Tomasz Stanislawski wrote:
>
> The I2C HDMIPHY dedicated controller has different timeout
> handling and reset conditions.
>
> Signed-off-by: Tomasz Stanislawski <t.stanisl...@samsung.com>
> Signed-off-by: Kyungmin Park <kyungmin.p...@samsung.com>
> ---
> drivers/i2c/busses/i2c-s3c2410.c | 36
+++++++++++++++++++++++++++++++++++-
> 1 files changed, 35 insertions(+), 1 deletions(-)
>
Cc'ed Ben Dooks who is a maintainer of I2C and Samsung architecture also.
> diff --git a/drivers/i2c/busses/i2c-s3c2410.c b/drivers/i2c/busses/i2c-
> s3c2410.c
> index 6c00c10..99cfe2f 100644
> --- a/drivers/i2c/busses/i2c-s3c2410.c
> +++ b/drivers/i2c/busses/i2c-s3c2410.c
> @@ -54,6 +54,7 @@ enum s3c24xx_i2c_state {
> enum s3c24xx_i2c_type {
> TYPE_S3C2410,
> TYPE_S3C2440,
> + TYPE_S3C2440_HDMIPHY,
> };
>
> struct s3c24xx_i2c {
> @@ -96,7 +97,21 @@ static inline int s3c24xx_i2c_is2440(struct s3c24xx_i2c
> *i2c)
> enum s3c24xx_i2c_type type;
>
> type = platform_get_device_id(pdev)->driver_data;
> - return type == TYPE_S3C2440;
> + return type == TYPE_S3C2440 || type == TYPE_S3C2440_HDMIPHY;
> +}
> +
> +/* s3c24xx_i2c_is2440_hdmiphy()
> + *
> + * return true is this is an s3c2440 dedicated for HDMIPHY interface
> +*/
> +
> +static inline int s3c24xx_i2c_is2440_hdmiphy(struct s3c24xx_i2c *i2c)
> +{
> + struct platform_device *pdev = to_platform_device(i2c->dev);
> + enum s3c24xx_i2c_type type;
> +
> + type = platform_get_device_id(pdev)->driver_data;
> + return type == TYPE_S3C2440_HDMIPHY;
> }
>
> /* s3c24xx_i2c_master_complete
> @@ -461,6 +476,13 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c
> *i2c)
> unsigned long iicstat;
> int timeout = 400;
>
> + /* if hang-up of HDMIPHY occured reduce timeout
> + * The controller will work after reset, so waiting
> + * 400 ms will cause unneccessary system hangup
> + */
> + if (s3c24xx_i2c_is2440_hdmiphy(i2c))
> + timeout = 10;
> +
> while (timeout-- > 0) {
> iicstat = readl(i2c->regs + S3C2410_IICSTAT);
>
> @@ -470,6 +492,15 @@ static int s3c24xx_i2c_set_master(struct s3c24xx_i2c
> *i2c)
> msleep(1);
> }
>
> + /* hang-up of bus dedicated for HDMIPHY occured, resetting */
> + if (s3c24xx_i2c_is2440_hdmiphy(i2c)) {
> + writel(0, i2c->regs + S3C2410_IICCON);
> + writel(0, i2c->regs + S3C2410_IICSTAT);
> + writel(0, i2c->regs + S3C2410_IICDS);
> +
> + return 0;
> + }
> +
> return -ETIMEDOUT;
> }
>
> @@ -1009,6 +1040,9 @@ static struct platform_device_id
s3c24xx_driver_ids[] =
> {
> }, {
> .name = "s3c2440-i2c",
> .driver_data = TYPE_S3C2440,
> + }, {
> + .name = "s3c2440-hdmiphy-i2c",
> + .driver_data = TYPE_S3C2440_HDMIPHY,
> }, { },
> };
> MODULE_DEVICE_TABLE(platform, s3c24xx_driver_ids);
> --
Thanks.
Best regards,
Kgene.
--
Kukjin Kim <kgene....@samsung.com>, Senior Engineer,
SW Solution Development Team, Samsung Electronics Co., Ltd.
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