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Message-ID: <20210212040947.GB103223@roeck-us.net>
Date: Thu, 11 Feb 2021 20:09:47 -0800
From: Guenter Roeck <linux@...ck-us.net>
To: Kyle Tso <kyletso@...gle.com>
Cc: heikki.krogerus@...ux.intel.com, gregkh@...uxfoundation.org,
hdegoede@...hat.com, robh+dt@...nel.org, badhri@...gle.com,
linux-usb@...r.kernel.org, linux-kernel@...r.kernel.org,
devicetree@...r.kernel.org
Subject: Re: [PATCH v6 2/7] usb: pd: Make SVDM Version configurable in VDM
header
On Fri, Feb 05, 2021 at 11:34:10AM +0800, Kyle Tso wrote:
> PD Rev 3.0 introduces SVDM Version 2.0. This patch makes the field
> configuable in the header in order to be able to be compatible with
> older SVDM version.
>
> Signed-off-by: Kyle Tso <kyletso@...gle.com>
Reviewed-by: Guenter Roeck <linux@...ck-us.net>
> ---
> Changes since v5:
> - no change
>
> drivers/usb/typec/altmodes/displayport.c | 2 +-
> drivers/usb/typec/tcpm/tcpm.c | 16 ++++++++--------
> drivers/usb/typec/ucsi/displayport.c | 6 +++---
> include/linux/usb/pd_vdo.h | 7 +++++--
> 4 files changed, 17 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
> index e62e5e3da01e..0abc3121238f 100644
> --- a/drivers/usb/typec/altmodes/displayport.c
> +++ b/drivers/usb/typec/altmodes/displayport.c
> @@ -15,7 +15,7 @@
> #include <linux/usb/typec_dp.h>
> #include "displayport.h"
>
> -#define DP_HEADER(_dp, cmd) (VDO((_dp)->alt->svid, 1, cmd) | \
> +#define DP_HEADER(_dp, cmd) (VDO((_dp)->alt->svid, 1, SVDM_VER_1_0, cmd) | \
> VDO_OPOS(USB_TYPEC_DP_MODE))
>
> enum {
> diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c
> index 8558ab006885..9aadb1e1bec5 100644
> --- a/drivers/usb/typec/tcpm/tcpm.c
> +++ b/drivers/usb/typec/tcpm/tcpm.c
> @@ -1544,17 +1544,17 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
> case CMD_DISCOVER_IDENT:
> /* 6.4.4.3.1 */
> svdm_consume_identity(port, p, cnt);
> - response[0] = VDO(USB_SID_PD, 1, CMD_DISCOVER_SVID);
> + response[0] = VDO(USB_SID_PD, 1, SVDM_VER_1_0, CMD_DISCOVER_SVID);
> rlen = 1;
> break;
> case CMD_DISCOVER_SVID:
> /* 6.4.4.3.2 */
> if (svdm_consume_svids(port, p, cnt)) {
> - response[0] = VDO(USB_SID_PD, 1,
> + response[0] = VDO(USB_SID_PD, 1, SVDM_VER_1_0,
> CMD_DISCOVER_SVID);
> rlen = 1;
> } else if (modep->nsvids && supports_modal(port)) {
> - response[0] = VDO(modep->svids[0], 1,
> + response[0] = VDO(modep->svids[0], 1, SVDM_VER_1_0,
> CMD_DISCOVER_MODES);
> rlen = 1;
> }
> @@ -1565,7 +1565,7 @@ static int tcpm_pd_svdm(struct tcpm_port *port, struct typec_altmode *adev,
> modep->svid_index++;
> if (modep->svid_index < modep->nsvids) {
> u16 svid = modep->svids[modep->svid_index];
> - response[0] = VDO(svid, 1, CMD_DISCOVER_MODES);
> + response[0] = VDO(svid, 1, SVDM_VER_1_0, CMD_DISCOVER_MODES);
> rlen = 1;
> } else {
> tcpm_register_partner_altmodes(port);
> @@ -1695,7 +1695,7 @@ static void tcpm_handle_vdm_request(struct tcpm_port *port,
> break;
> case ADEV_QUEUE_VDM_SEND_EXIT_MODE_ON_FAIL:
> if (typec_altmode_vdm(adev, p[0], &p[1], cnt)) {
> - response[0] = VDO(adev->svid, 1, CMD_EXIT_MODE);
> + response[0] = VDO(adev->svid, 1, SVDM_VER_1_0, CMD_EXIT_MODE);
> response[0] |= VDO_OPOS(adev->mode);
> rlen = 1;
> }
> @@ -1729,7 +1729,7 @@ static void tcpm_send_vdm(struct tcpm_port *port, u32 vid, int cmd,
>
> /* set VDM header with VID & CMD */
> header = VDO(vid, ((vid & USB_SID_PD) == USB_SID_PD) ?
