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can: mcp251xfd: __mcp251xfd_chip_set_mode(): prepare for PLL support: improve error handling and diagnostics

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This patch prepares the __mcp251xfd_chip_set_mode() function for PLL
support by adding more error checks and diagnostics.

Link: https://lore.kernel.org/all/20220207131047.282110-13-mkl@pengutronix.de
Signed-off-by: Marc Kleine-Budde <mkl@pengutronix.de>
This commit is contained in:
Marc Kleine-Budde 2020-10-21 10:33:58 +02:00
parent 1a4abba640
commit a10fd91e42
1 changed files with 31 additions and 10 deletions
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41
drivers/net/can/spi/mcp251xfd/mcp251xfd-core.c
View file

@ -218,34 +218,55 @@ static int
__mcp251xfd_chip_set_mode(const struct mcp251xfd_priv *priv,
const u8 mode_req, bool nowait)
{
u32 con, con_reqop;
u32 con = 0, con_reqop, osc = 0;
u8 mode;
int err;
con_reqop = FIELD_PREP(MCP251XFD_REG_CON_REQOP_MASK, mode_req);
err = regmap_update_bits(priv->map_reg, MCP251XFD_REG_CON,
MCP251XFD_REG_CON_REQOP_MASK, con_reqop);
if (err)
if (err == -EBADMSG) {
netdev_err(priv->ndev,
"Failed to set Requested Operation Mode.\n");
return -ENODEV;
} else if (err) {
return err;
}
if (mode_req == MCP251XFD_REG_CON_MODE_SLEEP || nowait)
return 0;
err = regmap_read_poll_timeout(priv->map_reg, MCP251XFD_REG_CON, con,
!mcp251xfd_reg_invalid(con) &&
FIELD_GET(MCP251XFD_REG_CON_OPMOD_MASK,
con) == mode_req,
MCP251XFD_POLL_SLEEP_US,
MCP251XFD_POLL_TIMEOUT_US);
if (err) {
u8 mode = FIELD_GET(MCP251XFD_REG_CON_OPMOD_MASK, con);
netdev_err(priv->ndev,
"Controller failed to enter mode %s Mode (%u) and stays in %s Mode (%u).\n",
mcp251xfd_get_mode_str(mode_req), mode_req,
mcp251xfd_get_mode_str(mode), mode);
if (err != -ETIMEDOUT && err != -EBADMSG)
return err;
/* Ignore return value.
* Print below error messages, even if this fails.
*/
regmap_read(priv->map_reg, MCP251XFD_REG_OSC, &osc);
if (mcp251xfd_reg_invalid(con)) {
netdev_err(priv->ndev,
"Failed to read CAN Control Register (con=0x%08x, osc=0x%08x).\n",
con, osc);
return -ENODEV;
}
return 0;
mode = FIELD_GET(MCP251XFD_REG_CON_OPMOD_MASK, con);
netdev_err(priv->ndev,
"Controller failed to enter mode %s Mode (%u) and stays in %s Mode (%u) (con=0x%08x, osc=0x%08x).\n",
mcp251xfd_get_mode_str(mode_req), mode_req,
mcp251xfd_get_mode_str(mode), mode,
con, osc);
return -ETIMEDOUT;
}
static inline int