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ufs: Enable ufs for RDL fix parts only

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Read fuse to check if chip has RDL fix or not.
Return error for non-RDL chips.

Bug 4243018

Signed-off-by: Mallikarjun Kasoju <mkasoju@nvidia.com>
Change-Id: Ibe441ca136c18e03cebbc1cd5d0cc529d45005c6
This commit is contained in:
Mallikarjun Kasoju
2024-09-12 04:56:51 +00:00
committed by Jon Hunter
parent 347e5727ac
commit c3d33b827c
1 changed files with 24 additions and 0 deletions
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24
drivers/scsi/ufs/ufs-tegra-common.c
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@@ -15,6 +15,7 @@
#include <linux/gpio/consumer.h>
#include <linux/gpio.h>
#include <linux/jiffies.h>
#include <soc/tegra/fuse-helper.h>
#include <linux/of.h>
#include <linux/of_device.h>
@@ -178,6 +179,10 @@ static int ufs_tegra_mphy_receiver_calibration(struct ufs_tegra_host *ufs_tegra,
MPHY_GO_BIT, mphy_rx_vendor2_reg);
}
/* Fuse register offset to know if chip is RDL part or not */
#define TEGRA_FUSE_OPT_LOT_CODE_0_0 0x108U
#define NON_RDL_STRUCTURE 0x90570c8
#define NON_RDL_LEAD 0x83c1002
if (ufs_tegra->x2config == true) {
/* Wait till lane calibration is done */
@@ -2289,6 +2294,24 @@ static int ufs_tegra_probe(struct platform_device *pdev)
{
int err;
struct device *dev = &pdev->dev;
unsigned int value;
if (tegra_platform_is_silicon()) {
/* Do not enable ufs on non-rdl part*/
err = tegra_fuse_readl(TEGRA_FUSE_OPT_LOT_CODE_0_0, &value);
if (err) {
dev_err(dev, "%s rdl fuse read failed err: %d val: %#x\n", __func__, err, value);
goto end;
}
if ((value == NON_RDL_STRUCTURE) ||
(value == NON_RDL_LEAD)) {
dev_info(dev, "%s This is non-rdl part. No support for UFS %#x\n", __func__, value);
err = -ENODEV;
goto end;
} else {
dev_dbg(dev, "%s This is rdl part. UFS is supported %#x\n", __func__, value);
}
}
/* Perform generic probe */
err = ufshcd_pltfrm_init(pdev, &ufs_hba_tegra_vops);
@@ -2296,6 +2319,7 @@ static int ufs_tegra_probe(struct platform_device *pdev)
if (err != -EPROBE_DEFER)
dev_err(dev, "ufshcd_pltfrm_init() failed %d\n", err);
}
end:
return err;
}