Hi Chris,
On 01/07/2014 10:37 AM, Franky Lin wrote:
For high clock frequency modes, ie. SDR104 and possibly SDR50, the data
window on the CMD and DAT lines needs to be tuned. Once tuned to a
sample clock rate, a re-tuning might required because of drifted signal
on different lines. This re-tuning is needed and only necessary for
commands using the DAT lines, ie. adtc type commands. This patch is an
optimization by adding the condition of the requested command being adtc
type in order to execute the re-tuning procedure.
Signed-off-by: Franky Lin <frankyl@xxxxxxxxxxxx>
---
Is this still in your queue? Any remarks on it?
Thanks,
Franky
drivers/mmc/host/sdhci.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/mmc/host/sdhci.c b/drivers/mmc/host/sdhci.c
index cc00bed..f301cd6 100644
--- a/drivers/mmc/host/sdhci.c
+++ b/drivers/mmc/host/sdhci.c
@@ -1389,7 +1389,8 @@ static void sdhci_request(struct mmc_host *mmc, struct mmc_request *mrq)
* tuning procedure before sending command.
*/
if ((host->flags & SDHCI_NEEDS_RETUNING) &&
- !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ))) {
+ !(present_state & (SDHCI_DOING_WRITE | SDHCI_DOING_READ)) &&
+ mmc_cmd_type(mrq->cmd) == MMC_CMD_ADTC) {
if (mmc->card) {
/* eMMC uses cmd21 but sd and sdio use cmd19 */
tuning_opcode =
--
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