From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail177-1.suw61.mandrillapp.com ([198.2.177.1]:23675 "EHLO mail177-1.suw61.mandrillapp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753701AbcCATKU (ORCPT ); Tue, 1 Mar 2016 14:10:20 -0500 Received: from pmta06.mandrill.prod.suw01.rsglab.com (127.0.0.1) by mail177-1.suw61.mandrillapp.com id hqnkho22rtkj for ; Tue, 1 Mar 2016 19:10:19 +0000 (envelope-from ) From: Subject: Patch "mmc: mmc: Fix incorrect use of driver strength switching HS200 and HS400" has been added to the 4.4-stable tree To: , , , Cc: , Message-Id: <1456859415281@kroah.com> Date: Tue, 01 Mar 2016 19:10:19 +0000 MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled mmc: mmc: Fix incorrect use of driver strength switching HS200 and HS400 to the 4.4-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: mmc-mmc-fix-incorrect-use-of-driver-strength-switching-hs200-and-hs400.patch and it can be found in the queue-4.4 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From adb24d42a516bca8b9741ed21206509daaab5b13 Mon Sep 17 00:00:00 2001 From: Wenkai Du Date: Thu, 26 Nov 2015 14:00:44 +0200 Subject: mmc: mmc: Fix incorrect use of driver strength switching HS200 and HS400 From: Wenkai Du commit adb24d42a516bca8b9741ed21206509daaab5b13 upstream. Commit cc4f414c885c ("mmc: mmc: Add driver strength selection") added driver strength selection for eMMC HS200 and HS400 modes. That patch also set the driver stength when transitioning through High Speed mode to HS200/HS400, but driver strength is not defined for High Speed mode. While the JEDEC specification is not clear on this point it has been observed to cause problems for some eMMC, and removing the driver strength setting in this case makes it consistent with the normal use of High Speed mode. Signed-off-by: Wenkai Du Signed-off-by: Adrian Hunter Signed-off-by: Ulf Hansson Signed-off-by: Greg Kroah-Hartman --- drivers/mmc/core/mmc.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -1076,8 +1076,7 @@ static int mmc_select_hs400(struct mmc_c mmc_set_clock(host, max_dtr); /* Switch card to HS mode */ - val = EXT_CSD_TIMING_HS | - card->drive_strength << EXT_CSD_DRV_STR_SHIFT; + val = EXT_CSD_TIMING_HS; err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, val, card->ext_csd.generic_cmd6_time, @@ -1160,8 +1159,7 @@ int mmc_hs400_to_hs200(struct mmc_card * mmc_set_clock(host, max_dtr); /* Switch HS400 to HS DDR */ - val = EXT_CSD_TIMING_HS | - card->drive_strength << EXT_CSD_DRV_STR_SHIFT; + val = EXT_CSD_TIMING_HS; err = __mmc_switch(card, EXT_CSD_CMD_SET_NORMAL, EXT_CSD_HS_TIMING, val, card->ext_csd.generic_cmd6_time, true, send_status, true); Patches currently in stable-queue which might be from wenkai.du@intel.com are queue-4.4/mmc-mmc-fix-incorrect-use-of-driver-strength-switching-hs200-and-hs400.patch