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drivers: net: xgene: Poll link status via GPIO

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When 10GbE SFP+ module is not plugged in or cable is not connected,
the link status register does not report the proper state due
to floating signal. This patch checks the module present status via an
GPIO to determine whether to ignore the link status register and report
link down.

Signed-off-by: Quan Nguyen <qnguyen@apm.com>
Signed-off-by: Iyappan Subramanian <isubramanian@apm.com>
Tested-by: Fushen Chen <fchen@apm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Iyappan Subramanian 2016-08-12 22:05:44 -07:00 committed by David S. Miller
parent 3eb7cb9dc9
commit 27ecf87c8a
4 changed files with 23 additions and 0 deletions
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1
drivers/net/ethernet/apm/xgene/Kconfig
View File

@ -4,6 +4,7 @@ config NET_XGENE
depends on ARCH_XGENE || COMPILE_TEST
select PHYLIB
select MDIO_XGENE
select GPIOLIB
help
This is the Ethernet driver for the on-chip ethernet interface on the
APM X-Gene SoC.

15
drivers/net/ethernet/apm/xgene/xgene_enet_main.c
View File

@ -19,6 +19,7 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/gpio.h>
#include "xgene_enet_main.h"
#include "xgene_enet_hw.h"
#include "xgene_enet_sgmac.h"
@ -1320,6 +1321,18 @@ static int xgene_enet_check_phy_handle(struct xgene_enet_pdata *pdata)
return 0;
}
static void xgene_enet_gpiod_get(struct xgene_enet_pdata *pdata)
{
struct device *dev = &pdata->pdev->dev;
if (pdata->phy_mode != PHY_INTERFACE_MODE_XGMII)
return;
pdata->sfp_rdy = gpiod_get(dev, "rxlos", GPIOD_IN);
if (IS_ERR(pdata->sfp_rdy))
pdata->sfp_rdy = gpiod_get(dev, "sfp", GPIOD_IN);
}
static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
{
struct platform_device *pdev;
@ -1409,6 +1422,8 @@ static int xgene_enet_get_resources(struct xgene_enet_pdata *pdata)
if (ret)
return ret;
xgene_enet_gpiod_get(pdata);
pdata->clk = devm_clk_get(&pdev->dev, NULL);
if (IS_ERR(pdata->clk)) {
/* Firmware may have set up the clock already. */

1
drivers/net/ethernet/apm/xgene/xgene_enet_main.h
View File

@ -217,6 +217,7 @@ struct xgene_enet_pdata {
u8 tx_delay;
u8 rx_delay;
bool mdio_driver;
struct gpio_desc *sfp_rdy;
};
struct xgene_indirect_ctl {

6
drivers/net/ethernet/apm/xgene/xgene_enet_xgmac.c
View File

@ -18,6 +18,8 @@
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/of_gpio.h>
#include <linux/gpio.h>
#include "xgene_enet_main.h"
#include "xgene_enet_hw.h"
#include "xgene_enet_xgmac.h"
@ -399,10 +401,14 @@ static void xgene_enet_link_state(struct work_struct *work)
{
struct xgene_enet_pdata *pdata = container_of(to_delayed_work(work),
struct xgene_enet_pdata, link_work);
struct gpio_desc *sfp_rdy = pdata->sfp_rdy;
struct net_device *ndev = pdata->ndev;
u32 link_status, poll_interval;
link_status = xgene_enet_link_status(pdata);
if (link_status && !IS_ERR(sfp_rdy) && !gpiod_get_value(sfp_rdy))
link_status = 0;
if (link_status) {
if (!netif_carrier_ok(ndev)) {
netif_carrier_on(ndev);