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net: dsa: b53: prevent BRCM_HDR access on older devices

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Older switches don't implement BRCM_HDR register so we should avoid
reading or writing it.

Reviewed-by: Florian Fainelli <florian.fainelli@broadcom.com>
Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
Link: https://patch.msgid.link/20250614080000.1884236-11-noltari@gmail.com
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
This commit is contained in:
Álvaro Fernández Rojas 2025-06-14 09:59:56 +02:00 committed by Jakub Kicinski
parent 800728abd9
commit e17813968b
1 changed files with 5 additions and 0 deletions
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5
drivers/net/dsa/b53/b53_common.c
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@ -730,6 +730,11 @@ void b53_brcm_hdr_setup(struct dsa_switch *ds, int port)
hdr_ctl |= GC_FRM_MGMT_PORT_M;
b53_write8(dev, B53_MGMT_PAGE, B53_GLOBAL_CONFIG, hdr_ctl);
/* B53_BRCM_HDR not present on devices with legacy tags */
if (dev->tag_protocol == DSA_TAG_PROTO_BRCM_LEGACY ||
dev->tag_protocol == DSA_TAG_PROTO_BRCM_LEGACY_FCS)
return;
/* Enable Broadcom tags for IMP port */
b53_read8(dev, B53_MGMT_PAGE, B53_BRCM_HDR, &hdr_ctl);
if (tag_en)