Add MSI interrupt support if the SD host device can support MSI interrupt.
Changes: Enable MSI interrupt if the MSI capability bit is set in
capability register.
Signed-off-by: ernest.zhang <ernest.zhang@xxxxxxxxxxxxxx>
---
drivers/mmc/host/sdhci-pci-o2micro.c | 17 +++++++++++++++++
1 file changed, 17 insertions(+)
diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
index a918984..7d04f4b 100644
--- a/drivers/mmc/host/sdhci-pci-o2micro.c
+++ b/drivers/mmc/host/sdhci-pci-o2micro.c
@@ -391,6 +391,23 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
if (reg & 0x1)
host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
+#if defined(CONFIG_PCI_MSI)
+ if (pci_find_capability(chip->pdev, PCI_CAP_ID_MSI)) {
+ ret = pci_enable_msi(chip->pdev);
+ if (!ret) {
+ host->irq = chip->pdev->irq;
+ pr_info("%s: use MSI irq, irq=%d\n",
+ mmc_hostname(host->mmc), host->irq);
+ } else {
+ pr_err("%s: enable PCI MSI failed, err=%d\n",
+ mmc_hostname(host->mmc), ret);
+ }
+ } else {
+ pr_info("%s: unsupport msi, use INTx irq\n",
+ mmc_hostname(host->mmc));
+ }
+#endif
+
if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {
ret = pci_read_config_dword(chip->pdev,
O2_SD_MISC_SETTING, ®);
--
2.7.4
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