[PATCH] net: stmmac: overwrite the dma_cap.addr64 according to HW design

[PATCH] net: stmmac: overwrite the dma_cap.addr64 according to HW design

[Joakim Zhang]

From: Fugang Duan <fugang.duan@nxp.com>

The current IP register MAC_HW_Feature1[ADDR64] only defines
32/40/64 bit width, but some SOCs support others like i.MX8MP
support 34 bits but it maps to 40 bits width in MAC_HW_Feature1[ADDR64].
So overwrite dma_cap.addr64 according to HW real design.

Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
---
 drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c   | 9 +--------
 drivers/net/ethernet/stmicro/stmmac/stmmac_main.c | 8 ++++++++
 include/linux/stmmac.h                            | 1 +
 3 files changed, 10 insertions(+), 8 deletions(-)

diff --git a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
index efef5476a577..223f69da7e95 100644
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac-imx.c
@@ -246,13 +246,7 @@ static int imx_dwmac_probe(struct platform_device *pdev)
 		goto err_parse_dt;
 	}
 
-	ret = dma_set_mask_and_coherent(&pdev->dev,
-					DMA_BIT_MASK(dwmac->ops->addr_width));
-	if (ret) {
-		dev_err(&pdev->dev, "DMA mask set failed\n");
-		goto err_dma_mask;
-	}
-
+	plat_dat->addr64 = dwmac->ops->addr_width;
 	plat_dat->init = imx_dwmac_init;
 	plat_dat->exit = imx_dwmac_exit;
 	plat_dat->fix_mac_speed = imx_dwmac_fix_speed;
@@ -272,7 +266,6 @@ static int imx_dwmac_probe(struct platform_device *pdev)
 err_dwmac_init:
 err_drv_probe:
 	imx_dwmac_exit(pdev, plat_dat->bsp_priv);
-err_dma_mask:
 err_parse_dt:
 err_match_data:
 	stmmac_remove_config_dt(pdev, plat_dat);
diff --git a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
index 03c6995d276a..5b1c12ff98c0 100644
--- a/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
+++ b/drivers/net/ethernet/stmicro/stmmac/stmmac_main.c
@@ -4975,6 +4975,14 @@ int stmmac_dvr_probe(struct device *device,
 		dev_info(priv->device, "SPH feature enabled\n");
 	}
 
+	/* The current IP register MAC_HW_Feature1[ADDR64] only define
+	 * 32/40/64 bit width, but some SOC support others like i.MX8MP
+	 * support 34 bits but it map to 40 bits width in MAC_HW_Feature1[ADDR64].
+	 * So overwrite dma_cap.addr64 according to HW real design.
+	 */
+	if (priv->plat->addr64)
+		priv->dma_cap.addr64 = priv->plat->addr64;
+
 	if (priv->dma_cap.addr64) {
 		ret = dma_set_mask_and_coherent(device,
 				DMA_BIT_MASK(priv->dma_cap.addr64));
diff --git a/include/linux/stmmac.h b/include/linux/stmmac.h
index 628e28903b8b..15ca6b4167cc 100644
--- a/include/linux/stmmac.h
+++ b/include/linux/stmmac.h
@@ -170,6 +170,7 @@ struct plat_stmmacenet_data {
 	int unicast_filter_entries;
 	int tx_fifo_size;
 	int rx_fifo_size;
+	u32 addr64;
 	u32 rx_queues_to_use;
 	u32 tx_queues_to_use;
 	u8 rx_sched_algorithm;
-- 
2.17.1

Re: [PATCH] net: stmmac: overwrite the dma_cap.addr64 according to HW design

[Jakub Kicinski]

On Thu,  3 Dec 2020 10:44:23 +0800 Joakim Zhang wrote:
> From: Fugang Duan <fugang.duan@nxp.com>
> 
> The current IP register MAC_HW_Feature1[ADDR64] only defines
> 32/40/64 bit width, but some SOCs support others like i.MX8MP
> support 34 bits but it maps to 40 bits width in MAC_HW_Feature1[ADDR64].
> So overwrite dma_cap.addr64 according to HW real design.
> 
> Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
> Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>

This is refactoring, not a fix, right?

RE: [PATCH] net: stmmac: overwrite the dma_cap.addr64 according to HW design

[Joakim Zhang]

> -----Original Message-----
> From: Jakub Kicinski <kuba@kernel.org>
> Sent: 2020年12月4日 2:42
> To: Joakim Zhang <qiangqing.zhang@nxp.com>
> Cc: peppe.cavallaro@st.com; alexandre.torgue@st.com;
> joabreu@synopsys.com; davem@davemloft.net; dl-linux-imx
> <linux-imx@nxp.com>; netdev@vger.kernel.org
> Subject: Re: [PATCH] net: stmmac: overwrite the dma_cap.addr64 according to
> HW design
> 
> On Thu,  3 Dec 2020 10:44:23 +0800 Joakim Zhang wrote:
> > From: Fugang Duan <fugang.duan@nxp.com>
> >
> > The current IP register MAC_HW_Feature1[ADDR64] only defines
> > 32/40/64 bit width, but some SOCs support others like i.MX8MP support
> > 34 bits but it maps to 40 bits width in MAC_HW_Feature1[ADDR64].
> > So overwrite dma_cap.addr64 according to HW real design.
> >
> > Signed-off-by: Fugang Duan <fugang.duan@nxp.com>
> > Signed-off-by: Joakim Zhang <qiangqing.zhang@nxp.com>
> 
> This is refactoring, not a fix, right?

Hi Jakub,

In theory, this is a bug fix, please let it into net repo if possible.

I will add all bug fix tag for patches, and send out a V2. Thanks a lot.

Best Regards,
Joakim Zhang