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T2080QDS/PCIe: Soft Reset PCIe on T2080QDS for down-training issue

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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>
This commit is contained in:
Zhao Qiang 2015-03-26 16:13:09 +08:00 committed by York Sun
parent 373762c34c
commit 5066e62847
2 changed files with 16 additions and 0 deletions
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15
drivers/pci/fsl_pci_init.c
View File

@ -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,
&ltssm);
udelay(1000);
}
#endif
} else {
/* pci_hose_read_config_word(hose, dev, PCI_LTSSM, &ltssm); */
/* enabled = ltssm >= PCI_LTSSM_L0; */

1
include/configs/T208xQDS.h
View File

@ -575,6 +575,7 @@ unsigned long get_board_ddr_clk(void);
#define CONFIG_PCIE2 /* PCIE controler 2 */
#define CONFIG_PCIE3 /* PCIE controler 3 */
#define CONFIG_PCIE4 /* PCIE controler 4 */
#define CONFIG_FSL_PCIE_RESET
#define CONFIG_FSL_PCI_INIT /* Use common FSL init code */
#define CONFIG_SYS_PCI_64BIT /* enable 64-bit PCI resources */
/* controller 1, direct to uli, tgtid 3, Base address 20000 */