Instead of expensive register access on retrieving cmd_size
on each send, save the value during initialization in the private
context. The value doesn't change.
Signed-off-by: Tomas Winkler <tomas.wink...@intel.com>
---
drivers/char/tpm/tpm_crb.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
diff --git a/drivers/char/tpm/tpm_crb.c b/drivers/char/tpm/tpm_crb.c
index cf9aab698dfe..f8c9d587029b 100644
--- a/drivers/char/tpm/tpm_crb.c
+++ b/drivers/char/tpm/tpm_crb.c
@@ -81,6 +81,7 @@ struct crb_priv {
struct crb_control_area __iomem *cca;
u8 __iomem *cmd;
u8 __iomem *rsp;
+ u32 cmd_size;
};
/**
@@ -217,11 +218,9 @@ static int crb_send(struct tpm_chip *chip, u8 *buf, size_t
len)
struct crb_priv *priv = dev_get_drvdata(&chip->dev);
int rc = 0;
- if (len > ioread32(&priv->cca->cmd_size)) {
- dev_err(&chip->dev,
- "invalid command count value %x %zx\n",
- (unsigned int) len,
- (size_t) ioread32(&priv->cca->cmd_size));
+ if (len > priv->cmd_size) {
+ dev_err(&chip->dev, "invalid command count value %zd %d\n",
+ len, priv->cmd_size);
return -E2BIG;
}
@@ -374,6 +373,7 @@ static int crb_map_io(struct acpi_device *device, struct
crb_priv *priv,
ret = PTR_ERR(priv->cmd);
goto out;
}
+ priv->cmd_size = cmd_size;
memcpy_fromio(&rsp_pa, &priv->cca->rsp_pa, 8);
rsp_pa = le64_to_cpu(rsp_pa);
--
2.7.4
------------------------------------------------------------------------------
_______________________________________________
tpmdd-devel mailing list
tpmdd-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/tpmdd-devel
