Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752845AbcD2Cr0 (ORCPT ); Thu, 28 Apr 2016 22:47:26 -0400 Received: from lucky1.263xmail.com ([211.157.147.133]:37307 "EHLO lucky1.263xmail.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752762AbcD2CrY (ORCPT ); Thu, 28 Apr 2016 22:47:24 -0400 X-263anti-spam: KSV:0; X-MAIL-GRAY: 1 X-MAIL-DELIVERY: 0 X-ABS-CHECKED: 4 X-ADDR-CHECKED: 0 X-KSVirus-check: 0 X-RL-SENDER: shawn.lin@rock-chips.com X-FST-TO: adrian.hunter@intel.com X-SENDER-IP: 58.22.7.114 X-LOGIN-NAME: shawn.lin@rock-chips.com X-UNIQUE-TAG: <071489e9b887ad69f3c445e95afbfd05> X-ATTACHMENT-NUM: 0 X-DNS-TYPE: 0 From: Shawn Lin To: Adrian Hunter , Ulf Hansson Cc: Jaehoon Chung , Michal Simek , soren.brinkmann@xilinx.com, Rob Herring , linux-mmc@vger.kernel.org, linux-kernel@vger.kernel.org, Doug Anderson , Heiko Stuebner , linux-rockchip@lists.infradead.org, devicetree@vger.kernel.org, Shawn Lin Subject: [PATCH v2 2/6] mmc: core: add mmc-hs400-enhanced-strobe support Date: Fri, 29 Apr 2016 10:46:35 +0800 Message-Id: <1461897995-28903-1-git-send-email-shawn.lin@rock-chips.com> X-Mailer: git-send-email 1.8.0 In-Reply-To: <1461897751-28810-1-git-send-email-shawn.lin@rock-chips.com> References: <1461897751-28810-1-git-send-email-shawn.lin@rock-chips.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1979 Lines: 55 This patch introduce mmc-hs400-enhanced-strobe for platforms which want to enable enhanced strobe function from DT if the mmc host controller claims to support enhanced strobe. Signed-off-by: Shawn Lin --- Changes in v2: - switch to HS400ES from Highspeed mode directly drivers/mmc/core/host.c | 2 ++ include/linux/mmc/host.h | 6 ++++++ 2 files changed, 8 insertions(+) diff --git a/drivers/mmc/core/host.c b/drivers/mmc/core/host.c index e0a3ee1..eb1530a 100644 --- a/drivers/mmc/core/host.c +++ b/drivers/mmc/core/host.c @@ -289,6 +289,8 @@ int mmc_of_parse(struct mmc_host *host) host->caps2 |= MMC_CAP2_HS400_1_8V | MMC_CAP2_HS200_1_8V_SDR; if (of_property_read_bool(np, "mmc-hs400-1_2v")) host->caps2 |= MMC_CAP2_HS400_1_2V | MMC_CAP2_HS200_1_2V_SDR; + if (of_property_read_bool(np, "mmc-hs400-enhanced-strobe")) + host->caps2 |= MMC_CAP2_HS400_ENHANCED_STROBE; host->dsr_req = !of_property_read_u32(np, "dsr", &host->dsr); if (host->dsr_req && (host->dsr & ~0xffff)) { diff --git a/include/linux/mmc/host.h b/include/linux/mmc/host.h index 85800b4..11e89d3 100644 --- a/include/linux/mmc/host.h +++ b/include/linux/mmc/host.h @@ -302,6 +302,7 @@ struct mmc_host { #define MMC_CAP2_SDIO_IRQ_NOTHREAD (1 << 17) #define MMC_CAP2_NO_WRITE_PROTECT (1 << 18) /* No physical write protect pin, assume that card is always read-write */ #define MMC_CAP2_NO_SDIO (1 << 19) /* Do not send SDIO commands during initialization */ +#define MMC_CAP2_HS400_ENHANCED_STROBE (1 << 20) /* Host supports enhanced strobe */ mmc_pm_flag_t pm_caps; /* supported pm features */ @@ -480,6 +481,11 @@ static inline int mmc_host_uhs(struct mmc_host *host) MMC_CAP_UHS_DDR50); } +static inline int mmc_host_hs400_enhanced_strobe(struct mmc_host *host) +{ + return host->caps2 & MMC_CAP2_HS400_ENHANCED_STROBE; +} + static inline int mmc_host_packed_wr(struct mmc_host *host) { return host->caps2 & MMC_CAP2_PACKED_WR; -- 2.3.7