From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1952229AbdEAKcD (ORCPT ); Mon, 1 May 2017 06:32:03 -0400 Received: from relay1.mentorg.com ([192.94.38.131]:60780 "EHLO relay1.mentorg.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1166347AbdEAKby (ORCPT ); Mon, 1 May 2017 06:31:54 -0400 From: To: CC: , , Jiada Wang Subject: [PATCH linux-next v2 0/1] improve imx spi performance Date: Mon, 1 May 2017 03:31:43 -0700 Message-ID: <1493634704-3545-1-git-send-email-jiada_wang@mentor.com> X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Jiada Wang previously burst length (BURST_LENGTH) is always set to equal to bits_per_word, causes a 10us gap between each word in transfer, which significantly affects performance. This patch set uses 32 bits tranfser to simulate lowers bits transfer, and by set burst length to maximum possible value to reduce number of gaps in PIO transfers. Jiada Wang (1): spi: imx: dynamic burst length adjust for PIO mode Changes from v2: used cpu_to_* functions, to ensure this patch works for both little & big endian kernel. other minor fix. drivers/spi/spi-imx.c | 157 +++++++++++++++++++++++++++++++++++++++++++++++--- 1 file changed, 149 insertions(+), 8 deletions(-) -- 2.7.4