> - 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), cmd);
> + 1 : (PD_VDO_CMD(cmd) <= CMD_ATTENTION), SVDM_VER_1_0, cmd);
> tcpm_queue_vdm(port, header, data, count);
> }
>
> @@ -2024,7 +2024,7 @@ static int tcpm_altmode_enter(struct typec_altmode *altmode, u32 *vdo)
> struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
> u32 header;
>
> - header = VDO(altmode->svid, vdo ? 2 : 1, CMD_ENTER_MODE);
> + header = VDO(altmode->svid, vdo ? 2 : 1, SVDM_VER_1_0, CMD_ENTER_MODE);
> header |= VDO_OPOS(altmode->mode);
>
> tcpm_queue_vdm_unlocked(port, header, vdo, vdo ? 1 : 0);
> @@ -2036,7 +2036,7 @@ static int tcpm_altmode_exit(struct typec_altmode *altmode)
> struct tcpm_port *port = typec_altmode_get_drvdata(altmode);
> u32 header;
>
> - header = VDO(altmode->svid, 1, CMD_EXIT_MODE);
> + header = VDO(altmode->svid, 1, SVDM_VER_1_0, CMD_EXIT_MODE);
> header |= VDO_OPOS(altmode->mode);
>
> tcpm_queue_vdm_unlocked(port, header, NULL, 0);
> diff --git a/drivers/usb/typec/ucsi/displayport.c b/drivers/usb/typec/ucsi/displayport.c
> index 261131c9e37c..1d387bddefb9 100644
> --- a/drivers/usb/typec/ucsi/displayport.c
> +++ b/drivers/usb/typec/ucsi/displayport.c
> @@ -83,7 +83,7 @@ static int ucsi_displayport_enter(struct typec_altmode *alt, u32 *vdo)
> * mode, and letting the alt mode driver continue.
> */
>
> - dp->header = VDO(USB_TYPEC_DP_SID, 1, CMD_ENTER_MODE);
> + dp->header = VDO(USB_TYPEC_DP_SID, 1, SVDM_VER_1_0, CMD_ENTER_MODE);
> dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
> dp->header |= VDO_CMDT(CMDT_RSP_ACK);
>
> @@ -120,7 +120,7 @@ static int ucsi_displayport_exit(struct typec_altmode *alt)
> if (ret < 0)
> goto out_unlock;
>
> - dp->header = VDO(USB_TYPEC_DP_SID, 1, CMD_EXIT_MODE);
> + dp->header = VDO(USB_TYPEC_DP_SID, 1, SVDM_VER_1_0, CMD_EXIT_MODE);
> dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
> dp->header |= VDO_CMDT(CMDT_RSP_ACK);
>
> @@ -200,7 +200,7 @@ static int ucsi_displayport_vdm(struct typec_altmode *alt,
>
> switch (cmd_type) {
> case CMDT_INIT:
> - dp->header = VDO(USB_TYPEC_DP_SID, 1, cmd);
> + dp->header = VDO(USB_TYPEC_DP_SID, 1, SVDM_VER_1_0, cmd);
> dp->header |= VDO_OPOS(USB_TYPEC_DP_MODE);
>
> switch (cmd) {
> diff --git a/include/linux/usb/pd_vdo.h b/include/linux/usb/pd_vdo.h
> index 5de7f550f93e..b057250704e8 100644
> --- a/include/linux/usb/pd_vdo.h
> +++ b/include/linux/usb/pd_vdo.h
> @@ -21,22 +21,24 @@
> * ----------
> * <31:16> :: SVID
> * <15> :: VDM type ( 1b == structured, 0b == unstructured )
> - * <14:13> :: Structured VDM version (can only be 00 == 1.0 currently)
> + * <14:13> :: Structured VDM version
> * <12:11> :: reserved
> * <10:8> :: object position (1-7 valid ... used for enter/exit mode only)
> * <7:6> :: command type (SVDM only?)
> * <5> :: reserved (SVDM), command type (UVDM)
> * <4:0> :: command
> */
> -#define VDO(vid, type, custom) \
> +#define VDO(vid, type, ver, custom) \
> (((vid) << 16) | \
> ((type) << 15) | \
> + ((ver) << 13) | \
> ((custom) & 0x7FFF))
>
> #define VDO_SVDM_TYPE (1 << 15)
> #define VDO_SVDM_VERS(x) ((x) << 13)
> #define VDO_OPOS(x) ((x) << 8)
> #define VDO_CMDT(x) ((x) << 6)
> +#define VDO_SVDM_VERS_MASK VDO_SVDM_VERS(0x3)
> #define VDO_OPOS_MASK VDO_OPOS(0x7)
> #define VDO_CMDT_MASK VDO_CMDT(0x3)
>
> @@ -74,6 +76,7 @@
>
> #define PD_VDO_VID(vdo) ((vdo) >> 16)
> #define PD_VDO_SVDM(vdo) (((vdo) >> 15) & 1)
> +#define PD_VDO_SVDM_VER(vdo) (((vdo) >> 13) & 0x3)
> #define PD_VDO_OPOS(vdo) (((vdo) >> 8) & 0x7)
> #define PD_VDO_CMD(vdo) ((vdo) & 0x1f)
> #define PD_VDO_CMDT(vdo) (((vdo) >> 6) & 0x3)
> --
> 2.30.0.365.g02bc693789-goog
>
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