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net: pse-pd: pd692x0: Preserve PSE configuration across reboots

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Detect when PSE hardware is already configured (user byte == 42) and
skip hardware initialization to prevent power interruption to connected
devices during system reboots.

Previously, the driver would always reconfigure the PSE hardware on
probe, causing a port matrix reflash that resulted in temporary power
loss to all connected devices. This change maintains power continuity
by preserving existing configuration when the PSE has been previously
initialized.

Signed-off-by: Kory Maincent <kory.maincent@bootlin.com>
Reviewed-by: Simon Horman <horms@kernel.org>
Link: https://patch.msgid.link/20251013-feature_pd692x0_reboot_keep_conf-v2-3-68ab082a93dd@bootlin.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Kory Maincent (Dent Project) 2025-10-13 16:05:33 +02:00 committed by Jakub Kicinski
parent 6fa1f8b64a
commit 8f3d044b34
1 changed files with 32 additions and 3 deletions
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35
drivers/net/pse-pd/pd692x0.c
View File

@ -30,6 +30,8 @@
#define PD692X0_FW_MIN_VER 5
#define PD692X0_FW_PATCH_VER 5
#define PD692X0_USER_BYTE 42
enum pd692x0_fw_state {
PD692X0_FW_UNKNOWN,
PD692X0_FW_OK,
@ -80,6 +82,7 @@ enum {
PD692X0_MSG_GET_PORT_PARAM,
PD692X0_MSG_GET_POWER_BANK,
PD692X0_MSG_SET_POWER_BANK,
PD692X0_MSG_SET_USER_BYTE,
/* add new message above here */
PD692X0_MSG_CNT
@ -103,6 +106,7 @@ struct pd692x0_priv {
bool last_cmd_key;
unsigned long last_cmd_key_time;
bool cfg_saved;
enum ethtool_c33_pse_admin_state admin_state[PD692X0_MAX_PIS];
struct regulator_dev *manager_reg[PD692X0_MAX_MANAGERS];
int manager_pw_budget[PD692X0_MAX_MANAGERS];
@ -193,6 +197,12 @@ static const struct pd692x0_msg pd692x0_msg_template_list[PD692X0_MSG_CNT] = {
.key = PD692X0_KEY_CMD,
.sub = {0x07, 0x0b, 0x57},
},
[PD692X0_MSG_SET_USER_BYTE] = {
.key = PD692X0_KEY_PRG,
.sub = {0x41, PD692X0_USER_BYTE},
.data = {0x4e, 0x4e, 0x4e, 0x4e,
0x4e, 0x4e, 0x4e, 0x4e},
},
};
static u8 pd692x0_build_msg(struct pd692x0_msg *msg, u8 echo)
@ -1233,6 +1243,15 @@ static void pd692x0_managers_free_pw_budget(struct pd692x0_priv *priv)
}
}
static int
pd692x0_save_user_byte(struct pd692x0_priv *priv)
{
struct pd692x0_msg msg, buf;
msg = pd692x0_msg_template_list[PD692X0_MSG_SET_USER_BYTE];
return pd692x0_sendrecv_msg(priv, &msg, &buf);
}
static int pd692x0_setup_pi_matrix(struct pse_controller_dev *pcdev)
{
struct pd692x0_priv *priv = to_pd692x0_priv(pcdev);
@ -1268,9 +1287,16 @@ static int pd692x0_setup_pi_matrix(struct pse_controller_dev *pcdev)
if (ret)
goto err_managers_req_pw;
ret = pd692x0_hw_conf_init(priv);
if (ret)
goto err_managers_req_pw;
/* Do not init the conf if it is already saved */
if (!priv->cfg_saved) {
ret = pd692x0_hw_conf_init(priv);
if (ret)
goto err_managers_req_pw;
ret = pd692x0_save_user_byte(priv);
if (ret)
goto err_managers_req_pw;
}
pd692x0_of_put_managers(priv, manager);
kfree(manager);
@ -1793,6 +1819,9 @@ static int pd692x0_i2c_probe(struct i2c_client *client)
}
}
if (buf.data[2] == PD692X0_USER_BYTE)
priv->cfg_saved = true;
priv->np = dev->of_node;
priv->pcdev.nr_lines = PD692X0_MAX_PIS;
priv->pcdev.owner = THIS_MODULE;