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mmc: sdhci-omap: Add platform specific reset callback 

The TRM (SPRUIC2C - January 2017 - Revised May 2018 [1]) forbids
assertion of data reset while tuning is happening. Implement a
platform specific callback that takes care of this condition.

[1] http://www.ti.com/lit/pdf/spruic2 Section 25.5.1.2.4

Acked-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Faiz Abbas <faiz_abbas@ti.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Faiz Abbas 2018-11-21 16:03:56 +05:30 committed by Ulf Hansson
parent 96e03fffa3
commit 5b0d62108b
1 changed files with 19 additions and 1 deletions
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20
drivers/mmc/host/sdhci-omap.c
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@ -115,6 +115,7 @@ struct sdhci_omap_host {
struct pinctrl *pinctrl; struct pinctrl *pinctrl;
struct pinctrl_state **pinctrl_state; struct pinctrl_state **pinctrl_state;
bool is_tuning;
}; };
static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host); static void sdhci_omap_start_clock(struct sdhci_omap_host *omap_host);
@ -322,6 +323,8 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
dcrc_was_enabled = true; dcrc_was_enabled = true;
} }
omap_host->is_tuning = true;
while (phase_delay <= MAX_PHASE_DELAY) { while (phase_delay <= MAX_PHASE_DELAY) {
sdhci_omap_set_dll(omap_host, phase_delay); sdhci_omap_set_dll(omap_host, phase_delay);
@ -359,9 +362,12 @@ static int sdhci_omap_execute_tuning(struct mmc_host *mmc, u32 opcode)
phase_delay = max_window + 4 * (max_len >> 1); phase_delay = max_window + 4 * (max_len >> 1);
sdhci_omap_set_dll(omap_host, phase_delay); sdhci_omap_set_dll(omap_host, phase_delay);
omap_host->is_tuning = false;
goto ret; goto ret;
tuning_error: tuning_error:
omap_host->is_tuning = false;
dev_err(dev, "Tuning failed\n"); dev_err(dev, "Tuning failed\n");
sdhci_omap_disable_tuning(omap_host); sdhci_omap_disable_tuning(omap_host);
@ -687,6 +693,18 @@ static void sdhci_omap_set_uhs_signaling(struct sdhci_host *host,
sdhci_omap_start_clock(omap_host); sdhci_omap_start_clock(omap_host);
} }
void sdhci_omap_reset(struct sdhci_host *host, u8 mask)
{
struct sdhci_pltfm_host *pltfm_host = sdhci_priv(host);
struct sdhci_omap_host *omap_host = sdhci_pltfm_priv(pltfm_host);
/* Don't reset data lines during tuning operation */
if (omap_host->is_tuning)
mask &= ~SDHCI_RESET_DATA;
sdhci_reset(host, mask);
}
static struct sdhci_ops sdhci_omap_ops = { static struct sdhci_ops sdhci_omap_ops = {
.set_clock = sdhci_omap_set_clock, .set_clock = sdhci_omap_set_clock,
.set_power = sdhci_omap_set_power, .set_power = sdhci_omap_set_power,
@ -695,7 +713,7 @@ static struct sdhci_ops sdhci_omap_ops = {
.get_min_clock = sdhci_omap_get_min_clock, .get_min_clock = sdhci_omap_get_min_clock,
.set_bus_width = sdhci_omap_set_bus_width, .set_bus_width = sdhci_omap_set_bus_width,
.platform_send_init_74_clocks = sdhci_omap_init_74_clocks, .platform_send_init_74_clocks = sdhci_omap_init_74_clocks,
.reset = sdhci_reset, .reset = sdhci_omap_reset,
.set_uhs_signaling = sdhci_omap_set_uhs_signaling, .set_uhs_signaling = sdhci_omap_set_uhs_signaling,
}; };