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mmc: sdhci: track whether preset mode is currently enabled in hardware 

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@arm.linux.org.uk>
Tested-by: Markus Pargmann <mpa@pengutronix.de>
Tested-by: Stephen Warren <swarren@nvidia.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Chris Ball <chris@printf.net>
wifi-calibration
Russell King 2014-04-25 13:00:12 +01:00 committed by Chris Ball
parent 24fbb3ca14
commit da91a8f9c0
2 changed files with 27 additions and 18 deletions
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44
drivers/mmc/host/sdhci.c
View File

@ -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);
@ -1493,13 +1497,13 @@ 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;
@ -2018,26 +2022,30 @@ out:
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;
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;
} else 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;
if (enable)
host->flags |= SDHCI_PV_ENABLED;
else
host->flags &= ~SDHCI_PV_ENABLED;
host->preset_enabled = enable;
}
}

1
include/linux/mmc/sdhci.h
View File

@ -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 */