[U-Boot] [PATCH v3] T2080QDS/PCIe: Soft Reset PCIe on T2080QDS for down-training issue
Zhao Qiang
B45475 at freescale.com
Thu Mar 26 09:13:09 CET 2015
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 at freescale.com>
---
changes for v2
- modify the commit message
changes for v3
- use CONFIG_FSL_PCIE_RESET instead of CONFIG_FSL_PCIE_T2080QDS_RESET
drivers/pci/fsl_pci_init.c | 15 +++++++++++++++
include/configs/T208xQDS.h | 1 +
2 files changed, 16 insertions(+)
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; */
diff --git a/include/configs/T208xQDS.h b/include/configs/T208xQDS.h
index 395472b..839896a 100644
--- a/include/configs/T208xQDS.h
+++ b/include/configs/T208xQDS.h
@@ -558,6 +558,7 @@ 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 */
--
2.1.0.27.g96db324
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