diff options
| author | Russell King <rmk+kernel@arm.linux.org.uk> | 2014-04-25 12:59:36 +0100 |
|---|---|---|
| committer | Chris Ball <chris@printf.net> | 2014-05-22 08:33:26 -0400 |
| commit | 4b6f37d3a379b09840c482bc4dcb9c3b4f7246c1 (patch) | |
| tree | c2448d58c5ce423fc338f5dc948f2b0d952907c7 /drivers/mmc | |
| parent | d975f121011a58223c7936ab483c3374a83236c3 (diff) | |
| download | linux-4b6f37d3a379b09840c482bc4dcb9c3b4f7246c1.tar.bz2 | |
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: 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>
Diffstat (limited to 'drivers/mmc')
| -rw-r--r-- | drivers/mmc/host/sdhci.c | 31 |
1 files changed, 15 insertions, 16 deletions
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c index 956799c75df2..5c8b192c4c3e 100644 --- a/drivers/mmc/host/sdhci.c +++ b/drivers/mmc/host/sdhci.c @@ -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); /* |