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ata: ahci_tegra: Read calibration fuse 

The original version of the driver did not read the SATA calibration
fuse to remove the dependency to the fuse driver. The fuse driver
is now merged, so add this functionality.

The calibration fuse contains a 2-bit value used to pick a set
of calibration values for the SATA pad.

Signed-off-by: Mikko Perttunen <mperttunen@nvidia.com>
Acked-by: Thierry Reding <treding@nvidia.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Mikko Perttunen 2014-08-26 12:00:30 +03:00 committed by Tejun Heo
parent 2a13772a14
commit e327f11543
1 changed files with 10 additions and 4 deletions
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14
drivers/ata/ahci_tegra.c
View File

@ -18,14 +18,17 @@
*/
#include <linux/ahci_platform.h>
#include <linux/reset.h>
#include <linux/errno.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/regulator/consumer.h>
#include <linux/reset.h>
#include <soc/tegra/fuse.h>
#include <soc/tegra/pmc.h>
#include "ahci.h"
#define SATA_CONFIGURATION_0 0x180
@ -180,9 +183,12 @@ static int tegra_ahci_controller_init(struct ahci_host_priv *hpriv)
/* Pad calibration */
/* FIXME Always use calibration 0. Change this to read the calibration
* fuse once the fuse driver has landed. */
val = 0;
ret = tegra_fuse_readl(FUSE_SATA_CALIB, &val);
if (ret) {
dev_err(&tegra->pdev->dev,
"failed to read calibration fuse: %d\n", ret);
return ret;
}
calib = tegra124_pad_calibration[val & FUSE_SATA_CALIB_MASK];