Re: [PATCH v2 4/4] usb: typec: tipd: add patch update support for tps6598x

[Heikki Krogerus <heikki.krogerus@linux.intel.com>]

On Thu, Dec 14, 2023 at 05:29:12PM +0100, Javier Carrasco wrote:
> The TPS6598x PD controller supports firmware updates that can be loaded
> either from an external flash memory or a host using the device's I2C
> host interface. This patch implements the second approach, which is
> especially relevant if no flash memory is available.
> 
> In order to make patch bundle updates, a series of tasks (special
> commands) must be sent to the device as it is documented in the
> TPS65987DDH and TPS65988DH Host Interface Technical Reference Manual[1],
> section 4.11 (Patch Bundle Update Tasks).
> 
> The update sequence is as follows:
> 1. PTCs - Start Patch Load Sequence: the proposed approach includes
>    device and application configuration data.
> 2. PTCd - Patch Download: 64-byte data chunks must be sent until the end
>    of the firmware file is reached (the last chunk may be shorter).
> 3. PTCc - Patch Data Transfer Complete: ends the patch loading sequence.
> 
> After this sequence and if no errors occurred, the device will change
> its mode to 'APP' after SETUP_MS milliseconds, and then it will be ready
> for normal operation.
> 
> [1] https://www.ti.com/lit/ug/slvubh2b/slvubh2b.pdf?ts=1697623299919&ref_url=https%253A%252F%252Fwww.ti.com%252Fproduct%252FTPS65987D
> 
> Signed-off-by: Javier Carrasco <javier.carrasco@wolfvision.net>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
>  drivers/usb/typec/tipd/core.c     | 68 ++++++++++++++++++++++++++++++++++++++-
>  drivers/usb/typec/tipd/tps6598x.h | 18 +++++++++++
>  2 files changed, 85 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/usb/typec/tipd/core.c b/drivers/usb/typec/tipd/core.c
> index 7f4bbc0629b0..a956eb976906 100644
> --- a/drivers/usb/typec/tipd/core.c
> +++ b/drivers/usb/typec/tipd/core.c
> @@ -1125,6 +1125,71 @@ static int tps25750_apply_patch(struct tps6598x *tps)
>  	return 0;
>  };
>  
> +static int tps6598x_apply_patch(struct tps6598x *tps)
> +{
> +	u8 in = TPS_PTCS_CONTENT_DEV | TPS_PTCS_CONTENT_APP;
> +	u8 out[TPS_MAX_LEN] = {0};
> +	size_t in_len = sizeof(in);
> +	size_t copied_bytes = 0;
> +	size_t bytes_left;
> +	const struct firmware *fw;
> +	const char *firmware_name;
> +	int ret;
> +
> +	ret = device_property_read_string(tps->dev, "firmware-name",
> +					  &firmware_name);
> +	if (ret)
> +		return ret;
> +
> +	ret = tps_request_firmware(tps, &fw);
> +	if (ret)
> +		return ret;
> +
> +	ret = tps6598x_exec_cmd(tps, "PTCs", in_len, &in,
> +				TPS_PTCS_OUT_BYTES, out);
> +	if (ret || out[TPS_PTCS_STATUS] == TPS_PTCS_STATUS_FAIL) {
> +		if (!ret)
> +			ret = -EBUSY;
> +		dev_err(tps->dev, "Update start failed (%d)\n", ret);
> +		goto release_fw;
> +	}
> +
> +	bytes_left = fw->size;
> +	while (bytes_left) {
> +		if (bytes_left < TPS_MAX_LEN)
> +			in_len = bytes_left;
> +		else
> +			in_len = TPS_MAX_LEN;
> +		ret = tps6598x_exec_cmd(tps, "PTCd", in_len,
> +					fw->data + copied_bytes,
> +					TPS_PTCD_OUT_BYTES, out);
> +		if (ret || out[TPS_PTCD_TRANSFER_STATUS] ||
> +		    out[TPS_PTCD_LOADING_STATE] == TPS_PTCD_LOAD_ERR) {
> +			if (!ret)
> +				ret = -EBUSY;
> +			dev_err(tps->dev, "Patch download failed (%d)\n", ret);
> +			goto release_fw;
> +		}
> +		copied_bytes += in_len;
> +		bytes_left -= in_len;
> +	}
> +
> +	ret = tps6598x_exec_cmd(tps, "PTCc", 0, NULL, TPS_PTCC_OUT_BYTES, out);
> +	if (ret || out[TPS_PTCC_DEV] || out[TPS_PTCC_APP]) {
> +		if (!ret)
> +			ret = -EBUSY;
> +		dev_err(tps->dev, "Update completion failed (%d)\n", ret);
> +		goto release_fw;
> +	}
> +	msleep(TPS_SETUP_MS);
> +	dev_info(tps->dev, "Firmware update succeeded\n");
> +
> +release_fw:
> +	release_firmware(fw);
> +
> +	return ret;
> +};
> +
>  static int cd321x_init(struct tps6598x *tps)
>  {
>  	return 0;
> @@ -1150,7 +1215,7 @@ static int tps25750_init(struct tps6598x *tps)
>  
>  static int tps6598x_init(struct tps6598x *tps)
>  {
> -	return 0;
> +	return tps->data->apply_patch(tps);
>  }
>  
>  static int cd321x_reset(struct tps6598x *tps)
> @@ -1468,6 +1533,7 @@ static const struct tipd_data tps6598x_data = {
>  	.register_port = tps6598x_register_port,
>  	.trace_power_status = trace_tps6598x_power_status,
>  	.trace_status = trace_tps6598x_status,
> +	.apply_patch = tps6598x_apply_patch,
>  	.init = tps6598x_init,
>  	.reset = tps6598x_reset,
>  };
> diff --git a/drivers/usb/typec/tipd/tps6598x.h b/drivers/usb/typec/tipd/tps6598x.h
> index 01609bf509e4..89b24519463a 100644
> --- a/drivers/usb/typec/tipd/tps6598x.h
> +++ b/drivers/usb/typec/tipd/tps6598x.h
> @@ -235,4 +235,22 @@
>  /* SLEEP CONF REG */
>  #define TPS_SLEEP_CONF_SLEEP_MODE_ALLOWED	BIT(0)
>  
> +/* Start Patch Download Sequence */
> +#define TPS_PTCS_CONTENT_APP			BIT(0)
> +#define TPS_PTCS_CONTENT_DEV			BIT(1)
> +#define TPS_PTCS_OUT_BYTES			4
> +#define TPS_PTCS_STATUS				1
> +
> +#define TPS_PTCS_STATUS_FAIL			0x80
> +/* Patch Download */
> +#define TPS_PTCD_OUT_BYTES			10
> +#define TPS_PTCD_TRANSFER_STATUS		1
> +#define TPS_PTCD_LOADING_STATE			2
> +
> +#define TPS_PTCD_LOAD_ERR			0x09
> +/* Patch Download Complete */
> +#define TPS_PTCC_OUT_BYTES			4
> +#define TPS_PTCC_DEV				2
> +#define TPS_PTCC_APP				3
> +
>  #endif /* __TPS6598X_H__ */
> 
> -- 
> 2.39.2

-- 
heikki