在 2017-08-12 12:13,Chen-Yu Tsai 写道:
On Sat, Aug 12, 2017 at 11:07 AM,  <icen...@aosc.io> 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 <pl...@plaes.org>
---
 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

Oh, got it by reading other CCU clock types that has fixed postdiv.

Thanks!


ChenYu


(P.S. during developing R40 CCU driver I found that pll-periph0-sata
also needs this patch, so I'm rechecking it)


Maxime

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