- >>> drivers/clk/sunxi-ng/ccu_div.h | 3 ++- >>> 2 files changed, 15 insertions(+), 3 deletions(-) >>> >>> diff --git a/drivers/clk/sunxi-ng/ccu_div.c >>> b/drivers/clk/sunxi-ng/ccu_div.c >>> index c0e5c10..744502a 100644 >>> --- a/drivers/clk/sunxi-ng/ccu_div.c >>> +++ b/drivers/clk/sunxi-ng/ccu_div.c >>> @@ -21,6 +21,9 @@ static unsigned long ccu_div_round_rate(struct >>> ccu_mux_internal *mux, >>> { >>> struct ccu_div *cd = data; >>> >>> + if (cd->common.features & CCU_FEATURE_FIXED_POSTDIV) >>> + rate *= cd->fixed_post_div; >>> + >>> return divider_round_rate_parent(&cd->common.hw, parent, >>> rate, parent_rate, >>> cd->div.table, cd->div.width, >> >> >> >> You still haven't addressed the biggest issue with this patch, see: >> https://patchwork.kernel.org/patch/9825565/ > > > I think he has already did the changes suggested in the review. Nope. Only half of it is fixed. First you "unapply" the post-divider, i.e. multiply the rate by the divider. Then you pass it to divider_round_rate_parent. You still have to reapply the divider to the result. This last part is missing. This means the clock rate returned by ccu_div_round_rate is going to be off. Instead the return statement should be return divider_round_rate_parent(...) / cd->fixed_post_div ChenYu > > (P.S. during developing R40 CCU driver I found that pll-periph0-sata > also needs this patch, so I'm rechecking it) > >> >> Maxime >> >> _______________________________________________ >> linux-arm-kernel mailing list >> linux-arm-kernel@xxxxxxxxxxxxxxxxxxx >> http://lists.infradead.org/mailman/listinfo/linux-arm-kernel > > > -- > You received this message because you are subscribed to the Google Groups > "linux-sunxi" group. > To unsubscribe from this group and stop receiving emails from it, send an > email to linux-sunxi+unsubscribe@xxxxxxxxxxxxxxxx. > For more options, visit https://groups.google.com/d/optout. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html