From mboxrd@z Thu Jan  1 00:00:00 1970
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: Re: [BUG] i2c-hid: ELAN Touchpad does not work on ASUS X580GD
Date: Fri, 18 May 2018 13:20:58 +0300
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To: Hans de Goede <hdegoede@redhat.com>, Jarkko Nikula <jarkko.nikula@linux.intel.com>, Chris Chiu <chiu@endlessm.com>
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On Fri, 2018-05-18 at 11:37 +0300, Andy Shevchenko wrote:
> On Fri, 2018-05-18 at 09:48 +0200, Hans de Goede wrote:
> 
> 
> > Could it be the i2c input clock definition in drivers/mfd/intel-
> > lpss-
> > pci.c
> > is also wrong for Apollo Lake (N3450) ?  There are lots of people
> > having
> > various issues with i2c attached touchpads on Apollo Lake devices,
> > this bug:
> > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1728244
> > 
> > Is sort of a collection bug for these. Various models laptops, lots
> > of
> > reporters. Note not sure thie is an i2c-designware issue, but it
> > would
> > be good to double check the input clock on Apollo Lake.
> > 
> > I've checked the datasheet and the datasheet mentions 133MHz as
> > "serial input clk" in the lpio_bxt_regs Registers Summary, which is
> > also part of the LPSS, no clk is mentioned in the "Summary of
> > DW_apb_i2c_mem_map_DW_apb_i2c_addr_block1 Registers".
> 
> The internal datasheet we have access to mentioned in this case for
> Broxton and Cannonlake together. So, your assumption might be quite
> close to the truth and the issue is inherited from Broxton.
> 

Hans, can your reporters try the following patch? Depending on the
result I may send it out ASAP.

--- a/drivers/mfd/intel-lpss-pci.c
+++ b/drivers/mfd/intel-lpss-pci.c
@@ -120,7 +120,7 @@ static struct property_entry apl_i2c_properties[] =
{
 };
 
 static const struct intel_lpss_platform_info apl_i2c_info = {
-       .clk_rate = 133000000,
+       .clk_rate = 216000000,
        .properties = apl_i2c_properties,
 };

-- 
Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Intel Finland Oy