Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751736Ab0LKUC5 (ORCPT ); Sat, 11 Dec 2010 15:02:57 -0500 Received: from mail-ey0-f171.google.com ([209.85.215.171]:43406 "EHLO mail-ey0-f171.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751557Ab0LKUCy (ORCPT ); Sat, 11 Dec 2010 15:02:54 -0500 DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=from:to:cc:subject:date:message-id:x-mailer; b=oVASk8FN4PP+3lW8BUZbQ7kurOP6sS4bUpIrCn0Q+u4BOEpvo9OPHS+DNLqJZgbMG8 QVF2uDXivfSjBBQncyWgSJ4FvvZY3D+4ZVR4pCVYL9Hv6VNGjHPToMzQuE2WmNWkNbZn /pIxnLl+ncGvG6xQdov34FTDhkY6xYzu9p+F0= From: Igor Plyatov To: sshtylyov@mvista.com Cc: jgarzik@pobox.com, linux-ide@vger.kernel.org, linux-kernel@vger.kernel.org, geomatsi@gmail.com, nicolas.ferre@atmel.com, linux@maxim.org.za, linux-arm-kernel@lists.infradead.org, linux@arm.linux.org.uk, christian.glindkamp@taskit.de, ryan@bluewatersys.com, pgsellmann@portner-elektronik.at, Igor Plyatov Subject: [PATCH] ide: at91_ide.c bugfix for high master clock Date: Sat, 11 Dec 2010 23:02:25 +0300 Message-Id: <1292097745-9680-1-git-send-email-plyatov@gmail.com> X-Mailer: git-send-email 1.7.0.4 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3162 Lines: 86 The AT91SAM9 microcontrollers with master clock higher then 105 MHz and PIO0, have overflow of the NCS_RD_PULSE value in the MSB. This lead to "NCS_RD_PULSE" pulse longer then "NRD_CYCLE" pulse and at91_ide driver does not detect ATA device. This patch must be applied on top of my patch for pata_at91 where the same bug fixed. Signed-off-by: Igor Plyatov --- drivers/ata/pata_at91.c | 2 +- drivers/ide/at91_ide.c | 31 +++++++++++++++++++++---------- 2 files changed, 22 insertions(+), 11 deletions(-) diff --git a/drivers/ata/pata_at91.c b/drivers/ata/pata_at91.c index 2e189be..a462405 100644 --- a/drivers/ata/pata_at91.c +++ b/drivers/ata/pata_at91.c @@ -113,7 +113,7 @@ static void set_smc_timing(struct device *dev, ncs_read_pulse = read_cycle - 2; if (ncs_read_pulse > NCS_RD_PULSE_LIMIT) { ncs_read_pulse = NCS_RD_PULSE_LIMIT; - dev_dbg(dev, "ncs_read_pulse limited to maximal value %lu\n", + dev_warn(dev, "ncs_read_pulse limited to maximal value %lu\n", ncs_read_pulse); } diff --git a/drivers/ide/at91_ide.c b/drivers/ide/at91_ide.c index 000a78e..d9192e6 100644 --- a/drivers/ide/at91_ide.c +++ b/drivers/ide/at91_ide.c @@ -70,6 +70,7 @@ static void set_smc_timings(const u8 chipselect, const u16 cycle, const u16 setup, const u16 pulse, const u16 data_float, int use_iordy) { + u16 ncs_rd_pulse; unsigned long mode = AT91_SMC_READMODE | AT91_SMC_WRITEMODE | AT91_SMC_BAT_SELECT; @@ -81,19 +82,29 @@ static void set_smc_timings(const u8 chipselect, const u16 cycle, if (data_float) mode |= AT91_SMC_TDF_(data_float); + ncs_rd_pulse = cycle; + if (ncs_rd_pulse > 63) { + ncs_rd_pulse = 63; + pr_warn(DRV_NAME ": ncs_rd_pulse limited to maximal value %d\n", + ncs_rd_pulse); + } + at91_sys_write(AT91_SMC_MODE(chipselect), mode); /* setup timings in SMC */ - at91_sys_write(AT91_SMC_SETUP(chipselect), AT91_SMC_NWESETUP_(setup) | - AT91_SMC_NCS_WRSETUP_(0) | - AT91_SMC_NRDSETUP_(setup) | - AT91_SMC_NCS_RDSETUP_(0)); - at91_sys_write(AT91_SMC_PULSE(chipselect), AT91_SMC_NWEPULSE_(pulse) | - AT91_SMC_NCS_WRPULSE_(cycle) | - AT91_SMC_NRDPULSE_(pulse) | - AT91_SMC_NCS_RDPULSE_(cycle)); - at91_sys_write(AT91_SMC_CYCLE(chipselect), AT91_SMC_NWECYCLE_(cycle) | - AT91_SMC_NRDCYCLE_(cycle)); + at91_sys_write(AT91_SMC_SETUP(chipselect), + AT91_SMC_NWESETUP_(setup) | + AT91_SMC_NCS_WRSETUP_(0) | + AT91_SMC_NRDSETUP_(setup) | + AT91_SMC_NCS_RDSETUP_(0)); + at91_sys_write(AT91_SMC_PULSE(chipselect), + AT91_SMC_NWEPULSE_(pulse) | + AT91_SMC_NCS_WRPULSE_(ncs_rd_pulse) | + AT91_SMC_NRDPULSE_(pulse) | + AT91_SMC_NCS_RDPULSE_(ncs_rd_pulse)); + at91_sys_write(AT91_SMC_CYCLE(chipselect), + AT91_SMC_NWECYCLE_(cycle) | + AT91_SMC_NRDCYCLE_(cycle)); } static unsigned int calc_mck_cycles(unsigned int ns, unsigned int mck_hz) -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/