Looks like you forgot v1 somewhere :-)
On Mon, Aug 24, 2020 at 09:21:58PM -0700, Badhri Jagan Sridharan wrote:
> TCPCI spec forbids direct access of TX_BUF_BYTE_x register.
> The existing version of tcpci driver assumes that those registers
> are directly addressible. Add support for tcpci chips which do
> not support direct access to TX_BUF_BYTE_x registers. TX_BUF_BYTE_x
> can only be accessed by I2C_WRITE_BYTE_COUNT.
>
> Signed-off-by: Badhri Jagan Sridharan <bad...@google.com>
> ---
> drivers/usb/typec/tcpm/tcpci.c | 49 +++++++++++++++++++++++++---------
> drivers/usb/typec/tcpm/tcpci.h | 8 ++++++
> 2 files changed, 44 insertions(+), 13 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index f57d91fd0e09..90d348caa6a8 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -320,8 +320,7 @@ static int tcpci_set_vbus(struct tcpc_dev *tcpc, bool
> source, bool sink)
> return 0;
> }
>
> -static int tcpci_pd_transmit(struct tcpc_dev *tcpc,
> - enum tcpm_transmit_type type,
> +static int tcpci_pd_transmit(struct tcpc_dev *tcpc, enum tcpm_transmit_type
> type,
> const struct pd_message *msg)
That does not look like a relevant change.
> {
> struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
> @@ -330,23 +329,47 @@ static int tcpci_pd_transmit(struct tcpc_dev *tcpc,
> int ret;
>
> cnt = msg ? pd_header_cnt(header) * 4 : 0;
> - ret = regmap_write(tcpci->regmap, TCPC_TX_BYTE_CNT, cnt + 2);
> - if (ret < 0)
> - return ret;
> + /**
> + * TCPCI spec forbids direct access of TCPC_TX_DATA.
> + * But, since some of the chipsets offer this capability,
> + * it's fair to support both.
> + */
> + if (!tcpci->data->TX_BUF_BYTE_x_hidden) {
Couldn't check if the flag is set first?
if (tcpci->data->TX_BUF_BYTE_x_hidden) {
...
> + ret = regmap_write(tcpci->regmap, TCPC_TX_BYTE_CNT, cnt + 2);
> + if (ret < 0)
> + return ret;
>
> - ret = tcpci_write16(tcpci, TCPC_TX_HDR, header);
> - if (ret < 0)
> - return ret;
> + ret = tcpci_write16(tcpci, TCPC_TX_HDR, header);
> + if (ret < 0)
> + return ret;
> +
> + if (cnt > 0) {
> + ret = regmap_raw_write(tcpci->regmap, TCPC_TX_DATA,
> &msg->payload, cnt);
> + if (ret < 0)
> + return ret;
> + }
> + } else {
> + u8 buf[TCPC_TRANSMIT_BUFFER_MAX_LEN] = {0,};
> + u8 pos = 0;
> +
> + /* Payload + header + TCPC_TX_BYTE_CNT */
> + buf[pos++] = cnt + 2;
> +
> + if (msg)
> + memcpy(&buf[pos], &msg->header, sizeof(msg->header));
> +
> + pos += sizeof(header);
> +
> + if (cnt > 0)
> + memcpy(&buf[pos], msg->payload, cnt);
>
> - if (cnt > 0) {
> - ret = regmap_raw_write(tcpci->regmap, TCPC_TX_DATA,
> - &msg->payload, cnt);
> + pos += cnt;
> + ret = regmap_raw_write(tcpci->regmap, TCPC_TX_BYTE_CNT, buf,
> pos);
> if (ret < 0)
> return ret;
> }
>
> - reg = (PD_RETRY_COUNT << TCPC_TRANSMIT_RETRY_SHIFT) |
> - (type << TCPC_TRANSMIT_TYPE_SHIFT);
> + reg = (PD_RETRY_COUNT << TCPC_TRANSMIT_RETRY_SHIFT) | (type <<
> TCPC_TRANSMIT_TYPE_SHIFT);
> ret = regmap_write(tcpci->regmap, TCPC_TRANSMIT, reg);
> if (ret < 0)
> return ret;
> diff --git a/drivers/usb/typec/tcpm/tcpci.h b/drivers/usb/typec/tcpm/tcpci.h
> index fd26ca35814c..cf9d8b63adcb 100644
> --- a/drivers/usb/typec/tcpm/tcpci.h
> +++ b/drivers/usb/typec/tcpm/tcpci.h
> @@ -128,9 +128,17 @@
> #define TCPC_VBUS_VOLTAGE_ALARM_HI_CFG 0x76
> #define TCPC_VBUS_VOLTAGE_ALARM_LO_CFG 0x78
>
> +/* I2C_WRITE_BYTE_COUNT + 1 when TX_BUF_BYTE_x is only accessible
> I2C_WRITE_BYTE_COUNT */
> +#define TCPC_TRANSMIT_BUFFER_MAX_LEN 31
> +
> +/*
> + * @TX_BUF_BYTE_x_hidden
> + * optional; Set when TX_BUF_BYTE_x can only be accessed through
> I2C_WRITE_BYTE_COUNT.
> + */
> struct tcpci;
> struct tcpci_data {
> struct regmap *regmap;
> + unsigned char TX_BUF_BYTE_x_hidden:1;
> int (*init)(struct tcpci *tcpci, struct tcpci_data *data);
> int (*set_vconn)(struct tcpci *tcpci, struct tcpci_data *data,
> bool enable);
> --
> 2.28.0.297.g1956fa8f8d-goog
thanks,
--
heikki
