[RESEND PATCHv1 8/8] mmc: sdhci-msm: Provide enhanced_strobe mode feature support

Ritesh Harjani
2017-01-10T07:00:52Z

This provides enhanced_strobe mode feature support in sdhci-msm
driver.

Signed-off-by: Ritesh Harjani <riteshh@codeaurora.org>
---
drivers/mmc/host/sdhci-msm.c | 34 +++++++++++++++++++++++++---------
1 file changed, 25 insertions(+), 9 deletions(-)

diff --git a/drivers/mmc/host/sdhci-msm.c b/drivers/mmc/host/sdhci-msm.c
index fa9bce3..f958697 100644
--- a/drivers/mmc/host/sdhci-msm.c
+++ b/drivers/mmc/host/sdhci-msm.c
@@ -103,6 +103,7 @@

#define CORE_DDR_200_CFG 0x184
#define CORE_CDC_T4_DLY_SEL BIT(0)
+#define CORE_CMDIN_RCLK_EN BIT(1)
#define CORE_START_CDC_TRAFFIC BIT(6)
#define CORE_VENDOR_SPEC3 0x1b0
#define CORE_PWRSAVE_DLL BIT(3)
@@ -547,6 +548,7 @@ static void msm_hc_select_hs400(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_ios ios = host->mmc->ios;
u32 config, dll_lock;
int rc;

@@ -560,7 +562,8 @@ static void msm_hc_select_hs400(struct sdhci_host *host)
* Select HS400 mode using the HC_SELECT_IN from VENDOR SPEC
* register
*/
- if (msm_host->tuning_done && !msm_host->calibration_done) {
+ if ((msm_host->tuning_done || ios.enhanced_strobe) &&
+ !msm_host->calibration_done) {
config = readl_relaxed(host->ioaddr + CORE_VENDOR_SPEC);
config |= CORE_HC_SELECT_IN_HS400;
config |= CORE_HC_SELECT_IN_EN;
@@ -734,6 +737,7 @@ static int sdhci_msm_cdclp533_calibration(struct sdhci_host *host)

static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
{
+ struct mmc_host *mmc = host->mmc;
u32 dll_status, config;
int ret;

@@ -748,6 +752,12 @@ static int sdhci_msm_cm_dll_sdc4_calibration(struct sdhci_host *host)
*/
writel_relaxed(DDR_CONFIG_POR_VAL, host->ioaddr + CORE_DDR_CONFIG);

+ if (mmc->ios.enhanced_strobe) {
+ config = readl_relaxed(host->ioaddr + CORE_DDR_200_CFG);
+ config |= CORE_CMDIN_RCLK_EN;
+ writel_relaxed(config, host->ioaddr + CORE_DDR_200_CFG);
+ }
+
config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG_2);
config |= CORE_DDR_CAL_EN;
writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG_2);
@@ -782,6 +792,7 @@ static int sdhci_msm_hs400_dll_calibration(struct sdhci_host *host)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_msm_host *msm_host = sdhci_pltfm_priv(pltfm_host);
+ struct mmc_host *mmc = host->mmc;
int ret;
u32 config;

@@ -795,14 +806,17 @@ static int sdhci_msm_hs400_dll_calibration(struct sdhci_host *host)
if (ret)
goto out;

- /* Set the selected phase in delay line hw block */
- ret = msm_config_cm_dll_phase(host, msm_host->saved_tuning_phase);
- if (ret)
- goto out;
+ if (!mmc->ios.enhanced_strobe) {
+ /* Set the selected phase in delay line hw block */
+ ret = msm_config_cm_dll_phase(host,
+ msm_host->saved_tuning_phase);
+ if (ret)
+ goto out;
+ config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
+ config |= CORE_CMD_DAT_TRACK_SEL;
+ writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
+ }

- config = readl_relaxed(host->ioaddr + CORE_DLL_CONFIG);
- config |= CORE_CMD_DAT_TRACK_SEL;
- writel_relaxed(config, host->ioaddr + CORE_DLL_CONFIG);
if (msm_host->use_cdclp533)
ret = sdhci_msm_cdclp533_calibration(host);
else
@@ -899,6 +913,7 @@ static int sdhci_msm_execute_tuning(struct sdhci_host *host, u32 opcode)

/*
* sdhci_msm_hs400 - Calibrate the DLL for HS400 bus speed mode operation.
+ * This needs to be done for both tuning and enhanced_strobe mode.
* DLL operation is only needed for clock > 100MHz. For clock <= 100MHz
* fixed feedback clock is used.
*/
@@ -909,7 +924,8 @@ static void sdhci_msm_hs400(struct sdhci_host *host, struct mmc_ios *ios)
int ret;

if (host->clock > CORE_FREQ_100MHZ &&
- msm_host->tuning_done && !msm_host->calibration_done) {
+ (msm_host->tuning_done || ios->enhanced_strobe) &&
+ !msm_host->calibration_done) {
ret = sdhci_msm_hs400_dll_calibration(host);
if (!ret)
msm_host->calibration_done = true;
--
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