[PATCH net-next v1 1/1] net: stmmac: xgmac: Enable support for multiple Flexible PPS outputs

[PATCH net-next v1 1/1] net: stmmac: xgmac: Enable support for multiple Flexible PPS outputs

[Furong Xu]

From XGMAC Core 3.20 and later, each Flexible PPS has individual PPSEN bit
to select Fixed mode or Flexible mode. The PPSEN must be set, or it stays
in Fixed PPS mode by default.
XGMAC Core prior 3.20, corresponding PPSEN bits are read-only reserved,
always set PPSEN do not make things worse ;)

Signed-off-by: Furong Xu <0x1207@gmail.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h      | 2 +-
 drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 2 +-
 2 files changed, 2 insertions(+), 2 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
index 7a8f47e7b728..a4e8b498dea9 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
@@ -259,7 +259,7 @@
 	((val) << XGMAC_PPS_MINIDX(x))
 #define XGMAC_PPSCMD_START		0x2
 #define XGMAC_PPSCMD_STOP		0x5
-#define XGMAC_PPSEN0			BIT(4)
+#define XGMAC_PPSENx(x)			BIT(4 + (x) * 8)
 #define XGMAC_PPSx_TARGET_TIME_SEC(x)	(0x00000d80 + (x) * 0x10)
 #define XGMAC_PPSx_TARGET_TIME_NSEC(x)	(0x00000d84 + (x) * 0x10)
 #define XGMAC_TRGTBUSY0			BIT(31)
diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
index f352be269deb..53bb8f16c481 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
@@ -1178,7 +1178,7 @@ static int dwxgmac2_flex_pps_config(void __iomem *ioaddr, int index,
 
 	val |= XGMAC_PPSCMDx(index, XGMAC_PPSCMD_START);
 	val |= XGMAC_TRGTMODSELx(index, XGMAC_PPSCMD_START);
-	val |= XGMAC_PPSEN0;
+	val |= XGMAC_PPSENx(index);
 
 	writel(cfg->start.tv_sec, ioaddr + XGMAC_PPSx_TARGET_TIME_SEC(index));
 
-- 
2.34.1

Re: [PATCH net-next v1 1/1] net: stmmac: xgmac: Enable support for multiple Flexible PPS outputs

[Jacob Keller]

On 10/26/2023 2:48 AM, Furong Xu wrote:
> From XGMAC Core 3.20 and later, each Flexible PPS has individual PPSEN bit
> to select Fixed mode or Flexible mode. The PPSEN must be set, or it stays
> in Fixed PPS mode by default.
> XGMAC Core prior 3.20, corresponding PPSEN bits are read-only reserved,
> always set PPSEN do not make things worse ;)
> 

Previous revisions the corresponding bits are always set, and don't get
modified by writes, so setting these bits for all hardware has no ill
effect.

In the previous code we always set BIT(4), but nwo we set BIT(4+x). This
won't affect XGMAC prior to 3.20, but corrects a mistake when
programming the newer XGMAC. Ok.

Reviewed-by: Jacob Keller <jacob.e.keller@intel.com>

The original code was added in 95eaf3cd0a90 ("net: stmmac: dwxgmac: Add
Flexible PPS support"), which landed in v5.4

It looks like XGMAC Core 3.20 support was not added until possibly
commit 669a55560e4b ("net: stmmac: Check more MAC HW features for XGMAC
Core 3.20") which appears to be new enough that its not in any official
Linux release, though it looks like it was already in net.

Perhaps this should be tagged Fixes: and sent through net, hopefully to
try and hit 6.6 or at least a stable release shortly after?

Thanks,
Jake

Re: [PATCH net-next v1 1/1] net: stmmac: xgmac: Enable support for multiple Flexible PPS outputs

[Serge Semin]

On Thu, Oct 26, 2023 at 05:48:56PM +0800, Furong Xu wrote:
> From XGMAC Core 3.20 and later, each Flexible PPS has individual PPSEN bit
> to select Fixed mode or Flexible mode. The PPSEN must be set, or it stays
> in Fixed PPS mode by default.

Are you sure 3.10a don't have the PPSEN flag available for all
outputs too?

> XGMAC Core prior 3.20, corresponding PPSEN bits are read-only reserved,
> always set PPSEN do not make things worse ;)
> 
> Signed-off-by: Furong Xu <0x1207@gmail.com>
> ---
>  drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h      | 2 +-
>  drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c | 2 +-
>  2 files changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> index 7a8f47e7b728..a4e8b498dea9 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2.h
> @@ -259,7 +259,7 @@
>  	((val) << XGMAC_PPS_MINIDX(x))
>  #define XGMAC_PPSCMD_START		0x2
>  #define XGMAC_PPSCMD_STOP		0x5
> -#define XGMAC_PPSEN0			BIT(4)
> +#define XGMAC_PPSENx(x)			BIT(4 + (x) * 8)
>  #define XGMAC_PPSx_TARGET_TIME_SEC(x)	(0x00000d80 + (x) * 0x10)
>  #define XGMAC_PPSx_TARGET_TIME_NSEC(x)	(0x00000d84 + (x) * 0x10)
>  #define XGMAC_TRGTBUSY0			BIT(31)
> diff --git a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
> index f352be269deb..53bb8f16c481 100644
> --- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
> +++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_core.c
> @@ -1178,7 +1178,7 @@ static int dwxgmac2_flex_pps_config(void __iomem *ioaddr, int index,
>  
>  	val |= XGMAC_PPSCMDx(index, XGMAC_PPSCMD_START);
>  	val |= XGMAC_TRGTMODSELx(index, XGMAC_PPSCMD_START);
> -	val |= XGMAC_PPSEN0;

> +	val |= XGMAC_PPSENx(index);

At the very least it would be nice to have a comment here that the
mode selection was available for the output #0 only in the IP-cores
prior v3.20a with the outputs 1-3 always working as flexible PPS
outputs.

Other than that no more comments:
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>

-Serge(y)

>  
>  	writel(cfg->start.tv_sec, ioaddr + XGMAC_PPSx_TARGET_TIME_SEC(index));
>  
> -- 
> 2.34.1
> 
>