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| author | LuluTHSu <Lulu_Su@wistron.com> | 2020-10-30 10:22:29 +0800 |
|---|---|---|
| committer | Oliver O'Halloran <oohall@gmail.com> | 2020-11-02 12:37:01 +1100 |
| commit | 5262cdd1b99f77bca5951fc8132f9795ef0c2b87 (patch) | |
| tree | 440a2ae6803e3b5cf22d0b62616e31927f8c3fd3 | |
| parent | 233ade2f6ffdfa406100276784eb447d062fe8e7 (diff) | |
| download | skiboot-5262cdd1b99f77bca5951fc8132f9795ef0c2b87.zip skiboot-5262cdd1b99f77bca5951fc8132f9795ef0c2b87.tar.gz skiboot-5262cdd1b99f77bca5951fc8132f9795ef0c2b87.tar.bz2 | |
mowgli: Limit slot1 to Gen3 by default
Refer to the spec. of mowgli, limit the slot to Gen3 speed.
For mowgli platform spec.
Cc: skiboot-stable@lists.ozlabs.org
Signed-off-by: LuluTHSu <Lulu_Su@wistron.com>
Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
| -rw-r--r-- | hw/phb4.c | 21 | ||||
| -rw-r--r-- | include/phb4.h | 1 | ||||
| -rw-r--r-- | platforms/astbmc/mowgli.c | 16 |
3 files changed, 38 insertions, 0 deletions
@@ -2991,6 +2991,27 @@ static unsigned int phb4_get_max_link_speed(struct phb4 *p, struct dt_node *np) return max_link_speed; } +/* + * Has the same effect as the ibm,max-link-speed property. + * i.e. sets the default link speed, while allowing NVRAM + * overrides, etc to still take effect. + */ +void phb4_set_dt_max_link_speed(struct phb4 *p, int new_max) +{ + uint64_t scr; + int max; + + /* take into account nvram settings, etc */ + if (pcie_max_link_speed) + max = pcie_max_link_speed; + else + max = new_max; + + scr = phb4_read_reg(p, PHB_PCIE_SCR); + scr = SETFIELD(PHB_PCIE_SCR_MAXLINKSPEED, scr, max); + phb4_write_reg(p, PHB_PCIE_SCR, scr); +} + static void phb4_assert_perst(struct pci_slot *slot, bool assert) { struct phb4 *p = phb_to_phb4(slot->phb); diff --git a/include/phb4.h b/include/phb4.h index abba2d9..47a46b7 100644 --- a/include/phb4.h +++ b/include/phb4.h @@ -259,4 +259,5 @@ static inline int phb4_get_opal_id(unsigned int chip_id, unsigned int index) void phb4_pec2_dma_engine_realloc(struct phb4 *p); +void phb4_set_dt_max_link_speed(struct phb4 *p, int new_max); #endif /* __PHB4_H */ diff --git a/platforms/astbmc/mowgli.c b/platforms/astbmc/mowgli.c index 9bfe7a4..0246bff 100644 --- a/platforms/astbmc/mowgli.c +++ b/platforms/astbmc/mowgli.c @@ -12,6 +12,8 @@ #include <psi.h> #include <npu-regs.h> #include <secvar.h> +#include <pci.h> +#include <phb4.h> #include "astbmc.h" @@ -71,6 +73,19 @@ static int mowgli_secvar_init(void) return secvar_main(secboot_tpm_driver, edk2_compatible_v1); } +/* + * Limit PHB0/(pec0) to gen3 speeds. + */ +static void mowgli_setup_phb(struct phb *phb, unsigned int __unused index) +{ + struct phb4 *p = phb_to_phb4(phb); + + if (p->pec == 0) { + phb4_set_dt_max_link_speed(p, 3); + prlog(PR_DEBUG, "Mowgli: Force the PHB%d Speed to Gen3.\n", p->pec); + } +} + DECLARE_PLATFORM(mowgli) = { .name = "Mowgli", .probe = mowgli_probe, @@ -80,6 +95,7 @@ DECLARE_PLATFORM(mowgli) = { .bmc = &bmc_plat_ast2500_openbmc, .pci_get_slot_info = slot_table_get_slot_info, .pci_probe_complete = check_all_slot_table, + .pci_setup_phb = mowgli_setup_phb, .cec_power_down = astbmc_ipmi_power_down, .cec_reboot = astbmc_ipmi_reboot, .elog_commit = ipmi_elog_commit, |