On 26/06/18 18:46, ernest.zhang wrote:
> Add MSI interrupt support if the SD host device can support MSI interrupt.
>
> Signed-off-by: ernest.zhang <ernest.zhang@xxxxxxxxxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
> ---
> Changes in V6:
> 1. Move change log to correct place.
> 2. Reduce unneeded pr_info prints.
> 3. In function sdhci_pci_o2_probe_slot, remove using local
> variable 'mmc' instead of using 'host->mmc'.
> 3. Make the msi enable code a sperate function.
>
> Changes in V5:
> 1. Because pci_enable_msi is marked as deprecated and should not be
> used in new code, use pci_alloc_irq_vectors instead.
> 2. Remove unneeded CONFIG_PCI_MSI macro check.
>
> Changes in V4:
> Enable MSI interrupt if the MSI capability bit is set in
> capability register.
> ---
> drivers/mmc/host/sdhci-pci-o2micro.c | 25 +++++++++++++++++++++++++
> 1 file changed, 25 insertions(+)
>
> diff --git a/drivers/mmc/host/sdhci-pci-o2micro.c b/drivers/mmc/host/sdhci-pci-o2micro.c
> index 7747e8b..56bc717 100644
> --- a/drivers/mmc/host/sdhci-pci-o2micro.c
> +++ b/drivers/mmc/host/sdhci-pci-o2micro.c
> @@ -260,6 +260,29 @@ static void sdhci_pci_o2_fujin2_pci_init(struct sdhci_pci_chip *chip)
> pci_write_config_dword(chip->pdev, O2_SD_MISC_CTRL4, scratch_32);
> }
>
> +static void sdhci_pci_o2_enable_msi(struct sdhci_pci_chip *chip,
> + struct sdhci_host *host)
> +{
> + int ret;
> +
> + ret = pci_find_capability(chip->pdev, PCI_CAP_ID_MSI);
> + if (!ret) {
> + pr_info("%s: unsupport msi, use INTx irq\n",
> + mmc_hostname(host->mmc));
> + return;
> + }
> +
> + ret = pci_alloc_irq_vectors(chip->pdev, 1, 1,
> + PCI_IRQ_MSI | PCI_IRQ_MSIX);
> + if (ret < 0) {
> + pr_err("%s: enable PCI MSI failed, err=%d\n",
> + mmc_hostname(host->mmc), ret);
> + return;
> + }
> +
> + host->irq = pci_irq_vector(chip->pdev, 0);
> +}
> +
> int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
> {
> struct sdhci_pci_chip *chip;
> @@ -279,6 +302,8 @@ int sdhci_pci_o2_probe_slot(struct sdhci_pci_slot *slot)
> if (reg & 0x1)
> host->quirks |= SDHCI_QUIRK_MULTIBLOCK_READ_ACMD12;
>
> + sdhci_pci_o2_enable_msi(chip, host);
> +
> if (chip->pdev->device == PCI_DEVICE_ID_O2_SEABIRD0) {
> ret = pci_read_config_dword(chip->pdev,
> O2_SD_MISC_SETTING, ®);
>
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