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[v8,14/16] mmc: sdhci-msm: Save the calculated tuning phase

Message ID 1479312052-22396-15-git-send-email-riteshh@codeaurora.org (mailing list archive)
State Superseded, archived
Delegated to: Stephen Boyd
Headers show

Commit Message

Ritesh Harjani Nov. 16, 2016, 4 p.m. UTC 
Save the tuning phase once the tuning is performed.
This phase value will be used while calibrating DLL
for HS400 mode.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/mmc/host/sdhci-msm.c | 10 ++++++++++
 1 file changed, 10 insertions(+)
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Patch

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index ab59171..1556d45 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -75,6 +75,7 @@ 
 
 #define CORE_VENDOR_SPEC_CAPABILITIES0	0x11c
 
+#define INVALID_TUNING_PHASE	-1
 #define SDHCI_MSM_MIN_CLOCK	400000
 #define CORE_FREQ_100MHZ	(100 * 1000 * 1000)
 
@@ -97,6 +98,7 @@  struct sdhci_msm_host {
 	bool use_14lpp_dll_reset;
 	bool tuning_done;
 	bool calibration_done;
+	u8 saved_tuning_phase;
 };
 
 /* Platform specific tuning */
@@ -136,6 +138,9 @@  static int msm_config_cm_dll_phase(struct sdhci_host *host, u8 phase)
 	u32 config;
 	struct mmc_host *mmc = host->mmc;
 
+	if (phase > 0xf)
+		return -EINVAL;
+
 	spin_lock_irqsave(&host->lock, flags);
 
 	config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
@@ -429,6 +434,8 @@  static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
 	int rc;
 	struct mmc_host *mmc = host->mmc;
 	struct mmc_ios ios = host->mmc->ios;
+	struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
+	struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
 
 	/*
 	 * Tuning is required for SDR104, HS200 and HS400 cards and
@@ -453,6 +460,7 @@  static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)
 		if (rc)
 			return rc;
 
+		msm_host->saved_tuning_phase = phase;
 		rc = mmc_send_tuning(mmc, opcode, NULL);
 		if (!rc) {
 			/* Tuning is successful at this tuning point */
@@ -799,6 +807,8 @@  static int sdhci_msm_probe(struct platform_device *pdev)
 
 	sdhci_get_of_property(pdev);
 
+	msm_host->saved_tuning_phase = INVALID_TUNING_PHASE;
+
 	/* Setup SDCC bus voter clock. */
 	msm_host->bus_clk = devm_clk_get(&pdev->dev, "bus");
 	if (!IS_ERR(msm_host->bus_clk)) {