lkml.org 
[lkml]   [2021]   [Jul]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [PATCH 8/8] i2c: mediatek: modify bus speed calculation formula
From
Date
On Thu, 2021-07-15 at 15:09 +0800, Tzung-Bi Shih wrote:
> On Thu, Jul 15, 2021 at 10:32 AM Kewei Xu <kewei.xu@mediatek.com> wrote:
> > When clock-div is 0 or greater than 1, the bus speed
> > calculated by the old speed calculation formula will be
> > larger than the target speed. So we update the formula.
> The patch sounds like a fix up. Need a "Fixes" tag.
>
> > for (clk_div = 1; clk_div <= max_clk_div; clk_div++) {
> > clk_src = parent_clk / clk_div;
> > + i2c->ac_timing.inter_clk_div = clk_div - 1;
> Using the way to pass the parameter "inter_clk_div" to
> mtk_i2c_calculate_speed() looks like a hack. inter_clk_div is set
> again[1] next to the for loop.
>
> [1]: https://elixir.bootlin.com/linux/v5.14-rc1/source/drivers/i2c/busses/i2c-mt65xx.c#L831
>
>
>
> I have no domain knowledge of what/how the patch fixes. But if this
> is a standalone fixup patch, suggest separating to an independent
> patch.

Hi Tzung-Bi,

1. This Patch is not for fixing previous commit,it is just for the bad
speed formula.

2. I will fix this problem according to your suggestion in the next
patch.

Thanks
Kewei
\
 
 \ /
  Last update: 2021-07-16 11:55    [W:0.036 / U:0.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site