Hi,
On Thu, Jan 05 2012, Girish K S wrote:
> @@ -1703,10 +1707,13 @@ static int sdhci_execute_tuning(struct mmc_host *mmc)
> * Host Controller needs tuning only in case of SDR104 mode
> * and for SDR50 mode when Use Tuning for SDR50 is set in
> * Capabilities register.
> + * If the Host Controller supports the HS200 mode then tuning
> + * function has to be executed.
> */
> if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) ||
> (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) &&
> - (host->flags & SDHCI_SDR50_NEEDS_TUNING)))
> + (host->flags & SDHCI_SDR50_NEEDS_TUNING)) ||
> + (host->flags & SDHCI_HS200_NEEDS_TUNING))
> ctrl |= SDHCI_CTRL_EXEC_TUNING;
> else {
> spin_unlock(&host->lock);
Actually, this generates a warning:
/home/cjb/git/mmc/drivers/mmc/host/sdhci.c: In function ‘sdhci_execute_tuning’:
/home/cjb/git/mmc/drivers/mmc/host/sdhci.c:1716:7: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses]
.. as well as being hard to follow. Shall we split it up as below instead?
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index 64febf2..5627354 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1694,6 +1694,7 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
int tuning_loop_counter = MAX_TUNING_LOOP;
unsigned long timeout;
int err = 0;
+ bool requires_tuning_nonuhs;
host = mmc_priv(mmc);
@@ -1704,16 +1705,19 @@ static int sdhci_execute_tuning(struct mmc_host *mmc, u32 opcode)
ctrl = sdhci_readw(host, SDHCI_HOST_CONTROL2);
/*
- * Host Controller needs tuning only in case of SDR104 mode
- * and for SDR50 mode when Use Tuning for SDR50 is set in
+ * The Host Controller needs tuning only in case of SDR104 mode
+ * and for SDR50 mode when Use Tuning for SDR50 is set in the
* Capabilities register.
- * If the Host Controller supports the HS200 mode then tuning
- * function has to be executed.
+ * If the Host Controller supports the HS200 mode then the
+ * tuning function has to be executed.
*/
- if ((ctrl & SDHCI_CTRL_UHS_MASK == SDHCI_CTRL_UHS_SDR104) ||
- ((ctrl & SDHCI_CTRL_UHS_MASK == SDHCI_CTRL_UHS_SDR50) &&
- host->flags & SDHCI_SDR50_NEEDS_TUNING ||
+ if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR50) &&
+ (host->flags & SDHCI_SDR50_NEEDS_TUNING ||
host->flags & SDHCI_HS200_NEEDS_TUNING))
+ requires_tuning_nonuhs = true;
+
+ if (((ctrl & SDHCI_CTRL_UHS_MASK) == SDHCI_CTRL_UHS_SDR104) ||
+ requires_tuning_nonuhs)
ctrl |= SDHCI_CTRL_EXEC_TUNING;
else {
spin_unlock(&host->lock);
--
Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/>
One Laptop Per Child
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