Re: [PATCH] remoteproc: qcom: Introduce Hexagon V5 based WCSS driver
From: Sricharan R
Date: Thu Jun 07 2018 - 02:36:16 EST
On 6/7/2018 11:18 AM, Bjorn Andersson wrote:
> On Wed 06 Jun 22:29 PDT 2018, Sricharan R wrote:
>> Hi Bjorn,
>> On 6/7/2018 9:54 AM, Bjorn Andersson wrote:
>>> On Wed 06 Jun 21:11 PDT 2018, Vinod wrote:
>>>> On 06-06-18, 09:17, Bjorn Andersson wrote:
>>>>> On Tue 05 Jun 05:56 PDT 2018, Sricharan R wrote:
>>>>>> Hi Vinod,
>>>>>> On 6/5/2018 11:49 AM, Vinod wrote:
>>>>>>> On 05-06-18, 11:12, Sricharan R wrote:
>>> If we ignore SMD for a while we have the following combinations:
>>> y y - valid
>>> y m - valid
>>> y n - valid
>>> m y - link failure (invalid)
>>> m m - valid
>>> m n - valid
>>> n y - valid (platform uses wcss, but not glink)
>>> n m - valid (-----"-----)
>>> n n - valid
>>> So to distill this we have the two valid cases:
>>> module/no if RPMSG_QCOM_GLINK_SMEM=m
>>> yes/module/no if RPMSG_QCOM_GLINK_SMEM=y
>>> and the way you express that in Kconfig is the somewhat awkward
>>> depends on RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n
>> ok, Having "depends on RPMSG_QCOM_GLINK_SMEM" takes care of the
>> first 6 cases in the above list.
>> But just was thinking that by allowing the last three combinations,
>> there is a chance that some config that really needs GLINK_SMEM and WCSS,
>> but selects only Q6V5_WCSS and misses to select GLINK_SMEM,
>> would still built and make it non-functional, right ?
> It would allow you to compile a kernel with GLINk disabled that in
> runtime loads a firmware that depends on GLINK being there.
> As it would be convenient to thereby state that "WCSS always depends on
> GLINK" we can make the analog to 410 where "MSS always depends on SMD",
> which isn't true when the same driver is reused on e.g. 845 - which
> uses GLINK.
> So my recommendation is that we stick with Kconfig options that
> describes the build time dependencies of this particular driver, rather
> than its runtime dependencies in a particular platform.
ok thanks. It sort of gave an impression that the last three combinations in
the above list was only for "compile testing". Hence was thinking to have
(COMPILE_TEST && RPMSG_QCOM_GLINK_SMEM=n). Anyways for WCSS, would drop
the dependency on SMD and just have RPMSG_QCOM_GLINK_SMEM || RPMSG_QCOM_GLINK_SMEM=n.
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