On 06/05/2015 05:43 PM, Florian Fainelli wrote: > On 05/06/15 15:40, Jaeden Amero wrote: >> Link failures have been observed when using the KSZ9031 with HP 1810-8G >> and HP 1910-8G network switches. Center the FLP timing at 16ms to help >> avoid intermittent link failures. >> >> From the KSZ9031RNX and KSZ9031MNX data sheets revision 2.2, section >> "Auto-Negotiation Timing": >> The KSZ9031[RNX or MNX] Fast Link Pulse (FLP) burst-to-burst >> transmit timing for Auto-Negotiation defaults to 8ms. IEEE 802.3 >> Standard specifies this timing to be 16ms +/-8ms. Some PHY link >> partners need to receive the FLP with 16ms centered timing; >> otherwise, there can be intermittent link failures and long >> link-up times. >> >> After KSZ9031[RNX or MNX] power-up/reset, program the following >> register sequence to set the FLP timing to 16ms >> >> Write Register Dh = 0x0000 // Set up register address for MMD – Device >> Address 0h >> Write Register Eh = 0x0004 // Select Register 4h of MMD – Device >> Address 0h >> Write Register Dh = 0x4000 // Select register data for MMD – Device >> Address 0h, Register 4h >> Write Register Eh = 0x0006 // Write value 0x0006 to MMD – Device >> Address 0h, Register 4h >> Write Register Dh = 0x0000 // Set up register address for MMD – Device >> Address 0h >> Write Register Eh = 0x0003 // Select Register 3h of MMD – Device >> Address 0h >> Write Register Dh = 0x4000 // Select register data for MMD – Device >> Address 0h, Register 3h >> Write Register Eh = 0x1A80 // Write value 0x1A80 to MMD – Device >> Address 0h, Register 3h >> Write Register 0h, Bit [9] = 1 // Restart Auto-Negotiation > > Quoting a portion of the data-sheet on how to do this programming is > very strange considering that the code is going to be the reference, not > the commit message.
I included it for lack of something better to quote that explained which values to set when. I'd be happy to revise the message as this appears too strange. > Other than that, this looks reasonable. Thanks very much for the review. Cheers, Jaeden -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
