diff options
| -rw-r--r-- | core/init.c | 17 | ||||
| -rw-r--r-- | hw/phb3.c | 17 | ||||
| -rw-r--r-- | hw/phb4.c | 17 | ||||
| -rw-r--r-- | include/skiboot.h | 2 |
4 files changed, 47 insertions, 6 deletions
diff --git a/core/init.c b/core/init.c index 983ead5d..d9d62ee9 100644 --- a/core/init.c +++ b/core/init.c @@ -49,6 +49,7 @@ #include <libstb/container.h> enum proc_gen proc_gen; +unsigned int pcie_max_link_speed; static uint64_t kernel_entry; static size_t kernel_size; @@ -700,6 +701,20 @@ static void per_thread_sanity_checks(void) assert(cpu->state != cpu_state_no_cpu); } +static void pci_nvram_init(void) +{ + const char *nvram_speed; + + pcie_max_link_speed = 0; + + nvram_speed = nvram_query("pcie-max-link-speed"); + if (nvram_speed) { + pcie_max_link_speed = atoi(nvram_speed); + prlog(PR_NOTICE, "PHB: NVRAM set max link speed to GEN%i\n", + pcie_max_link_speed); + } +} + /* Called from head.S, thus no prototype. */ void main_cpu_entry(const void *fdt); @@ -917,6 +932,8 @@ void __noreturn __nomcount main_cpu_entry(const void *fdt) op_display(OP_LOG, OP_MOD_INIT, 0x0002); + pci_nvram_init(); + phb3_preload_vpd(); phb3_preload_capp_ucode(); start_preload_kernel(); @@ -4671,7 +4671,6 @@ static void phb3_create(struct dt_node *np) p->phb.ops = &phb3_ops; p->phb.phb_type = phb_type_pcie_v3; p->phb.scan_map = 0x1; /* Only device 0 to scan */ - p->max_link_speed = dt_prop_get_u32_def(np, "ibm,max-link-speed", 3); p->state = PHB3_STATE_UNINITIALIZED; if (!phb3_calculate_windows(p)) @@ -4737,6 +4736,16 @@ static void phb3_create(struct dt_node *np) if (!p->phb.base_loc_code) PHBERR(p, "Base location code not found !\n"); + /* Priority order: NVRAM -> dt -> GEN3 */ + p->max_link_speed = 3; + if (dt_has_node_property(np, "ibm,max-link-speed", NULL)) + p->max_link_speed = dt_prop_get_u32(np, "ibm,max-link-speed"); + if (pcie_max_link_speed) + p->max_link_speed = pcie_max_link_speed; + if (p->max_link_speed > 3) /* clamp to 3 */ + p->max_link_speed = 3; + PHBINF(p, "Max link speed: GEN%i\n", p->max_link_speed); + /* Check for lane equalization values from HB or HDAT */ p->lane_eq = dt_prop_get_def_size(np, "ibm,lane-eq", NULL, &lane_eq_len); if (p->lane_eq && lane_eq_len != (8 * 4)) { @@ -4966,8 +4975,10 @@ static void phb3_probe_pbcq(struct dt_node *pbcq) capp_ucode_base = dt_prop_get_u32(pbcq, "ibm,capp-ucode"); dt_add_property_cells(np, "ibm,capp-ucode", capp_ucode_base); } - max_link_speed = dt_prop_get_u32_def(pbcq, "ibm,max-link-speed", 3); - dt_add_property_cells(np, "ibm,max-link-speed", max_link_speed); + if (dt_has_node_property(pbcq, "ibm,max-link-speed", NULL)) { + max_link_speed = dt_prop_get_u32(pbcq, "ibm,max-link-speed"); + dt_add_property_cells(np, "ibm,max-link-speed", max_link_speed); + } dt_add_property_cells(np, "ibm,capi-flags", OPAL_PHB_CAPI_FLAG_SNOOP_CONTROL); @@ -3092,7 +3092,6 @@ static void phb4_create(struct dt_node *np) p->phb.ops = &phb4_ops; p->phb.phb_type = phb_type_pcie_v4; p->phb.scan_map = 0x1; /* Only device 0 to scan */ - p->max_link_speed = dt_prop_get_u32_def(np, "ibm,max-link-speed", 4); p->state = PHB4_STATE_UNINITIALIZED; if (!phb4_calculate_windows(p)) @@ -3169,6 +3168,16 @@ static void phb4_create(struct dt_node *np) if (!phb4_read_capabilities(p)) goto failed; + /* Priority order: NVRAM -> dt -> GEN4 */ + p->max_link_speed = 4; + if (dt_has_node_property(np, "ibm,max-link-speed", NULL)) + p->max_link_speed = dt_prop_get_u32(np, "ibm,max-link-speed"); + if (pcie_max_link_speed) + p->max_link_speed = pcie_max_link_speed; + if (p->max_link_speed > 4) /* clamp to 4 */ + p->max_link_speed = 4; + PHBINF(p, "Max link speed: GEN%i\n", p->max_link_speed); + /* Check for lane equalization values from HB or HDAT */ p->lane_eq = dt_prop_get_def_size(np, "ibm,lane-eq", NULL, &lane_eq_len); if (p->lane_eq) { @@ -3446,8 +3455,10 @@ static void phb4_probe_stack(struct dt_node *stk_node, uint32_t pec_index, capp_ucode_base = dt_prop_get_u32(stk_node, "ibm,capp-ucode"); dt_add_property_cells(np, "ibm,capp-ucode", capp_ucode_base); } - max_link_speed = dt_prop_get_u32_def(stk_node, "ibm,max-link-speed", 4); - dt_add_property_cells(np, "ibm,max-link-speed", max_link_speed); + if (dt_has_node_property(stk_node, "ibm,max-link-speed", NULL)) { + max_link_speed = dt_prop_get_u32(stk_node, "ibm,max-link-speed"); + dt_add_property_cells(np, "ibm,max-link-speed", max_link_speed); + } dt_add_property_cells(np, "ibm,capi-flags", OPAL_PHB_CAPI_FLAG_SNOOP_CONTROL); diff --git a/include/skiboot.h b/include/skiboot.h index bb0a7b53..c55995b7 100644 --- a/include/skiboot.h +++ b/include/skiboot.h @@ -132,6 +132,8 @@ enum proc_gen { }; extern enum proc_gen proc_gen; +extern unsigned int pcie_max_link_speed; + /* Convert a 4-bit number to a hex char */ extern char __attrconst tohex(uint8_t nibble); |
