diff options
author | Dong Aisheng <b29396@freescale.com> | 2013-09-13 19:11:34 +0800 |
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committer | Chris Ball <cjb@laptop.org> | 2013-09-26 07:57:23 -0400 |
commit | 0322191e62984b94d1b2ae5ff322112e1fa1ef1a (patch) | |
tree | e58c406d1dcbf45d77a6cc7fb1acbda8179001a7 /drivers/macintosh | |
parent | fed2f6e2d42e4bcdec5ea357e7a9db8602744753 (diff) |
mmc: sdhci-esdhc-imx: add sd3.0 SDR clock tuning support
Freescale i.MX6Q/DL uSDHC clock tuning progress is a little different from
the standard tuning process defined in host controller spec v3.0.
Thus we use platform_execute_tuning instead of standard sdhci tuning.
The main difference are:
1) not only generate Buffer Read Ready interrupt when tuning is performing.
It generates all other DATA interrupts like the normal data command.
2) SDHCI_CTRL_EXEC_TUNING is not automatically cleared by HW,
instead it's controlled by SW.
3) SDHCI_CTRL_TUNED_CLK is not automatically set by HW,
it's controlled by SW.
4) the clock delay for every tuning is set by SW.
Signed-off-by: Dong Aisheng <b29396@freescale.com>
Acked-by: Shawn Guo <shawn.guo@linaro.org>
Signed-off-by: Chris Ball <cjb@laptop.org>
Diffstat (limited to 'drivers/macintosh')
0 files changed, 0 insertions, 0 deletions