diff options
| -rw-r--r-- | drivers/cxl/mem.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/cxl/mem.c b/drivers/cxl/mem.c index 3baae1332760..43e73d259207 100644 --- a/drivers/cxl/mem.c +++ b/drivers/cxl/mem.c @@ -107,11 +107,17 @@ __mock bool cxl_hdm_decode_init(struct cxl_dev_state *cxlds) global_ctrl = readl(crb + cmap->hdm_decoder.offset + CXL_HDM_DECODER_CTRL_OFFSET); global_enable = global_ctrl & CXL_HDM_DECODER_ENABLE; - if (!global_enable && info->ranges) { - dev_dbg(cxlds->dev, - "DVSEC ranges already programmed and HDM decoders not enabled.\n"); + + /* + * Per CXL 2.0 Section 8.1.3.8.3 and 8.1.3.8.4 DVSEC CXL Range 1 Base + * [High,Low] when HDM operation is enabled the range register values + * are ignored by the device, but the spec also recommends matching the + * DVSEC Range 1,2 to HDM Decoder Range 0,1. So, non-zero info->ranges + * are expected even though Linux does not require or maintain that + * match. + */ + if (!global_enable && info->ranges) goto out; - } retval = true; |