From mboxrd@z Thu Jan  1 00:00:00 1970
From: Venu Byravarasu <vbyravarasu@nvidia.com>
Subject: RE: [PATCH RFC V2 33/46] mmc: mmc_test: Disable Command Queue while
 mmc_test is used
Date: Fri, 10 Jun 2016 10:59:58 +0000
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To: Adrian Hunter <adrian.hunter@intel.com>, Ulf Hansson <ulf.hansson@linaro.org>
Cc: linux-mmc <linux-mmc@vger.kernel.org>, Alex Lemberg <alex.lemberg@sandisk.com>, Mateusz Nowak <mateusz.nowak@intel.com>, Yuliy Izrailov <Yuliy.Izrailov@sandisk.com>, Jaehoon Chung <jh80.chung@samsung.com>, Dong Aisheng <dongas86@gmail.com>, Das Asutosh <asutoshd@codeaurora.org>, Zhangfei Gao <zhangfei.gao@gmail.com>, Sujit Reddy Thumma <sthumma@codeaurora.org>, Dorfman Konstantin <kdorfman@codeaurora.org>, David Griego <david.griego@linaro.org>, Sahitya Tummala <stummala@codeaurora.org>, Harjani Ritesh <riteshh@codeaurora.org>, Venu Byravarasu <vbyravarasu@nvidia.com>



> -----Original Message-----
> From: linux-mmc-owner@vger.kernel.org [mailto:linux-mmc-
> owner@vger.kernel.org] On Behalf Of Adrian Hunter
> Sent: Friday, June 10, 2016 4:15 PM
> To: Ulf Hansson
> Cc: linux-mmc; Alex Lemberg; Mateusz Nowak; Yuliy Izrailov; Jaehoon Chung;
> Dong Aisheng; Das Asutosh; Zhangfei Gao; Sujit Reddy Thumma; Dorfman
> Konstantin; David Griego; Sahitya Tummala; Harjani Ritesh
> Subject: [PATCH RFC V2 33/46] mmc: mmc_test: Disable Command Queue
> while mmc_test is used
> 
> Normal read and write commands may not be used while the command
> queue is enabled.

CQ may not be efficient when single rd/wr commands get issued with variable delays in between.
In such situations, CQ preparation for individual rd/wr cmds would be an unnecessary overhead. 
Hence even when CQ is supported, prefer CQ only when more than 1 data cmds are to be issued to device.

> 
> Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
> ---
> 
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