linux-kernel - [PATCH 7/8] mmc: sdhci-msm: Make HS400 tuning follow as per recommeneded HW sequence

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Date:   Wed, 28 Dec 2016 16:36:30 +0530
From:   Ritesh Harjani <riteshh@...eaurora.org>
To:     ulf.hansson@...aro.org, adrian.hunter@...el.com
Cc:     linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org,
        shawn.lin@...k-chips.com, stummala@...eaurora.org,
        georgi.djakov@...aro.org, linux-arm-msm@...r.kernel.org,
        pramod.gurav@...aro.org, jeremymc@...hat.com,
        venkatg@...eaurora.org, asutoshd@...eaurora.org,
        subhashj@...eaurora.org, Ritesh Harjani <riteshh@...eaurora.org>
Subject: [PATCH 7/8] mmc: sdhci-msm: Make HS400 tuning follow as per recommeneded HW sequence

During tuning execution for HS400 mode, HW sequence recommends
to select MCLK_SEL/2(0x3) in VENDOR_SPEC & sdhc msm clock at GCC
to be 400MHZ (nearest supported clk). Add this change in tuning
sequence during HS400 tuning.

Signed-off-by: Ritesh Harjani <riteshh@...eaurora.org>
---
 drivers/mmc/host/sdhci-msm.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index 84d29dd..fa9bce3 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -151,7 +151,8 @@ static unsigned int msm_get_clock_rate_for_bus_mode(struct sdhci_host *host,
 	 */
 	if (ios.timing == MMC_TIMING_UHS_DDR50 ||
 	    ios.timing == MMC_TIMING_MMC_DDR52 ||
-	    ios.timing == MMC_TIMING_MMC_HS400)
+	    ios.timing == MMC_TIMING_MMC_HS400 ||
+	    host->flags & SDHCI_HS400_TUNING)
 		clock *= 2;
 	return clock;
 }
@@ -611,7 +612,8 @@ void sdhci_msm_hc_select_mode(struct sdhci_host *host)
 {
 	struct mmc_ios ios = host->mmc->ios;
 
-	if (ios.timing == MMC_TIMING_MMC_HS400)
+	if (ios.timing == MMC_TIMING_MMC_HS400 ||
+	    host->flags & SDHCI_HS400_TUNING)
 		msm_hc_select_hs400(host);
 	else
 		msm_hc_select_default(host);
@@ -831,6 +833,16 @@ static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
 	    ios.timing == MMC_TIMING_UHS_SDR104))
 		return 0;
 
+	/*
+	 * For HS400 tuning in HS200 timing requires:
+	 * - select MCLK/2 in VENDOR_SPEC
+	 * - program MCLK to 400MHz (or nearest supported) in GCC
+	 */
+	if (host->flags & SDHCI_HS400_TUNING) {
+		sdhci_msm_hc_select_mode(host);
+		msm_set_clock_rate_for_bus_mode(host, ios.clock);
+	}
+
 retry:
 	/* First of all reset the tuning block */
 	rc = msm_init_cm_dll(host);
-- 
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