From: addy ke <addy.ke-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
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Subject: Re: [PATCH 1/2] spi/rockchip: fix bug that case spi can't go as fast as slave request
Date: Thu, 16 Oct 2014 17:16:02 +0800 [thread overview]
Message-ID: <543F8CD2.1010302@rock-chips.com> (raw)
In-Reply-To: <20141015130452.GD27755-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
hi, Mark
On 2014/10/15 21:04, Mark Brown wrote:
> On Wed, Oct 15, 2014 at 07:25:49PM +0800, Addy Ke wrote:
>
>> + if (WARN_ON(rs->speed > MAX_SCLK_OUT))
>> + rs->speed = MAX_SCLK_OUT;
>> +
>> + /* the minimum divsor is 2 */
>> + if (rs->max_freq < 2 * rs->speed) {
>> + clk_set_rate(rs->spiclk, 2 * rs->speed);
>> + rs->max_freq = clk_get_rate(rs->spiclk);
>> + }
>
> I'll apply this but you should be checking the return code from
> clk_set_rate() here, please send a followup patch doing that. It might
If clk_set_rate return error, do I only put dev_warn here or return error value to spi core?
> also be worth consdering just setting the rate unconditionally here, it
> seems like it should make things simpler.
>
I think we need.
If we set the rate unconditionally here, clk_set_rate() will be executed in each spi transfer.
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next prev parent reply other threads:[~2014-10-16 9:16 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-15 11:25 [PATCH 0/2] spi: fix two bugs Addy Ke
2014-10-15 11:25 ` [PATCH 1/2] spi/rockchip: fix bug that case spi can't go as fast as slave request Addy Ke
2014-10-15 13:04 ` Mark Brown
[not found] ` <20141015130452.GD27755-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-10-16 9:16 ` addy ke [this message]
2014-10-16 9:34 ` Mark Brown
2014-10-16 9:58 ` addy ke
2014-10-16 10:26 ` Mark Brown
2014-10-15 11:26 ` [PATCH 2/2] spi/rockchip: fix bug that cause spi transfer timed out in DMA duplex mode Addy Ke
[not found] ` <1413372378-4309-1-git-send-email-addy.ke-TNX95d0MmH7DzftRWevZcw@public.gmane.org>
2014-10-15 13:05 ` Mark Brown
[not found] ` <20141015130547.GE27755-GFdadSzt00ze9xe1eoZjHA@public.gmane.org>
2014-10-16 9:26 ` addy ke
2014-10-16 9:34 ` Mark Brown
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