From mboxrd@z Thu Jan 1 00:00:00 1970 From: Ritesh Harjani Subject: [PATCH v7 09/14] mmc: sdhci-msm: Add clock changes for DDR mode. Date: Mon, 14 Nov 2016 11:30:43 +0530 Message-ID: <1479103248-9491-10-git-send-email-riteshh@codeaurora.org> References: <1479103248-9491-1-git-send-email-riteshh@codeaurora.org> Return-path: In-Reply-To: <1479103248-9491-1-git-send-email-riteshh-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org> Sender: devicetree-owner-u79uwXL29TY76Z2rM5mHXA@public.gmane.org To: ulf.hansson-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, linux-mmc-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, adrian.hunter-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, shawn.lin-TNX95d0MmH7DzftRWevZcw@public.gmane.org, sboyd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, andy.gross-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org Cc: devicetree-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, linux-clk-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, david.brown-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, linux-arm-msm-u79uwXL29TY76Z2rM5mHXA@public.gmane.org, georgi.djakov-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, alex.lemberg-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org, mateusz.nowak-ral2JQCrhuEAvxtiuMwx3w@public.gmane.org, Yuliy.Izrailov-XdAiOPVOjttBDgjK7y7TUQ@public.gmane.org, asutoshd-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, kdorfman-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, david.griego-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, stummala-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, venkatg-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, rnayak-sgV2jX0FEOL9JmXXK+q4OQ@public.gmane.org, pramod.gurav-QSEj5FYQhm4dnm+yROfE0A@public.gmane.org, Ritesh Harjani List-Id: linux-arm-msm@vger.kernel.org SDHC MSM controller need 2x clock for MCLK at GCC. Hence make required changes to have 2x clock for DDR timing modes. Signed-off-by: Ritesh Harjani Acked-by: Adrian Hunter --- drivers/mmc/host/sdhci-msm.c | 17 +++++++++++++++-- 1 file changed, 15 insertions(+), 2 deletions(-) diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c index b96a4a7..41a4ea7 100644 --- a/drivers/mmc/host/sdhci-msm.c +++ b/drivers/mmc/host/sdhci-msm.c @@ -637,6 +637,7 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock) { struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host); struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host); + struct mmc_ios curr_ios = host->mmc->ios; int rc; if (!clock) { @@ -645,11 +646,23 @@ static void sdhci_msm_set_clock(struct sdhci_host *host, unsigned int clock) } spin_unlock_irq(&host->lock); + /* + * The SDHC requires internal clock frequency to be double the + * actual clock that will be set for DDR mode. The controller + * uses the faster clock(100/400MHz) for some of its parts and + * send the actual required clock (50/200MHz) to the card. + */ + if ((curr_ios.timing == MMC_TIMING_UHS_DDR50) || + (curr_ios.timing == MMC_TIMING_MMC_DDR52) || + (curr_ios.timing == MMC_TIMING_MMC_HS400)) + clock *= 2; + if (clock != msm_host->clk_rate) { rc = clk_set_rate(msm_host->clk, clock); if (rc) { - pr_err("%s: Failed to set clock at rate %u\n", - mmc_hostname(host->mmc), clock); + pr_err("%s: Failed to set clock at rate %u at timing %d\n", + mmc_hostname(host->mmc), clock, + curr_ios.timing); spin_lock_irq(&host->lock); goto out; } -- The Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, a Linux Foundation Collaborative Project. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo-u79uwXL29TY76Z2rM5mHXA@public.gmane.org More majordomo info at http://vger.kernel.org/majordomo-info.html