From: Gwendal Grignou <gwendal@google.com>
To: Thierry Escande <thierry.escande@collabora.com>
Cc: Gwendal Grignou <gwendal@chromium.org>,
Benson Leung <bleung@chromium.org>,
Lee Jones <lee.jones@linaro.org>,
Jonathan Cameron <jic23@kernel.org>,
Enric Balletbo i Serra <enric.balletbo@collabora.com>,
Linux Kernel <linux-kernel@vger.kernel.org>,
dtor@chromium.org
Subject: Re: [PATCH v5 2/3] platform/chrome: cros_ec_lpc: Add support for Google Glimmer
Date: Wed, 6 Dec 2017 10:04:34 -0800 [thread overview]
Message-ID: <CAMHSBOXuAprZ5xWMeu64UD79k3nn2Q9GfePN6qOgw=FCKpfZeg@mail.gmail.com> (raw)
In-Reply-To: <e61244cb-d82f-dd85-ddff-9fa47dbbf0ab@collabora.com>
On Tue, Dec 5, 2017 at 1:55 PM, Thierry Escande
<thierry.escande@collabora.com> wrote:
> Hi Gwendal,
>
> On 01/12/2017 20:54, Gwendal Grignou wrote:
>>
>> This is not required.
>> Looking with dmidecode, Glimmer reports:
>> ...
>> BIOS Information
>> Vendor: coreboot
>> Version: Google_Glimmer.5216.198.19
>> ...
>>
>> Therefore, the first entry of cros_ec_lpc_dmi_table will match.
>
>
> These DMI vendor/version strings are not exposed when booting in legacy mode
> using SeaBIOS on the Yoga 11e. Instead it matches with the pair
> GOOGLE/Glimmer. So this patch is needed for booting a vanilla kernel in
> legacy mode.
Good point. Given we will have the same issue with TianoCore, we have
to use a DMI product match. Newer ACPI based chromebooks registers
their EC dynamically , but looking at cros_ec_lpc.c, all registrations
are gated on a dmi table match. This is only required for older
devices.
In the meantime,
Reviewed-by: Gwendal Grignou <gwendal@chromium.org>
> Regards,
> Thierry
>
>
>>
>> Gwendal.
>>
>> On Fri, Dec 1, 2017 at 5:42 AM, Thierry Escande
>> <thierry.escande@collabora.com> wrote:
>>>
>>> This patch adds device information to the DMI table of the cros_ec_lpc
>>> driver for Google Glimmer devices. Since Google BIOS does not enumerate
>>> devices in the LPC bus, the cros_ec_lpc driver checks for system
>>> compatibility and registers the cros_ec device itself.
>>>
>>> Signed-off-by: Thierry Escande <thierry.escande@collabora.com>
>>> ---
>>> drivers/platform/chrome/cros_ec_lpc.c | 7 +++++++
>>> 1 file changed, 7 insertions(+)
>>>
>>> diff --git a/drivers/platform/chrome/cros_ec_lpc.c
>>> b/drivers/platform/chrome/cros_ec_lpc.c
>>> index 0b26a09..4a2fc55 100644
>>> --- a/drivers/platform/chrome/cros_ec_lpc.c
>>> +++ b/drivers/platform/chrome/cros_ec_lpc.c
>>> @@ -365,6 +365,13 @@ static const struct dmi_system_id
>>> cros_ec_lpc_dmi_table[] __initconst = {
>>> DMI_MATCH(DMI_PRODUCT_NAME, "Peppy"),
>>> },
>>> },
>>> + {
>>> + /* x86-glimmer, the Lenovo Thinkpad Yoga 11e. */
>>> + .matches = {
>>> + DMI_MATCH(DMI_SYS_VENDOR, "GOOGLE"),
>>> + DMI_MATCH(DMI_PRODUCT_NAME, "Glimmer"),
>>> + },
>>> + },
>>> { /* sentinel */ }
>>> };
>>> MODULE_DEVICE_TABLE(dmi, cros_ec_lpc_dmi_table);
>>> --
>>> 2.7.4
>>>
>
next prev parent reply other threads:[~2017-12-06 18:04 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2017-12-01 13:42 [PATCH v5 0/3] platform/chrome: Support for cros_ec_accel_legacy driver Thierry Escande
2017-12-01 13:42 ` [PATCH v5 1/3] platform/chrome: cros_ec_lpc: Register the driver if ACPI entry is missing Thierry Escande
2017-12-01 19:49 ` Gwendal Grignou
2017-12-16 6:12 ` Benson Leung
2017-12-16 6:03 ` Benson Leung
2017-12-16 6:04 ` Benson Leung
2017-12-01 13:42 ` [PATCH v5 2/3] platform/chrome: cros_ec_lpc: Add support for Google Glimmer Thierry Escande
2017-12-01 19:54 ` Gwendal Grignou
2017-12-05 21:55 ` Thierry Escande
2017-12-06 18:04 ` Gwendal Grignou [this message]
2017-12-16 6:10 ` Benson Leung
2017-12-01 13:42 ` [PATCH v5 3/3] platform/chrome: Register cros_ec_accel_legacy driver Thierry Escande
2017-12-01 20:00 ` Gwendal Grignou
2017-12-07 9:31 ` Lee Jones
2018-01-18 8:05 ` Gwendal Grignou
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