From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752295AbeDKDrp (ORCPT ); Tue, 10 Apr 2018 23:47:45 -0400 Received: from m12-18.163.com ([220.181.12.18]:46859 "EHLO m12-18.163.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752234AbeDKDrn (ORCPT ); Tue, 10 Apr 2018 23:47:43 -0400 From: sxauwsk To: Mark Brown Cc: linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org, sxauwsk@163.com, guojian , wangshikai Subject: [PATCH] spi: cadence: Add usleep_range() for cdns_spi_fill_tx_fifo() Date: Mon, 9 Apr 2018 19:16:50 +0800 Message-Id: <1523272610-49116-1-git-send-email-sxauwsk@163.com> X-Mailer: git-send-email 1.7.9.5 X-CM-TRANSID: EsCowACXsdBEhc1atNCREg--.17491S3 X-Coremail-Antispam: 1Uf129KBjvdXoWrtw1rtF1kuw1UZF13Zw47Arb_yoWfAFbEvF 1UAws7Gay5JF9FyFy29rsrZryjva1Fqr1kuF1qqas8JwsrZan2vrn5Zr1DKw17Zw4UuFnx Zr1vga4DArsxKjkaLaAFLSUrUUUUUb8apTn2vfkv8UJUUUU8Yxn0WfASr-VFAUDa7-sFnT 9fnUUvcSsGvfC2KfnxnUUI43ZEXa7xRRJ3ktUUUUU== X-Originating-IP: [113.140.17.238] X-CM-SenderInfo: 5v0d34lvn6il2tof0z/xtbBZA8lJlQG-7C1lAAAsU Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org In case of xspi work in busy condition, may send bytes failed. Add one bytes delay Signed-off-by: sxauwsk Signed-off-by: guojian Signed-off-by: wangshikai --- drivers/spi/spi-cadence.c | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/drivers/spi/spi-cadence.c b/drivers/spi/spi-cadence.c index 5c9516a..66ae055 100644 --- a/drivers/spi/spi-cadence.c +++ b/drivers/spi/spi-cadence.c @@ -313,6 +313,12 @@ static void cdns_spi_fill_tx_fifo(struct cdns_spi *xspi) while ((trans_cnt < CDNS_SPI_FIFO_DEPTH) && (xspi->tx_bytes > 0)) { + + /* When xspi in busy condition, bytes may send failed, + * caused communication failure so add one byte delay + */ + usleep_range(10, 20); + if (xspi->txbuf) cdns_spi_write(xspi, CDNS_SPI_TXD, *xspi->txbuf++); else -- 1.7.9.5