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Date: Tue, 19 Dec 2023 15:24:18 +0200
From: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
To: Javier Carrasco <javier.carrasco@...fvision.net>
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 4/4] usb: typec: tipd: add patch update support for
tps6598x
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@...fvision.net>
Reviewed-by: Heikki Krogerus <heikki.krogerus@...ux.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
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