Hi Ajay, I'm really sorry for being so late with the review.
On Mon, Aug 05, 2019 at 11:24:13AM -0700, Ajay Gupta wrote: > From: Ajay Gupta <aj...@nvidia.com> > > CCGx controller used on NVIDIA GPU card has two separate display > altmode for two DP pin assignments. UCSI specification doesn't > prohibits using separate display altmode. > > Current UCSI Type-C framework expects only one display altmode for > all DP pin assignment. This patch squashes two separate display > altmode into single altmode to support controllers with separate > display altmode. We first read all the alternate modes of connector > and then run through it to know if there are separate display > altmodes. If so, it prepares a new port altmode set after squashing > two or more separate altmodes into one. > > Signed-off-by: Ajay Gupta <aj...@nvidia.com> > --- > Original discussion on this issue is at [1] > > Change from v1->v2 > - Fix ucsi->ppm NULL check in ucsi_sync based on > comment from an automated email from someone (I lost the email). > > 1. https://marc.info/?l=linux-usb&m=154905866830998&w=2 > > drivers/usb/typec/ucsi/ucsi.c | 212 ++++++++++++++++++++++++++++++++-- > drivers/usb/typec/ucsi/ucsi.h | 12 ++ > 2 files changed, 217 insertions(+), 7 deletions(-) > > diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c > index ba288b964dc8..68ea66fcaa0e 100644 > --- a/drivers/usb/typec/ucsi/ucsi.c > +++ b/drivers/usb/typec/ucsi/ucsi.c > @@ -39,11 +39,37 @@ > */ > #define UCSI_SWAP_TIMEOUT_MS 5000 > > +static void ucsi_update_get_current_cam_cmd(struct ucsi_connector *con, > + struct ucsi_data *data) > +{ > + u8 cam, new_cam; > + > + if (data->cci.data_length == 0x1) { > + cam = data->message_in[0]; > + new_cam = con->port_alt[cam].linked_idx; > + data->message_in[0] = new_cam; > + con->new_port_alt[new_cam].active_idx = cam; > + } > +} > + > static inline int ucsi_sync(struct ucsi *ucsi) > { > - if (ucsi->ppm && ucsi->ppm->sync) > - return ucsi->ppm->sync(ucsi->ppm); > - return 0; > + struct ucsi_connector *con = ucsi->connector; > + struct ucsi_data *data; > + int ret = 0; > + > + if (ucsi->ppm && ucsi->ppm->sync) { > + ret = ucsi->ppm->sync(ucsi->ppm); > + if (ret) > + return ret; > + > + data = ucsi->ppm->data; > + if (data->ctrl.alt.cmd == UCSI_GET_CURRENT_CAM && > + con->has_multiple_dp) > + ucsi_update_get_current_cam_cmd(con, data); Since you are capturing commands, then couldn't this be initially handled in ucsi_ccg.c? > + } > + > + return ret; > } > > static int ucsi_command(struct ucsi *ucsi, struct ucsi_control *ctrl) > @@ -101,14 +127,65 @@ static int ucsi_ack(struct ucsi *ucsi, u8 ack) > return ret; > } > > +static void ucsi_update_set_new_cam_cmd(struct ucsi_connector *con, > + struct ucsi_control *ctrl) > +{ > + struct new_ucsi_altmode *new_port, *port; > + struct typec_altmode *alt = NULL; > + u64 cmd; > + u8 new_cam, cam, pin; > + bool enter_new_mode; > + int i, j, k = 0xff; > + > + cmd = ctrl->raw_cmd; > + new_cam = (cmd >> 24) & 0xff; > + new_port = &con->new_port_alt[new_cam]; > + cam = new_port->linked_idx; > + enter_new_mode = (cmd >> 23) & 1; > + > + if (cam == UCSI_MULTI_LINKED_INDEX) { > + if (enter_new_mode) { > + port = con->port_alt; You could have set that earlier, no? > + for (i = 0; con->partner_altmode[i]; i++) { > + alt = con->partner_altmode[i]; > + if (alt->svid == new_port->svid) > + break; > + } Why do you enter the next loop even if !alt? > + for (j = 0; port[j].svid; j++) { > + pin = DP_CONF_GET_PIN_ASSIGN(port[j].mid); > + if (alt && port[j].svid == alt->svid && > + (pin & DP_CONF_GET_PIN_ASSIGN(alt->vdo))) { > + /* prioritize pin E->D->C */ > + if (k == 0xff || (k != 0xff && pin > > + DP_CONF_GET_PIN_ASSIGN(port[k].mid)) > + ) { > + k = j; > + } > + } > + } That is really difficult to read, let alone understand. You are making assumption here that the alt mode is always DP alt? > + cam = k; > + new_port->active_idx = cam; > + } else { > + cam = new_port->active_idx; > + } > + } You have a lot of nested stuff here. Please see if you can improve the above code. > + cmd &= ~(0xff << 24); I'm not sure I understand why couldn't the cmd be 0 before this point? Actually, do you even need that variable for anything? > + cmd |= (cam << 24); > + ctrl->raw_cmd = cmd; Couldn't you just update ctrl->raw_cmd directly? > +} > + > static int ucsi_run_command(struct ucsi *ucsi, struct ucsi_control *ctrl, > void *data, size_t size) > { > struct ucsi_control _ctrl; > + struct ucsi_connector *con = ucsi->connector; > u8 data_length; > u16 error; > int ret; > > + if (ctrl->alt.cmd == UCSI_SET_NEW_CAM && con->has_multiple_dp) > + ucsi_update_set_new_cam_cmd(con, ctrl); > + > ret = ucsi_command(ucsi, ctrl); > if (ret) > goto err; > @@ -364,10 +441,24 @@ static int ucsi_register_altmodes(struct ucsi_connector > *con, u8 recipient) > > for (i = 0; i < max_altmodes;) { > memset(alt, 0, sizeof(alt)); > - UCSI_CMD_GET_ALTERNATE_MODES(ctrl, recipient, con->num, i, 1); > - len = ucsi_run_command(con->ucsi, &ctrl, alt, sizeof(alt)); > - if (len <= 0) > - return len; > + > + if (recipient == UCSI_RECIPIENT_CON) { > + if (con->has_multiple_dp) { > + alt[0].svid = con->new_port_alt[i].svid; > + alt[0].mid = con->new_port_alt[i].mid; > + } else { > + alt[0].svid = con->port_alt[i].svid; > + alt[0].mid = con->port_alt[i].mid; > + } > + len = sizeof(alt[0]); > + } else { > + UCSI_CMD_GET_ALTERNATE_MODES(ctrl, recipient, > + con->num, i, 1); > + len = ucsi_run_command(con->ucsi, &ctrl, alt, > + sizeof(alt)); > + if (len <= 0) > + return len; > + } > > /* > * This code is requesting one alt mode at a time, but some PPMs > @@ -521,6 +612,103 @@ static void ucsi_partner_change(struct ucsi_connector > *con) > ucsi_altmode_update_active(con); > } > > +static void ucsi_update_con_altmodes(struct ucsi_connector *con) > +{ > + int max_altmodes = con->ucsi->cap.num_alt_modes; > + struct new_ucsi_altmode *alt, *new_alt; > + int i, j, k = 0; > + bool found = false; > + > + alt = con->port_alt; > + new_alt = con->new_port_alt; > + memset(con->new_port_alt, 0, sizeof(con->new_port_alt)); > + > + for (i = 0; i < max_altmodes; i++) { > + if (!alt[i].svid) > + break; > + > + /* already checked and considered */ > + if (alt[i].checked) > + continue; > + > + if (!DP_CONF_GET_PIN_ASSIGN(alt[i].mid)) { > + /* Found Non DP altmode */ > + new_alt[k].svid = alt[i].svid; > + new_alt[k].mid |= alt[i].mid; > + new_alt[k].linked_idx = i; > + alt[i].linked_idx = k; > + k++; > + continue; > + } > + > + for (j = i + 1; j < max_altmodes; j++) { > + if (alt[i].svid != alt[j].svid || > + !DP_CONF_GET_PIN_ASSIGN(alt[j].mid)) { > + continue; > + } else { > + /* Found duplicate DP mode */ > + new_alt[k].svid = alt[i].svid; > + new_alt[k].mid |= alt[i].mid | alt[j].mid; > + new_alt[k].linked_idx = UCSI_MULTI_LINKED_INDEX; > + alt[i].linked_idx = k; > + alt[j].linked_idx = k; > + alt[j].checked = true; > + found = true; > + } > + } > + if (found) { > + con->has_multiple_dp = true; > + } else { > + /* Didn't find any duplicate DP altmode */ > + new_alt[k].svid = alt[i].svid; > + new_alt[k].mid |= alt[i].mid; > + new_alt[k].linked_idx = i; > + alt[i].linked_idx = k; > + } > + k++; > + } > +} > + > +static int ucsi_get_altmodes(struct ucsi_connector *con) > +{ > + int max_altmodes = con->ucsi->cap.num_alt_modes; > + struct ucsi_altmode alt[2]; > + struct ucsi_control ctrl; > + int num = 1; > + int len; > + int j; > + int i; > + int k = 0; > + > + memset(con->port_alt, 0, sizeof(con->port_alt)); > + > + for (i = 0; i < max_altmodes;) { > + memset(alt, 0, sizeof(alt)); > + UCSI_CMD_GET_ALTERNATE_MODES(ctrl, UCSI_RECIPIENT_CON, > + con->num, i, 1); > + len = ucsi_run_command(con->ucsi, &ctrl, alt, sizeof(alt)); > + if (len <= 0) > + return len; > + > + /* > + * This code is requesting one alt mode at a time, but some PPMs > + * may still return two. > + */ > + num = len / sizeof(alt[0]); > + i += num; > + > + for (j = 0; j < num; j++) { > + if (!alt[j].svid) > + return 0; > + > + con->port_alt[k].mid = alt[j].mid; > + con->port_alt[k].svid = alt[j].svid; > + k++; > + } > + } > + return 0; > +} > + > static void ucsi_connector_change(struct work_struct *work) > { > struct ucsi_connector *con = container_of(work, struct ucsi_connector, > @@ -851,6 +1039,16 @@ static int ucsi_register_port(struct ucsi *ucsi, int > index) > if (IS_ERR(con->port)) > return PTR_ERR(con->port); > > + /* Get Alternate modes */ > + ret = ucsi_get_altmodes(con); > + if (ret) { > + dev_err(ucsi->dev, > + "%s: con%d failed (%d)to get port alternate modes\n", > + __func__, con->num, ret); > + return 0; > + } > + ucsi_update_con_altmodes(con); Instead of first collecting all the connector alt modes, and then processing them, why not just process every connector alt mode right after getting it? > /* Alternate modes */ > ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_CON); > if (ret) > diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h > index de87d0b8319d..7bbdf83c8d4a 100644 > --- a/drivers/usb/typec/ucsi/ucsi.h > +++ b/drivers/usb/typec/ucsi/ucsi.h > @@ -274,6 +274,15 @@ struct ucsi_connector_capability { > u8:6; /* reserved */ > } __packed; > > +struct new_ucsi_altmode { > + u16 svid; > + u32 mid; > + u8 linked_idx; > + u8 active_idx; > +#define UCSI_MULTI_LINKED_INDEX (0xff) > + bool checked; > +} __packed; The name "new_ucsi_altmode" is a not clear to me. Why don't you just have a pointer to struct ucsi_altmode in that structure? I'm not sure you really need those linked_idx, active_idx and checked members. > + > struct ucsi_altmode { > u16 svid; > u32 mid; > @@ -408,6 +417,7 @@ struct ucsi { > > struct ucsi_connector { > int num; > + bool has_multiple_dp; > > struct ucsi *ucsi; > struct mutex lock; /* port lock */ > @@ -424,6 +434,8 @@ struct ucsi_connector { > > struct ucsi_connector_status status; > struct ucsi_connector_capability cap; > + struct new_ucsi_altmode port_alt[UCSI_MAX_ALTMODES]; > + struct new_ucsi_altmode new_port_alt[UCSI_MAX_ALTMODES]; I'm pretty sure you don't need two of those. You should be able to handle this with a pointer to the correct port_altmode member inside your structure. You can also add a member to your structure that is pointer to another structure of the same type: struct my_ucsi_altmode { u16 svid; u32 mid; struct ucsi_altmode *port_altmode; struct my_ucsi_altmode *companion[UCSI_MAX_ALTMODES]; }; But I pretty sure pointer to the correct port_altmode is enough: struct my_ucsi_altmode { u16 svid; u32 mid; struct ucsi_altmode *port_altmode; }; > }; I don't think there is anything preventing all this from being done in ucsi_ccg.c initially. I don't think we need to touch ucsi.h nor ucsi.c at all at this point. So just collect the connector alternate modes for example into struct ucsi_ccg instead of struct ucsi_connector, and then process the commands that need to be handled separately in ucsi_ccg_cmd(). thanks, -- heikki
