diff options
| author | Faiz Abbas <faiz_abbas@ti.com> | 2018-11-21 13:33:56 +0300 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2018-12-17 10:26:24 +0300 |
| commit | 5b0d62108b468b13410533c0ceea3821942bf592 (patch) | |
| tree | f59db2900c252befb435f8631c1555f0e17a4ad5 /drivers/mmc/host/sdhci-omap.c | |
| parent | 96e03fffa306f3a02e34c1dbc271ea040b8705d0 (diff) | |
| download | linux-5b0d62108b468b13410533c0ceea3821942bf592.tar.xz | |
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>
Diffstat (limited to 'drivers/mmc/host/sdhci-omap.c')
| -rw-r--r-- | drivers/mmc/host/sdhci-omap.c | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/drivers/mmc/host/sdhci-omap.c b/drivers/mmc/host/sdhci-omap.c index d264391616f9..4fad47926743 100644 --- a/drivers/mmc/host/sdhci-omap.c +++ b/drivers/mmc/host/sdhci-omap.c @@ -115,6 +115,7 @@ struct sdhci_omap_host { struct pinctrl *pinctrl; struct pinctrl_state **pinctrl_state; + bool is_tuning; }; 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; } + omap_host->is_tuning = true; + while (phase_delay <= MAX_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); sdhci_omap_set_dll(omap_host, phase_delay); + omap_host->is_tuning = false; + goto ret; tuning_error: + omap_host->is_tuning = false; dev_err(dev, "Tuning failed\n"); 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); } +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 = { .set_clock = sdhci_omap_set_clock, .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, .set_bus_width = sdhci_omap_set_bus_width, .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, }; |