Track whether preset mode is currently enabled in hardware, and use that
when making decisions elsewhere in the code rather than reading the
register and checking the bit.
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci.c | 44 ++++++++++++++++++++++++++------------------
include/linux/mmc/sdhci.h | 1 +
2 files changed, 27 insertions(+), 18 deletions(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index aad70ffa484e..a7dd667aaf95 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -205,9 +205,14 @@ static void sdhci_do_reset(struct sdhci_host *host, u8 mask)
host->ops->reset(host, mask);
- if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
- if ((host->ops->enable_dma) && (mask & SDHCI_RESET_ALL))
- host->ops->enable_dma(host);
+ if (mask & SDHCI_RESET_ALL) {
+ if (host->flags & (SDHCI_USE_SDMA | SDHCI_USE_ADMA)) {
+ if (host->ops->enable_dma)
+ host->ops->enable_dma(host);
+ }
+
+ /* Resetting the controller clears many */
+ host->preset_enabled = false;
}
}
@@ -1126,8 +1131,7 @@ void sdhci_set_clock(struct sdhci_host *host, unsigned int clock)
return;
if (host->version >= SDHCI_SPEC_300) {
- if (sdhci_readw(host, SDHCI_HOST_CONTROL2) &
- SDHCI_CTRL_PRESET_VAL_ENABLE) {
+ if (host->preset_enabled) {
u16 pre_val;
clk = sdhci_readw(host, SDHCI_CLOCK_CONTROL);
@@ -1491,13 +1495,13 @@ static void sdhci_do_set_ios(struct sdhci_host *host, struct mmc_ios *ios)
(ios->timing == MMC_TIMING_UHS_SDR25))
ctrl |= SDHCI_CTRL_HISPD;
- ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
- if (!(ctrl_2 & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
+ if (!host->preset_enabled) {
sdhci_writeb(host, ctrl, SDHCI_HOST_CONTROL);
/*
* We only need to set Driver Strength if the
* preset value enable is not set.
*/
+ ctrl_2 = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl_2 &= ~SDHCI_CTRL_DRV_TYPE_MASK;
if (ios->drv_type == MMC_SET_DRIVER_TYPE_A)
ctrl_2 |= SDHCI_CTRL_DRV_TYPE_A;
@@ -2012,26 +2016,30 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
static void sdhci_enable_preset_value(struct sdhci_host *host, bool enable)
{
- u16 ctrl;
-
/* Host Controller v3.00 defines preset value registers */
if (host->version < SDHCI_SPEC_300)
return;
- ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
-
/*
* We only enable or disable Preset Value if they are not already
* enabled or disabled respectively. Otherwise, we bail out.
*/
- if (enable && !(ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
- ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
- sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
- host->flags |= SDHCI_PV_ENABLED;
- } else if (!enable && (ctrl & SDHCI_CTRL_PRESET_VAL_ENABLE)) {
- ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
+ if (host->preset_enabled != enable) {
+ u16 ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
+
+ if (enable)
+ ctrl |= SDHCI_CTRL_PRESET_VAL_ENABLE;
+ else
+ ctrl &= ~SDHCI_CTRL_PRESET_VAL_ENABLE;
+
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
- host->flags &= ~SDHCI_PV_ENABLED;
+
+ if (enable)
+ host->flags |= SDHCI_PV_ENABLED;
+ else
+ host->flags &= ~SDHCI_PV_ENABLED;
+
+ host->preset_enabled = enable;
}
}
diff --git a/include/linux/mmc/sdhci.h b/include/linux/mmc/sdhci.h
index 7f3efbab8732..08abe9941884 100644
--- a/include/linux/mmc/sdhci.h
+++ b/include/linux/mmc/sdhci.h
@@ -143,6 +143,7 @@ struct sdhci_host {
bool runtime_suspended; /* Host is runtime suspended */
bool bus_on; /* Bus power prevents runtime suspend */
+ bool preset_enabled; /* Preset is enabled */
struct mmc_request *mrq; /* Current request */
struct mmc_command *cmd; /* Current command */
--
1.8.3.1
--
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