linux-kernel - Re: [PATCH V7 5/5] mmc: sdhci: Add MSI interrupt support for O2 SD host

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Date:   Wed, 25 Jul 2018 10:48:47 +0300
From:   Adrian Hunter <adrian.hunter@...el.com>
To:     "ernest.zhang" <ernest.zhang@...hubtech.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     chuanjin.pang@...hubtech.com, mike.li@...hubtech.com,
        chevron.li@...hubtech.com, shirley.her@...hubtech.com,
        xiaoguang.yu@...hubtech.com, bobby.wu@...hubtech.com
Subject: Re: [PATCH V7 5/5] mmc: sdhci: Add MSI interrupt support for O2 SD
 host

On 16/07/18 09:26, ernest.zhang wrote:
> Add MSI interrupt support if the SD host device can support MSI interrupt.
> 
> Signed-off-by: ernest.zhang <ernest.zhang@...hubtech.com>

Acked-by: Adrian Hunter <adrian.hunter@...el.com>

> ---
> Changes in V7:
> 	N/A
> 
> 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'.
> 	4. 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.
> 
> Changes in V1~V3:
> 	N/A
> ---
>  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 7747e8ba2e3d..56bc71763956 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, &reg);
>