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net: mscc: ocelot: Register poll timeout should be wall time not attempts 

When doing indirect access in the Ocelot chip, a command is setup,
issued and then we need to poll until the result is ready. The polling
timeout is specified in milliseconds in the datasheet and not in
register access attempts.
It is not a bug on the currently supported platform, but we observed
that the code does not work properly on other platforms that we want to
support as the timing requirements there are different.

Signed-off-by: Steen Hegelund <steen.hegelund@microchip.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Steen Hegelund 2018-12-20 14:16:31 +01:00 committed by David S. Miller
parent 463561e6b9
commit 639c1b2625
1 changed files with 27 additions and 28 deletions
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55
drivers/net/ethernet/mscc/ocelot.c
View File

@ -15,6 +15,7 @@
#include <linux/netdevice.h>
#include <linux/phy.h>
#include <linux/skbuff.h>
#include <linux/iopoll.h>
#include <net/arp.h>
#include <net/netevent.h>
#include <net/rtnetlink.h>
@ -22,6 +23,9 @@
#include "ocelot.h"
#define TABLE_UPDATE_SLEEP_US 10
#define TABLE_UPDATE_TIMEOUT_US 100000
/* MAC table entry types.
* ENTRYTYPE_NORMAL is subject to aging.
* ENTRYTYPE_LOCKED is not subject to aging.
@ -41,23 +45,20 @@ struct ocelot_mact_entry {
enum macaccess_entry_type type;
};
static inline u32 ocelot_mact_read_macaccess(struct ocelot *ocelot)
{
return ocelot_read(ocelot, ANA_TABLES_MACACCESS);
}
static inline int ocelot_mact_wait_for_completion(struct ocelot *ocelot)
{
unsigned int val, timeout = 10;
u32 val;
/* Wait for the issued mac table command to be completed, or timeout.
* When the command read from ANA_TABLES_MACACCESS is
* MACACCESS_CMD_IDLE, the issued command completed successfully.
*/
do {
val = ocelot_read(ocelot, ANA_TABLES_MACACCESS);
val &= ANA_TABLES_MACACCESS_MAC_TABLE_CMD_M;
} while (val != MACACCESS_CMD_IDLE && timeout--);
if (!timeout)
return -ETIMEDOUT;
return 0;
return readx_poll_timeout(ocelot_mact_read_macaccess,
ocelot, val,
(val & ANA_TABLES_MACACCESS_MAC_TABLE_CMD_M) ==
MACACCESS_CMD_IDLE,
TABLE_UPDATE_SLEEP_US, TABLE_UPDATE_TIMEOUT_US);
}
static void ocelot_mact_select(struct ocelot *ocelot,
@ -129,23 +130,21 @@ static void ocelot_mact_init(struct ocelot *ocelot)
ocelot_write(ocelot, MACACCESS_CMD_INIT, ANA_TABLES_MACACCESS);
}
static inline u32 ocelot_vlant_read_vlanaccess(struct ocelot *ocelot)
{
return ocelot_read(ocelot, ANA_TABLES_VLANACCESS);
}
static inline int ocelot_vlant_wait_for_completion(struct ocelot *ocelot)
{
unsigned int val, timeout = 10;
u32 val;
/* Wait for the issued vlan table command to be completed, or timeout.
* When the command read from ANA_TABLES_VLANACCESS is
* VLANACCESS_CMD_IDLE, the issued command completed successfully.
*/
do {
val = ocelot_read(ocelot, ANA_TABLES_VLANACCESS);
val &= ANA_TABLES_VLANACCESS_VLAN_TBL_CMD_M;
} while (val != ANA_TABLES_VLANACCESS_CMD_IDLE && timeout--);
if (!timeout)
return -ETIMEDOUT;
return 0;
return readx_poll_timeout(ocelot_vlant_read_vlanaccess,
ocelot,
val,
(val & ANA_TABLES_VLANACCESS_VLAN_TBL_CMD_M) ==
ANA_TABLES_VLANACCESS_CMD_IDLE,
TABLE_UPDATE_SLEEP_US, TABLE_UPDATE_TIMEOUT_US);
}
static int ocelot_vlant_set_mask(struct ocelot *ocelot, u16 vid, u32 mask)