[lkml]   [2019]   [Jan]   [25]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RESEND PATCH v3 1/2] drivers: amba: Updates to component identification for driver matching.
Hi Mike,

Thanks for the patch.

BTW somehow I can't find the latest series in my inbox, so commenting
on this here.

Mathieu pointed me to this patch series.This solves CPU debug module
sharing same PID as ETM on MSM8996. I will be posting patch for CPU
debug UCI table soon.

But please find my one comment inline.

On 12/19/2018 3:29 AM, Mike Leach wrote:
> The CoreSight specification (ARM IHI 0029E), updates the ID register
> requirements for components on an AMBA bus, to cover both traditional
> ARM Primecell type devices, and newer CoreSight and other components.
> The Peripheral ID (PID) / Component ID (CID) pair is extended in certain
> cases to uniquely identify components. CoreSight components related to
> a single function can share Peripheral ID values, and must be further
> identified using a Unique Component Identifier (UCI). e.g. the ETM, CTI,
> PMU and Debug hardware of the A35 all share the same PID.


> +static const struct amba_id *
> +amba_lookup(const struct amba_id *table, struct amba_device *dev)
> +{
> while (table->mask) {
> - ret = (dev->periphid & table->mask) == table->id;
> - if (ret)
> - break;
> + if (((dev->periphid & table->mask) == table->id) &&
> + ((dev->cid != CORESIGHT_CID) ||
> + (amba_cs_uci_id_match(table, dev))))

Shouldn't the check be (dev->cid == CORESIGHT_CID) ?
Without this STM fails to probe on both SDM845 and MSM8996.

With this,

Tested-by: Sai Prakash Ranjan <>


QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member
of Code Aurora Forum, hosted by The Linux Foundation

 \ /
  Last update: 2019-01-25 08:21    [W:0.099 / U:1.068 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site