linux-kernel - Re: [PATCH v4 3/6] Input: synaptics - Query min dimensions for fw v8.1

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Date:	Sat, 07 Feb 2015 09:50:57 +0100
From:	Hans de Goede <hdegoede@...hat.com>
To:	Benjamin Tissoires <benjamin.tissoires@...il.com>,
	Dmitry Torokhov <dmitry.torokhov@...il.com>,
	Daniel Martin <consume.noise@...il.com>
CC:	linux-input@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v4 3/6] Input: synaptics - Query min dimensions for fw
 v8.1

Hi,

On 02/06/2015 07:14 PM, Benjamin Tissoires wrote:
> 
> 
> On 02/06/2015 10:44 AM, Benjamin Tissoires wrote:
>> From: Daniel Martin <consume.noise@...il.com>
>>
>> Query the min dimensions even if the check
>>      SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7
>> fails, but we know that the firmware version 8.1 is safe.
>>
>> With that we don't need quirks for post-2013 models anymore as they
>> expose correct min and max dimensions.
>>
>> Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=91541
>>
>> Cc: stable@...r.kernel.org
>> Signed-off-by: Daniel Martin <consume.noise@...il.com>
>>    re-order the tests to check SYN_CAP_MIN_DIMENSIONS even on FW 8.1
>> Signed-off-by: Benjamin Tissoires <benjamin.tissoires@...hat.com>
>> ---
>> v2: Don't use a list for safe firmwares.
>>
>>   drivers/input/mouse/synaptics.c | 9 +++++++--
>>   1 file changed, 7 insertions(+), 2 deletions(-)
>>
>> diff --git a/drivers/input/mouse/synaptics.c b/drivers/input/mouse/synaptics.c
>> index 0485e6b..19dc87f 100644
>> --- a/drivers/input/mouse/synaptics.c
>> +++ b/drivers/input/mouse/synaptics.c
>> @@ -372,8 +372,13 @@ static int synaptics_resolution(struct psmouse *psmouse)
>>           }
>>       }
>>
>> -    if (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 &&
>> -        SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c)) {
>> +    if (SYN_CAP_MIN_DIMENSIONS(priv->ext_cap_0c) &&
>> +        (SYN_EXT_CAP_REQUESTS(priv->capabilities) >= 7 ||
>> +         /* Firmware v8.1 doesn't stand the previous checks, though has
>> +          * been proven to report correct min coordinates.
>> +          *     https://bugzilla.kernel.org/show_bug.cgi?id=91541 */
>> +         (SYN_ID_MAJOR(priv->identity) == 8 &&
>> +          SYN_ID_MINOR(priv->identity) == 1))) {
> 
> Hmm... this can be actually read as:
> +         SYN_ID_FULL(priv->identity) == 0x801)) {

And "checks" should be just "check" as the firmware check only is or-ed
together with the >= 7 check (which is intentional but the comment suggests
wrongly that it overrides both check_s_ .

Other then that the entire series looks good and is:

Acked-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans


> 
> Cheers,
> Benjamin
> 
>>           if (synaptics_send_cmd(psmouse, SYN_QUE_EXT_MIN_COORDS, resp)) {
>>               psmouse_warn(psmouse,
>>                        "device claims to have min coordinates query, but I'm not able to read it.\n");
>>
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