Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752488AbaDQSAd (ORCPT ); Thu, 17 Apr 2014 14:00:33 -0400 Received: from mail-pd0-f202.google.com ([209.85.192.202]:61981 "EHLO mail-pd0-f202.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751342AbaDQSAT (ORCPT ); Thu, 17 Apr 2014 14:00:19 -0400 X-Greylist: delayed 84884 seconds by postgrey-1.27 at vger.kernel.org; Thu, 17 Apr 2014 14:00:19 EDT From: Doug Anderson To: Lee Jones , Stephen Warren , Wolfram Sang Cc: abrestic@chromium.org, dgreid@chromium.org, Olof Johansson , Simon Glass , linux-samsung-soc@vger.kernel.org, linux-tegra@vger.kernel.org, Doug Anderson , Samuel Ortiz , linux-kernel@vger.kernel.org Subject: [PATCH 4/7] mfd: cros_ec: spi: Increase cros_ec_spi deadline from 5ms to 100ms Date: Thu, 17 Apr 2014 10:59:27 -0700 Message-Id: <1397757570-19750-5-git-send-email-dianders@chromium.org> X-Mailer: git-send-email 1.9.1.423.g4596e3a In-Reply-To: <1397757570-19750-1-git-send-email-dianders@chromium.org> References: <1397757570-19750-1-git-send-email-dianders@chromium.org> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org We're adding i2c tunneling to the list of things that goes over cros_ec. i2c tunneling can be slooooooow, so increase our deadline to 100ms to account for that. Signed-off-by: Doug Anderson --- drivers/mfd/cros_ec_spi.c | 24 ++++++++++++++++-------- 1 file changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/mfd/cros_ec_spi.c b/drivers/mfd/cros_ec_spi.c index 4f863c3..0b8d328 100644 --- a/drivers/mfd/cros_ec_spi.c +++ b/drivers/mfd/cros_ec_spi.c @@ -39,14 +39,22 @@ #define EC_MSG_PREAMBLE_COUNT 32 /* - * We must get a response from the EC in 5ms. This is a very long - * time, but the flash write command can take 2-3ms. The EC command - * processing is currently not very fast (about 500us). We could - * look at speeding this up and making the flash write command a - * 'slow' command, requiring a GET_STATUS wait loop, like flash - * erase. - */ -#define EC_MSG_DEADLINE_MS 5 + * Allow for a long time for the EC to respond. We support i2c + * tunneling and support fairly long messages for the tunnel (249 + * bytes long at the moment). If we're talking to a 100 kHz device + * on the other end and need to transfer ~256 bytes, then we need: + * 10 us/bit * ~10 bits/byte * ~256 bytes = ~25ms + * + * We'll wait 4 times that to handle clock stretching and other + * paranoia. + * + * It's pretty unlikely that we'll really see a 249 byte tunnel in + * anything other than testing. If this was more common we might + * consider having slow commands like this require a GET_STATUS + * wait loop. The 'flash write' command would be another candidate + * for this, clocking in at 2-3ms. + */ +#define EC_MSG_DEADLINE_MS 100 /* * Time between raising the SPI chip select (for the end of a -- 1.9.1.423.g4596e3a -- 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/