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msm: pcie: add support for config space recovery for bridges 

Add support to recover the configuration space of bridges during
a resume.

Change-Id: I9bbc025c206ca0f39fac44c8b05c08ea72985dd9
Signed-off-by: Tony Truong <truong@codeaurora.org>
This commit is contained in:
Tony Truong 2014-11-17 16:36:34 -08:00
parent 069f11cbab
commit 04fa922213
1 changed files with 9 additions and 0 deletions
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9
drivers/pci/host/pci-msm.c
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@ -517,6 +517,7 @@ struct msm_pcie_dev_t {
u32 ep_shadow[MAX_DEVICE_NUM][PCIE_CONF_SPACE_DW];
u32 rc_shadow[PCIE_CONF_SPACE_DW];
bool shadow_en;
bool bridge_found;
struct msm_pcie_register_event *event_reg;
unsigned int scm_dev_id;
bool power_on;
@ -1005,6 +1006,8 @@ static void msm_pcie_cfg_recover(struct msm_pcie_dev_t *dev, bool rc)
}
if (rc)
break;
pci_save_state(dev->pcidev_table[i].dev);
cfg += SZ_4K;
}
}
@ -2057,6 +2060,8 @@ static inline void msm_pcie_save_shadow(struct msm_pcie_dev_t *dev,
break;
}
dev->pcidev_table[i].bdf = bdf;
if ((!dev->bridge_found) && (i > 0))
dev->bridge_found = true;
}
if (dev->pcidev_table[i].bdf == bdf) {
dev->ep_shadow[i][word_offset / 4] = wr_val;
@ -4337,6 +4342,7 @@ static int msm_pcie_probe(struct platform_device *pdev)
msm_pcie_dev[rc_idx].wake_counter = 0;
msm_pcie_dev[rc_idx].power_on = false;
msm_pcie_dev[rc_idx].use_msi = false;
msm_pcie_dev[rc_idx].bridge_found = false;
memcpy(msm_pcie_dev[rc_idx].vreg, msm_pcie_vreg_info,
sizeof(msm_pcie_vreg_info));
memcpy(msm_pcie_dev[rc_idx].gpio, msm_pcie_gpio_info,
@ -4692,6 +4698,9 @@ static int msm_pcie_pm_resume(struct pci_dev *dev,
}
}
if (pcie_dev->bridge_found)
msm_pcie_recover_config(dev);
return ret;
}