From 64dd9d000e369761e2da9d7b53e60c3296bd1890 Mon Sep 17 00:00:00 2001 From: Subrata Banik Date: Tue, 6 Dec 2022 13:55:01 +0530 Subject: soc/intel/meteorlake: Skip duplicate PCIe RP CLKSRC programming When an enabled root port without pcie_rp clock being specified, the empty structure provides invalid info, which indicates '0' is the clock source and request. If a root port does not use clock source, it should still need to provide pcie_rp clock structure with flags set to PCIE_RP_CLK_SRC_UNUSED. If flags, clk_src, and clk_req are all '0', it is considered that pcie_rp clock structure is not provided for that root port. Add check and skip PCIe CLKSRC programming without a clock structure. In addition, a root port can not use a free running clock or clock set to LAN. Note that ClockUsage is either free running clock, LAN clock, or the root port number which consumes the clock. This patch is backported from commit edf71a08b4cb7bd8683344aa4ad301f1526289c2 (soc/intel/alderlake: Skip PCIe source clock assignment if incorrect) Change-Id: Ie9179880a57796d8595874325203280590d7ee9d Signed-off-by: Subrata Banik Reviewed-on: https://review.coreboot.org/c/coreboot/+/70415 Reviewed-by: Kapil Porwal Reviewed-by: Ivy Jian Reviewed-by: Eric Lai Tested-by: build bot (Jenkins) --- src/soc/intel/meteorlake/romstage/fsp_params.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/src/soc/intel/meteorlake/romstage/fsp_params.c b/src/soc/intel/meteorlake/romstage/fsp_params.c index 89f6aaf191..7453eb0222 100644 --- a/src/soc/intel/meteorlake/romstage/fsp_params.c +++ b/src/soc/intel/meteorlake/romstage/fsp_params.c @@ -35,9 +35,10 @@ static void pcie_rp_init(FSP_M_CONFIG *m_cfg, uint32_t en_mask, continue; if (cfg[i].flags & PCIE_RP_CLK_SRC_UNUSED) continue; - /* flags 0 means, RP config is not specify from devicetree */ - if (cfg[i].flags == 0) + if (!cfg[i].flags && cfg[i].clk_src == 0 && cfg[i].clk_req == 0) { + printk(BIOS_WARNING, "Missing root port clock structure definition\n"); continue; + } if (clk_req_mapping & (1 << cfg[i].clk_req)) printk(BIOS_WARNING, "Found overlapped clkreq assignment on clk req %d\n" , cfg[i].clk_req); -- cgit v1.2.3