diff mbox

[RFC,V2,12/12] i2c: bcm-iproc: make use of the new infrastructure for quirks

Message ID 1424880126-15047-13-git-send-email-wsa@the-dreams.de (mailing list archive)
State New, archived
Headers show

Commit Message

Wolfram Sang Feb. 25, 2015, 4:02 p.m. UTC
From: Wolfram Sang <wsa+renesas@sang-engineering.com>

Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
---
 drivers/i2c/busses/i2c-bcm-iproc.c | 15 +++++++--------
 1 file changed, 7 insertions(+), 8 deletions(-)

Comments

Ray Jui Feb. 26, 2015, 11:32 p.m. UTC | #1
On 2/25/2015 8:02 AM, Wolfram Sang wrote:
> From: Wolfram Sang <wsa+renesas@sang-engineering.com>
> 
> Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
> ---
>  drivers/i2c/busses/i2c-bcm-iproc.c | 15 +++++++--------
>  1 file changed, 7 insertions(+), 8 deletions(-)
> 
> diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
> index d3c89157b33774..f9f2c2082151e2 100644
> --- a/drivers/i2c/busses/i2c-bcm-iproc.c
> +++ b/drivers/i2c/busses/i2c-bcm-iproc.c
> @@ -160,14 +160,6 @@ static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
>  	u32 val;
>  	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
>  
> -	/* need to reserve one byte in the FIFO for the slave address */
> -	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
> -		dev_err(iproc_i2c->device,
> -			"only support data length up to %u bytes\n",
> -			M_TX_RX_FIFO_SIZE - 1);
> -		return -EOPNOTSUPP;
> -	}
> -
>  	/* check if bus is busy */
>  	if (!!(readl(iproc_i2c->base + M_CMD_OFFSET) &
>  	       BIT(M_CMD_START_BUSY_SHIFT))) {
> @@ -287,6 +279,12 @@ static const struct i2c_algorithm bcm_iproc_algo = {
>  	.functionality = bcm_iproc_i2c_functionality,
>  };
>  
> +static struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
> +	/* need to reserve one byte in the FIFO for the slave address */
> +	.max_read_len = M_TX_RX_FIFO_SIZE - 1,
> +	.max_write_len = M_TX_RX_FIFO_SIZE - 1,
> +};
> +
>  static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
>  {
>  	unsigned int bus_speed;
> @@ -413,6 +411,7 @@ static int bcm_iproc_i2c_probe(struct platform_device *pdev)
>  	i2c_set_adapdata(adap, iproc_i2c);
>  	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
>  	adap->algo = &bcm_iproc_algo;
> +	adap->quirks = &bcm_iproc_i2c_quirks;
>  	adap->dev.parent = &pdev->dev;
>  	adap->dev.of_node = pdev->dev.of_node;
>  
> 

Change on the iproc i2c driver looks good to me. Sanity tested the
change from Wolfram's i2c/quirks branch on Cygnus 958300K combo board.
Sanity tested with an attempt to transfer large amount of I2C data to
ensure the transfer is denied by the i2c-core:

/ # cat /dev/i2c-0
[  657.310261] i2c i2c-0: quirk: msg too long (addr 0x0000, size 4096, read)

Reviewed-by: Ray Jui <rjui@broadcom.com>
Tested-by: Ray Jui <rjui@broadcom.com>

Thanks,

Ray
Wolfram Sang March 12, 2015, 2:56 p.m. UTC | #2
> Change on the iproc i2c driver looks good to me. Sanity tested the
> change from Wolfram's i2c/quirks branch on Cygnus 958300K combo board.
> Sanity tested with an attempt to transfer large amount of I2C data to
> ensure the transfer is denied by the i2c-core:
> 
> / # cat /dev/i2c-0
> [  657.310261] i2c i2c-0: quirk: msg too long (addr 0x0000, size 4096, read)
> 
> Reviewed-by: Ray Jui <rjui@broadcom.com>
> Tested-by: Ray Jui <rjui@broadcom.com>

Thanks for testing, and especially describing your test! Much
appreciated.
diff mbox

Patch

diff --git a/drivers/i2c/busses/i2c-bcm-iproc.c b/drivers/i2c/busses/i2c-bcm-iproc.c
index d3c89157b33774..f9f2c2082151e2 100644
--- a/drivers/i2c/busses/i2c-bcm-iproc.c
+++ b/drivers/i2c/busses/i2c-bcm-iproc.c
@@ -160,14 +160,6 @@  static int bcm_iproc_i2c_xfer_single_msg(struct bcm_iproc_i2c_dev *iproc_i2c,
 	u32 val;
 	unsigned long time_left = msecs_to_jiffies(I2C_TIMEOUT_MESC);
 
-	/* need to reserve one byte in the FIFO for the slave address */
-	if (msg->len > M_TX_RX_FIFO_SIZE - 1) {
-		dev_err(iproc_i2c->device,
-			"only support data length up to %u bytes\n",
-			M_TX_RX_FIFO_SIZE - 1);
-		return -EOPNOTSUPP;
-	}
-
 	/* check if bus is busy */
 	if (!!(readl(iproc_i2c->base + M_CMD_OFFSET) &
 	       BIT(M_CMD_START_BUSY_SHIFT))) {
@@ -287,6 +279,12 @@  static const struct i2c_algorithm bcm_iproc_algo = {
 	.functionality = bcm_iproc_i2c_functionality,
 };
 
+static struct i2c_adapter_quirks bcm_iproc_i2c_quirks = {
+	/* need to reserve one byte in the FIFO for the slave address */
+	.max_read_len = M_TX_RX_FIFO_SIZE - 1,
+	.max_write_len = M_TX_RX_FIFO_SIZE - 1,
+};
+
 static int bcm_iproc_i2c_cfg_speed(struct bcm_iproc_i2c_dev *iproc_i2c)
 {
 	unsigned int bus_speed;
@@ -413,6 +411,7 @@  static int bcm_iproc_i2c_probe(struct platform_device *pdev)
 	i2c_set_adapdata(adap, iproc_i2c);
 	strlcpy(adap->name, "Broadcom iProc I2C adapter", sizeof(adap->name));
 	adap->algo = &bcm_iproc_algo;
+	adap->quirks = &bcm_iproc_i2c_quirks;
 	adap->dev.parent = &pdev->dev;
 	adap->dev.of_node = pdev->dev.of_node;