@@ -767,7 +767,8 @@ static int rtl8365mb_ext_config_rgmii(struct realtek_smi *smi, int port,
* 0 = no delay, 1 = 2 ns delay
* RX delay:
* 0 = no delay, 7 = maximum delay
- * No units are specified, but there are a total of 8 steps.
+ * Each step is approximately 0.3 ns, so the maximum delay is about
+ * 2.1 ns.
*
* The vendor driver also states that this must be configured *before*
* forcing the external interface into a particular mode, which is done
@@ -778,10 +779,6 @@ static int rtl8365mb_ext_config_rgmii(struct realtek_smi *smi, int port,
* specified. We ignore the detail of the RGMII interface mode
* (RGMII_{RXID, TXID, etc.}), as this is considered to be a PHY-only
* property.
- *
- * For the RX delay, we assume that a register value of 4 corresponds to
- * 2 ns. But this is just an educated guess, so ignore all other values
- * to avoid too much confusion.
*/
if (!of_property_read_u32(dn, "tx-internal-delay-ps", &val)) {
val = val / 1000; /* convert to ns */
@@ -794,13 +791,13 @@ static int rtl8365mb_ext_config_rgmii(struct realtek_smi *smi, int port,
}
if (!of_property_read_u32(dn, "rx-internal-delay-ps", &val)) {
- val = val / 1000; /* convert to ns */
+ val = DIV_ROUND_CLOSEST(val, 300); /* convert to 0.3 ns step */
- if (val == 0 || val == 2)
- rx_delay = val * 2;
+ if (val <= 7)
+ rx_delay = val;
else
dev_warn(smi->dev,
- "EXT port RX delay must be 0 to 2 ns\n");
+ "EXT port RX delay must be 0 to 2.1 ns\n");
}
ret = regmap_update_bits(