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drivers/net/airoha_eth: enable hw padding of short tx packets

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Transmission of short packets does not work good for XFI (GDM2) and
HSGMII (GDM3) interfaces. The issue can be solved with:

 - padding of short packets to 60 bytes
 - setting of PAD_EN bit in the corresponding REG_GDM_FWD_CFG(n)
   register.

The issue should present for the lan switch (GDM1) as well, but it does
does not appear due to unknown reason.

This patch set PAD_EN bit for the used GDM.

Signed-off-by: Mikhail Kshevetskiy <mikhail.kshevetskiy@iopsys.eu>
This commit is contained in:
Mikhail Kshevetskiy 2025-07-09 12:28:10 +03:00 committed by Tom Rini
parent 997786bbf4
commit 0e59a2ca9d
1 changed files with 11 additions and 2 deletions
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13
drivers/net/airoha_eth.c
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@ -97,6 +97,7 @@
(_n) == 2 ? GDM2_BASE : GDM1_BASE)
#define REG_GDM_FWD_CFG(_n) GDM_BASE(_n)
#define GDM_PAD_EN BIT(28)
#define GDM_DROP_CRC_ERR BIT(23)
#define GDM_IP4_CKSUM BIT(22)
#define GDM_TCP_CKSUM BIT(21)
@ -380,8 +381,11 @@ static void airoha_fe_maccr_init(struct airoha_eth *eth)
int p;
for (p = 1; p <= ARRAY_SIZE(eth->ports); p++) {
/* Disable any kind of CRC drop or offload */
airoha_fe_wr(eth, REG_GDM_FWD_CFG(p), 0);
/*
* Disable any kind of CRC drop or offload.
* Enable padding of short TX packets to 60 bytes.
*/
airoha_fe_wr(eth, REG_GDM_FWD_CFG(p), GDM_PAD_EN);
}
}
@ -830,6 +834,11 @@ static int airoha_eth_send(struct udevice *dev, void *packet, int length)
u32 val;
int i;
/*
* There is no need to pad short TX packets to 60 bytes since the
* GDM_PAD_EN bit set in the corresponding REG_GDM_FWD_CFG(n) register.
*/
dma_addr = dma_map_single(packet, length, DMA_TO_DEVICE);
qid = 0;