From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <linux-kernel-owner@vger.kernel.org>
Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand
	id S1755299AbcFGREg (ORCPT <rfc822;w@1wt.eu>);
	Tue, 7 Jun 2016 13:04:36 -0400
Received: from mail-wm0-f67.google.com ([74.125.82.67]:34126 "EHLO
	mail-wm0-f67.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org
	with ESMTP id S1754696AbcFGREe (ORCPT
	<rfc822;linux-kernel@vger.kernel.org>);
	Tue, 7 Jun 2016 13:04:34 -0400
Subject: Re: [PATCH v8 2/3] CMDQ: Mediatek CMDQ driver
To: HS Liao <hs.liao@mediatek.com>, Rob Herring <robh+dt@kernel.org>
References: <1464578397-29743-1-git-send-email-hs.liao@mediatek.com>
 <1464578397-29743-3-git-send-email-hs.liao@mediatek.com>
Cc: Daniel Kurtz <djkurtz@chromium.org>, Sascha Hauer <s.hauer@pengutronix.de>,
        devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org,
        linux-mediatek@lists.infradead.org, srv_heupstream@mediatek.com,
        Sascha Hauer <kernel@pengutronix.de>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        Nicolas Boichat <drinkcat@chromium.org>, CK HU <ck.hu@mediatek.com>,
        cawa cheng <cawa.cheng@mediatek.com>,
        Bibby Hsieh <bibby.hsieh@mediatek.com>, YT Shen <yt.shen@mediatek.com>,
        Daoyuan Huang <daoyuan.huang@mediatek.com>,
        Damon Chu <damon.chu@mediatek.com>,
        Josh-YC Liu <josh-yc.liu@mediatek.com>,
        Glory Hung <glory.hung@mediatek.com>,
        Jiaguang Zhang <jiaguang.zhang@mediatek.com>
From: Matthias Brugger <matthias.bgg@gmail.com>
Message-ID: <5756FE9B.6020107@gmail.com>
Date: Tue, 7 Jun 2016 19:04:27 +0200
User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101
 Thunderbird/38.7.0
MIME-Version: 1.0
In-Reply-To: <1464578397-29743-3-git-send-email-hs.liao@mediatek.com>
Content-Type: text/plain; charset=windows-1252; format=flowed
Content-Transfer-Encoding: 7bit
Sender: linux-kernel-owner@vger.kernel.org
List-ID: <linux-kernel.vger.kernel.org>
X-Mailing-List: linux-kernel@vger.kernel.org



On 30/05/16 05:19, HS Liao wrote:
> This patch is first version of Mediatek Command Queue(CMDQ) driver. The
> CMDQ is used to help read/write registers with critical time limitation,
> such as updating display configuration during the vblank. It controls
> Global Command Engine (GCE) hardware to achieve this requirement.
> Currently, CMDQ only supports display related hardwares, but we expect
> it can be extended to other hardwares for future requirements.
>
> Signed-off-by: HS Liao <hs.liao@mediatek.com>
> Signed-off-by: CK Hu <ck.hu@mediatek.com>
> ---

[...]

> +static void cmdq_handle_error_done(struct cmdq *cmdq,
> +				   struct cmdq_thread *thread, u32 irq_flag)
> +{
> +	struct cmdq_task *task, *tmp, *curr_task = NULL;
> +	u32 curr_pa;
> +	struct cmdq_cb_data cmdq_cb_data;
> +	bool err;
> +
> +	if (irq_flag & CMDQ_THR_IRQ_ERROR)
> +		err = true;
> +	else if (irq_flag & CMDQ_THR_IRQ_DONE)
> +		err = false;
> +	else
> +		return;
> +
> +	curr_pa = cmdq_thread_readl(thread, CMDQ_THR_CURR_ADDR);
> +
> +	list_for_each_entry_safe(task, tmp, &thread->task_busy_list,
> +				 list_entry) {
> +		if (curr_pa >= task->pa_base &&
> +		    curr_pa < (task->pa_base + task->command_size))
> +			curr_task = task;
> +		if (task->cb.cb) {
> +			cmdq_cb_data.err = curr_task ? err : false;
> +			cmdq_cb_data.data = task->cb.data;
> +			task->cb.cb(cmdq_cb_data);
> +		}

I think this is not right. If we got an IRQ_DONE, then the current task 
is in execution, we should not call the callback until it has finished.

Regards,
Matthias