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| author | Markus Niebel <Markus.Niebel@tqs.de> | 2014-01-14 09:23:34 +0100 |
|---|---|---|
| committer | Sascha Hauer <s.hauer@pengutronix.de> | 2014-01-15 15:22:43 +0100 |
| commit | 78b9e4e041461047ffb27f4a12c8c7346ca34149 (patch) | |
| tree | 09449787815f42d3394b70efa095e47a83fcf878 /drivers/mci/imx-esdhc.c | |
| parent | 96da2169915df634e113e444c357d0cde7c054b8 (diff) | |
| download | barebox-78b9e4e041461047ffb27f4a12c8c7346ca34149.tar.gz barebox-78b9e4e041461047ffb27f4a12c8c7346ca34149.tar.xz | |
mci: add DSR support
The eMMC and the SD-Card specifications describe the optional SET_DSR command.
During measurements at our lab we found that some cards implementing this feature
having really strong driver strengts per default. This can lead to voltage peaks
above the specification of the host on signal edges for data sent from a card to
the host.
Since availability of a given card type may be shorter than the time a certain
hardware will be produced it is useful to have support for this command (Alternative
would be changing termination resistors and adapting the driver strength of the
host to the used card.)
Signed-off-by: Markus Niebel <Markus.Niebel@tqs.de>
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
Diffstat (limited to 'drivers/mci/imx-esdhc.c')
0 files changed, 0 insertions, 0 deletions