Messages in this thread | | | From | "Chew, Chiau Ee" <> | Subject | RE: [PATCH 2/2] i2c: designware-pci: set ideal HCNT, LCNT and SDA hold time value | Date | Mon, 10 Mar 2014 11:34:49 +0000 |
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> -----Original Message----- > From: Wolfram Sang [mailto:wsa@the-dreams.de] > Sent: Sunday, March 09, 2014 5:04 PM > To: Chew, Chiau Ee > Cc: Mika Westerberg; linux-i2c@vger.kernel.org; linux-kernel@vger.kernel.org > Subject: Re: [PATCH 2/2] i2c: designware-pci: set ideal HCNT, LCNT and SDA > hold time value > > On Fri, Mar 07, 2014 at 10:12:51PM +0800, Chew Chiau Ee wrote: > > From: Chew, Chiau Ee <chiau.ee.chew@intel.com> > > > > On Intel BayTrail, there was case whereby the resulting fast mode bus > > speed becomes slower (~20% slower compared to expected speed) if using > > the HCNT/LCNT calculated in the core layer. Thus, this patch is added > > to allow pci glue layer to pass in optimal HCNT/LCNT/SDA hold time > > values to core layer since the core layer supports cofigurable > > HCNT/LCNT/SDA hold time values now. > > > > Signed-off-by: Chew, Chiau Ee <chiau.ee.chew@intel.com> > > Can you make use of those instead? > > u32 sda_falling_time; > u32 scl_falling_time; > > This is more consistent with using sda_hold_time and lets them have a common > (and more readable) unit.
Would like to clarify on your statement above. So you are suggesting to change the following variable name in the code? As in: "u32 ss_hcnt;" to "u32 ss_scl_rising_time" "u32 fs_hcnt;" to "u32 fs_scl_rising_time" "u32 ss_lcnt;" to "u32 ss_scl_falling_time" "u32 fs_lcnt;" to " u32 fs_scl_falling_time" "u32 sda_hold;" to "u32 sda_hold_time"
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