Hi Balbi, >> +/* >> + * This function is used to configure the PHY to operation as either SATA >> Gen1 >> + * or Gen2 speed. >> + */ >> +static void xgene_phy_sata_force_gen(struct xgene_phy_ctx *ctx, >> + int lane, int gen) > > why do you need to *force* the generation ? Is this because of some > silicon errata ? It almost seems like this should be done through link > negotiation between both link partners.
You can call this as an errata or limitation of the underlying PHY IP. As start, the PHY is configured with auto neg up to 6Gbps (or Gen3 speed). After link up, we will know whether it is Gen1 (1.5Gbps), Gen2 (3.0Gbps), or Gen3 (6.0Gbps). In order to ensure reliability, the PHY needs to be configured at specified speed. For this reason and after link up, the PHY is re-trained for the linked up speed. -Loc -- 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/
