[PATCH 5.10 074/103] net: stmmac: fix get_hw_feature() on old hardware

Greg Kroah-Hartman
2021-10-18T13:45:23Z

From: Herve Codina <herve.codina@bootlin.com>

commit 075da584bae2da6a37428d59a477b6bdad430ac3 upstream.

Some old IPs do not provide the hardware feature register.
On these IPs, this register is read 0x00000000.

In old driver version, this feature was handled but a regression came
with the commit f10a6a3541b4 ("stmmac: rework get_hw_feature function").
Indeed, this commit removes the return value in dma->get_hw_feature().
This return value was used to indicate the validity of retrieved
information and used later on in stmmac_hw_init() to override
priv->plat data if this hardware feature were valid.

This patch restores the return code in ->get_hw_feature() in order
to indicate the hardware feature validity and override priv->plat
data only if this hardware feature is valid.

Fixes: f10a6a3541b4 ("stmmac: rework get_hw_feature function")
Signed-off-by: Herve Codina <herve.codina@bootlin.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c | 13 +++++++++++--
drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c | 6 ++++--
drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c | 6 ++++--
drivers/net/ethernet/stmicro/stmmac/hwif.h | 6 +++---
4 files changed, 22 insertions(+), 9 deletions(-)

--- a/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac1000_dma.c
@@ -218,11 +218,18 @@ static void dwmac1000_dump_dma_regs(void
readl(ioaddr + DMA_BUS_MODE + i * 4);
}

-static void dwmac1000_get_hw_feature(void __iomem *ioaddr,
- struct dma_features *dma_cap)
+static int dwmac1000_get_hw_feature(void __iomem *ioaddr,
+ struct dma_features *dma_cap)
{
u32 hw_cap = readl(ioaddr + DMA_HW_FEATURE);

+ if (!hw_cap) {
+ /* 0x00000000 is the value read on old hardware that does not
+ * implement this register
+ */
+ return -EOPNOTSUPP;
+ }
+
dma_cap->mbps_10_100 = (hw_cap & DMA_HW_FEAT_MIISEL);
dma_cap->mbps_1000 = (hw_cap & DMA_HW_FEAT_GMIISEL) >> 1;
dma_cap->half_duplex = (hw_cap & DMA_HW_FEAT_HDSEL) >> 2;
@@ -252,6 +259,8 @@ static void dwmac1000_get_hw_feature(voi
dma_cap->number_tx_channel = (hw_cap & DMA_HW_FEAT_TXCHCNT) >> 22;
/* Alternate (enhanced) DESC mode */
dma_cap->enh_desc = (hw_cap & DMA_HW_FEAT_ENHDESSEL) >> 24;
+
+ return 0;
}

static void dwmac1000_rx_watchdog(void __iomem *ioaddr, u32 riwt,
--- a/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwmac4_dma.c
@@ -337,8 +337,8 @@ static void dwmac4_dma_tx_chan_op_mode(v
writel(mtl_tx_op, ioaddr + MTL_CHAN_TX_OP_MODE(channel));
}

-static void dwmac4_get_hw_feature(void __iomem *ioaddr,
- struct dma_features *dma_cap)
+static int dwmac4_get_hw_feature(void __iomem *ioaddr,
+ struct dma_features *dma_cap)
{
u32 hw_cap = readl(ioaddr + GMAC_HW_FEATURE0);

@@ -425,6 +425,8 @@ static void dwmac4_get_hw_feature(void _
dma_cap->frpbs = (hw_cap & GMAC_HW_FEAT_FRPBS) >> 11;
dma_cap->frpsel = (hw_cap & GMAC_HW_FEAT_FRPSEL) >> 10;
dma_cap->dvlan = (hw_cap & GMAC_HW_FEAT_DVLAN) >> 5;
+
+ return 0;
}

/* Enable/disable TSO feature and set MSS */
--- a/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
+++ b/drivers/net/ethernet/stmicro/stmmac/dwxgmac2_dma.c
@@ -365,8 +365,8 @@ static int dwxgmac2_dma_interrupt(void _
return ret;
}

-static void dwxgmac2_get_hw_feature(void __iomem *ioaddr,
- struct dma_features *dma_cap)
+static int dwxgmac2_get_hw_feature(void __iomem *ioaddr,
+ struct dma_features *dma_cap)
{
u32 hw_cap;

@@ -439,6 +439,8 @@ static void dwxgmac2_get_hw_feature(void
dma_cap->frpes = (hw_cap & XGMAC_HWFEAT_FRPES) >> 11;
dma_cap->frpbs = (hw_cap & XGMAC_HWFEAT_FRPPB) >> 9;
dma_cap->frpsel = (hw_cap & XGMAC_HWFEAT_FRPSEL) >> 3;
+
+ return 0;
}

static void dwxgmac2_rx_watchdog(void __iomem *ioaddr, u32 riwt, u32 nchan)
--- a/drivers/net/ethernet/stmicro/stmmac/hwif.h
+++ b/drivers/net/ethernet/stmicro/stmmac/hwif.h
@@ -203,8 +203,8 @@ struct stmmac_dma_ops {
int (*dma_interrupt) (void __iomem *ioaddr,
struct stmmac_extra_stats *x, u32 chan);
/* If supported then get the optional core features */
- void (*get_hw_feature)(void __iomem *ioaddr,
- struct dma_features *dma_cap);
+ int (*get_hw_feature)(void __iomem *ioaddr,
+ struct dma_features *dma_cap);
/* Program the HW RX Watchdog */
void (*rx_watchdog)(void __iomem *ioaddr, u32 riwt, u32 number_chan);
void (*set_tx_ring_len)(void __iomem *ioaddr, u32 len, u32 chan);
@@ -255,7 +255,7 @@ struct stmmac_dma_ops {
#define stmmac_dma_interrupt_status(__priv, __args...) \
stmmac_do_callback(__priv, dma, dma_interrupt, __args)
#define stmmac_get_hw_feature(__priv, __args...) \
- stmmac_do_void_callback(__priv, dma, get_hw_feature, __args)
+ stmmac_do_callback(__priv, dma, get_hw_feature, __args)
#define stmmac_rx_watchdog(__priv, __args...) \
stmmac_do_void_callback(__priv, dma, rx_watchdog, __args)
#define stmmac_set_tx_ring_len(__priv, __args...) \