Commit 4b6f37d3 authored by Russell King's avatar Russell King Committed by Chris Ball

mmc: sdhci: clean up sdhci_execute_tuning() decision

Clean up the code in sdhci_execute_tuning() so the decision whether
to execute tuning is clearer - and despite this reflecting what the
original code was doing, it shows that it may not be what the author
actually intended.
Signed-off-by: default avatarRussell King <rmk+kernel@arm.linux.org.uk>
Tested-by: default avatarMarkus Pargmann <mpa@pengutronix.de>
Tested-by: default avatarStephen Warren <swarren@nvidia.com>
Signed-off-by: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarChris Ball <chris@printf.net>
parent d975f121
......@@ -1820,21 +1820,16 @@ static int sdhci_card_busy(struct mmc_host *mmc)
static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
{
struct sdhci_host *host;
struct sdhci_host *host = mmc_priv(mmc);
u16 ctrl;
int tuning_loop_counter = MAX_TUNING_LOOP;
unsigned long timeout;
int err = 0;
bool requires_tuning_nonuhs = false;
unsigned long flags;
host = mmc_priv(mmc);
sdhci_runtime_pm_get(host);
spin_lock_irqsave(&host->lock, flags);
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/*
* The Host Controller needs tuning only in case of SDR104 mode
* and for SDR50 mode when Use Tuning for SDR50 is set in the
......@@ -1842,16 +1837,18 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
* If the Host Controller supports the HS200 mode then the
* tuning function has to be executed.
*/
if (host->timing == MMC_TIMING_UHS_SDR50 &&
(host->flags & SDHCI_SDR50_NEEDS_TUNING ||
host->flags & SDHCI_SDR104_NEEDS_TUNING))
requires_tuning_nonuhs = true;
if (host->timing == MMC_TIMING_MMC_HS200 ||
host->timing == MMC_TIMING_UHS_SDR104 ||
requires_tuning_nonuhs)
ctrl |= SDHCI_CTRL_EXEC_TUNING;
else {
switch (host->timing) {
case MMC_TIMING_MMC_HS200:
case MMC_TIMING_UHS_SDR104:
break;
case MMC_TIMING_UHS_SDR50:
if (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
host->flags & SDHCI_SDR104_NEEDS_TUNING)
break;
/* FALLTHROUGH */
default:
spin_unlock_irqrestore(&host->lock, flags);
sdhci_runtime_pm_put(host);
return 0;
......@@ -1864,6 +1861,8 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
return err;
}
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
ctrl |= SDHCI_CTRL_EXEC_TUNING;
sdhci_writew(host, ctrl, SDHCI_HOST_CONTROL2);
/*
......
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