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| author | Zhao Qiang <B45475@freescale.com> | 2015-03-26 16:13:09 +0800 |
|---|---|---|
| committer | York Sun <yorksun@freescale.com> | 2015-05-04 09:24:16 -0700 |
| commit | 5066e62847bddf6030262ade2aa3e7bcdc930037 (patch) | |
| tree | 92d5aa42673b6b529453f3cec05fb8799bf9b039 /drivers/pci/fsl_pci_init.c | |
| parent | 373762c34cd33b4a445b758090daaa87ccfa3fc6 (diff) | |
| download | u-boot-imx-5066e62847bddf6030262ade2aa3e7bcdc930037.zip u-boot-imx-5066e62847bddf6030262ade2aa3e7bcdc930037.tar.gz u-boot-imx-5066e62847bddf6030262ade2aa3e7bcdc930037.tar.bz2 | |
T2080QDS/PCIe: Soft Reset PCIe on T2080QDS for down-training issue
T2080QDS PEX1/Slot#1 will down-train from x4 to x2,
with SRDS_PRTCL_S1 = 0x66 and SRDS_PRTCL_S2 = 0x15.
Soft reset PCIe can fix this issue.
Signed-off-by: Zhao Qiang <B45475@freescale.com>
Reviewed-by: York Sun <yorksun@freescale.com>
Diffstat (limited to 'drivers/pci/fsl_pci_init.c')
| -rw-r--r-- | drivers/pci/fsl_pci_init.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/drivers/pci/fsl_pci_init.c b/drivers/pci/fsl_pci_init.c index 231b075..152045e 100644 --- a/drivers/pci/fsl_pci_init.c +++ b/drivers/pci/fsl_pci_init.c @@ -444,6 +444,21 @@ void fsl_pci_init(struct pci_controller *hose, struct fsl_pci_info *pci_info) ltssm = (in_be32(&pci->pex_csr0) & PEX_CSR0_LTSSM_MASK) >> PEX_CSR0_LTSSM_SHIFT; enabled = (ltssm == 0x11) ? 1 : 0; +#ifdef CONFIG_FSL_PCIE_RESET + int i; + /* assert PCIe reset */ + setbits_be32(&pci->pdb_stat, 0x08000000); + (void) in_be32(&pci->pdb_stat); + udelay(1000); + /* clear PCIe reset */ + clrbits_be32(&pci->pdb_stat, 0x08000000); + asm("sync;isync"); + for (i = 0; i < 100 && ltssm < PCI_LTSSM_L0; i++) { + pci_hose_read_config_word(hose, dev, PCI_LTSSM, + <ssm); + udelay(1000); + } +#endif } else { /* pci_hose_read_config_word(hose, dev, PCI_LTSSM, <ssm); */ /* enabled = ltssm >= PCI_LTSSM_L0; */ |