[PATCH] i2c: imx: remove unnecessary delay at startup
Uwe Kleine-König
u.kleine-koenig at pengutronix.de
Mon Mar 14 03:13:37 PDT 2022
Hello,
On Mon, Mar 14, 2022 at 10:59:18AM +0100, Ian Dannapel wrote:
> diff --git a/drivers/i2c/busses/i2c-imx.c b/drivers/i2c/busses/i2c-imx.c
> index 3576b63a6c03..019dda5301df 100644
> --- a/drivers/i2c/busses/i2c-imx.c
> +++ b/drivers/i2c/busses/i2c-imx.c
> @@ -602,12 +602,6 @@ static int i2c_imx_start(struct imx_i2c_struct *i2c_imx, bool atomic)
> imx_i2c_write_reg(i2c_imx->hwdata->i2sr_clr_opcode, i2c_imx, IMX_I2C_I2SR);
> imx_i2c_write_reg(i2c_imx->hwdata->i2cr_ien_opcode, i2c_imx, IMX_I2C_I2CR);
>
> - /* Wait controller to be stable */
> - if (atomic)
> - udelay(50);
> - else
> - usleep_range(50, 150);
> -
> /* Start I2C transaction */
> temp = imx_i2c_read_reg(i2c_imx, IMX_I2C_I2CR);
> temp |= I2CR_MSTA;
This contradicts statements made in
43309f3b521302bb66c4c9e66704dd3675e4d725.
Maybe the sleep/delay should be done conditionally on the busy bit?
Best regards
Uwe
--
Pengutronix e.K. | Uwe Kleine-König |
Industrial Linux Solutions | https://www.pengutronix.de/ |
-------------- next part --------------
A non-text attachment was scrubbed...
Name: signature.asc
Type: application/pgp-signature
Size: 488 bytes
Desc: not available
URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20220314/965f3469/attachment.sig>
More information about the linux-arm-kernel
mailing list