resetOn 12/14/23 2:31 PM, Claudiu wrote:
> From: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
>
> CSR.OPS bits specify the current operating mode and (according to
> documentation) they are updated when the operating mode change request
> is processed. Thus, check CSR.OPS before proceeding.
The manuals I have indeed say we need to check CSR.OPS... But we only
need to wait iff we transfer from the operation mode to the config mode...
> Fixes: 568b3ce7a8ef ("ravb: factor out register bit twiddling code")
> Fixes: 0184165b2f42 ("ravb: add sleep PM suspend/resume support")
> Fixes: 7e09a052dc4e ("ravb: Exclude gPTP feature support for RZ/G2L")
> Fixes: 3e3d647715d4 ("ravb: add wake-on-lan support via magic packet")
> Fixes: c156633f1353 ("Renesas Ethernet AVB driver proper")
Hm, that long list does look weird...
> Signed-off-by: Claudiu Beznea <claudiu.beznea.uj@xxxxxxxxxxxxxx>
> ---
> drivers/net/ethernet/renesas/ravb_main.c | 47 ++++++++++++++++++++----
> 1 file changed, 39 insertions(+), 8 deletions(-)
>
> diff --git a/drivers/net/ethernet/renesas/ravb_main.c b/drivers/net/ethernet/renesas/ravb_main.c
> index 9178f6d60e74..ce95eb5af354 100644
> --- a/drivers/net/ethernet/renesas/ravb_main.c
> +++ b/drivers/net/ethernet/renesas/ravb_main.c
> @@ -683,8 +683,11 @@ static int ravb_dmac_init(struct net_device *ndev)
>
> /* Setting the control will start the AVB-DMAC process. */
> ravb_modify(ndev, CCC, CCC_OPC, CCC_OPC_OPERATION);
> + error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_OPERATION);
> + if (error)
> + netdev_err(ndev, "failed to switch device to operation mode\n");
It doesn't look like ravb_wait() is needed here...
And besides, this pattern seems repetitive and worth factoring out into
a single function.
[...]
> @@ -1744,6 +1747,18 @@ static inline int ravb_hook_irq(unsigned int irq, irq_handler_t handler,
> return error;
> }
>
> +static int ravb_set_reset_mode(struct net_device *ndev)
> +{
> + int error;
> +
> + ravb_write(ndev, CCC_OPC_RESET, CCC);
> + error = ravb_wait(ndev, CSR, CSR_OPS, CSR_OPS_RESET);
> + if (error)
> + netdev_err(ndev, "failed to switch device to reset mode\n");
> +
> + return error;
> +}
> +
Again, ravb_wait() call doesn't seem necessary here...
[...]
MBR, Sergey
