linux-kernel - Re: [PATCH v5 4/5] PCI: mediatek: convert bool to single flags entry and bitmap

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Message-ID: <675d5338-09f0-439b-b22c-a3d50b243b5e@collabora.com>
Date: Tue, 14 Oct 2025 13:46:04 +0200
From: AngeloGioacchino Del Regno <angelogioacchino.delregno@...labora.com>
To: Christian Marangi <ansuelsmth@...il.com>,
 Ryder Lee <ryder.lee@...iatek.com>, Jianjun Wang
 <jianjun.wang@...iatek.com>, Bjorn Helgaas <bhelgaas@...gle.com>,
 Lorenzo Pieralisi <lpieralisi@...nel.org>,
 Krzysztof Wilczyński <kwilczynski@...nel.org>,
 Manivannan Sadhasivam <mani@...nel.org>, Rob Herring <robh@...nel.org>,
 Krzysztof Kozlowski <krzk+dt@...nel.org>, Conor Dooley
 <conor+dt@...nel.org>, Matthias Brugger <matthias.bgg@...il.com>,
 linux-pci@...r.kernel.org, linux-mediatek@...ts.infradead.org,
 devicetree@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-arm-kernel@...ts.infradead.org, upstream@...oha.com
Subject: Re: [PATCH v5 4/5] PCI: mediatek: convert bool to single flags entry
 and bitmap

Il 12/10/25 22:56, Christian Marangi ha scritto:
> To clean Mediatek SoC PCIe struct, convert all the bool to a bitmap and
> use a single flags to reference all the values. This permits cleaner
> addition of new flag without having to define a new bool in the struct.
> 
> Signed-off-by: Christian Marangi <ansuelsmth@...il.com>
> ---
>   drivers/pci/controller/pcie-mediatek.c | 28 +++++++++++++++-----------
>   1 file changed, 16 insertions(+), 12 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-mediatek.c b/drivers/pci/controller/pcie-mediatek.c
> index 24cc30a2ab6c..1678461e56d3 100644
> --- a/drivers/pci/controller/pcie-mediatek.c
> +++ b/drivers/pci/controller/pcie-mediatek.c
> @@ -142,24 +142,29 @@
>   
>   struct mtk_pcie_port;
>   
> +enum mtk_pcie_flags {

enum mtk_pcie_quirks seems to be a better fit here, as this is used for... well..
quirks.

> +	NEED_FIX_CLASS_ID = BIT(0), /* host's class ID needed to be fixed */
> +	NEED_FIX_DEVICE_ID = BIT(1), /* host's device ID needed to be fixed */
> +	NO_MSI = BIT(2), /* Bridge has no MSI support, and relies on an
> +			  * external block
> +			  */

Also perhaps... MTK_PCIE_FIX_CLASS_ID, MTK_PCIE_FIX_DEV_ID, MTK_PCIE_NO_MSI

> +};
> +
>   /**
>    * struct mtk_pcie_soc - differentiate between host generations
> - * @need_fix_class_id: whether this host's class ID needed to be fixed or not
> - * @need_fix_device_id: whether this host's device ID needed to be fixed or not
>    * @no_msi: Bridge has no MSI support, and relies on an external block
>    * @device_id: device ID which this host need to be fixed
>    * @ops: pointer to configuration access functions
>    * @startup: pointer to controller setting functions
>    * @setup_irq: pointer to initialize IRQ functions
> + * @flags: pcie device flags.
>    */
>   struct mtk_pcie_soc {
> -	bool need_fix_class_id;
> -	bool need_fix_device_id;
> -	bool no_msi;
>   	unsigned int device_id;
>   	struct pci_ops *ops;
>   	int (*startup)(struct mtk_pcie_port *port);
>   	int (*setup_irq)(struct mtk_pcie_port *port, struct device_node *node);
> +	u32 flags;

u32 flags -> enum mtk_pcie_quirks quirks

Cheers,
Angelo

>   };
>   
>   /**
> @@ -703,7 +708,7 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
>   	writel(val, port->base + PCIE_RST_CTRL);
>   
>   	/* Set up vendor ID and class code */
> -	if (soc->need_fix_class_id) {
> +	if (soc->flags & NEED_FIX_CLASS_ID) {
>   		val = PCI_VENDOR_ID_MEDIATEK;
>   		writew(val, port->base + PCIE_CONF_VEND_ID);
>   
> @@ -711,7 +716,7 @@ static int mtk_pcie_startup_port_v2(struct mtk_pcie_port *port)
>   		writew(val, port->base + PCIE_CONF_CLASS_ID);
>   	}
>   
> -	if (soc->need_fix_device_id)
> +	if (soc->flags & NEED_FIX_DEVICE_ID)
>   		writew(soc->device_id, port->base + PCIE_CONF_DEVICE_ID);
>   
>   	/* 100ms timeout value should be enough for Gen1/2 training */
> @@ -1099,7 +1104,7 @@ static int mtk_pcie_probe(struct platform_device *pdev)
>   
>   	host->ops = pcie->soc->ops;
>   	host->sysdata = pcie;
> -	host->msi_domain = pcie->soc->no_msi;
> +	host->msi_domain = !!(pcie->soc->flags & NO_MSI);
>   
>   	err = pci_host_probe(host);
>   	if (err)
> @@ -1187,9 +1192,9 @@ static const struct dev_pm_ops mtk_pcie_pm_ops = {
>   };
>   
>   static const struct mtk_pcie_soc mtk_pcie_soc_v1 = {
> -	.no_msi = true,
>   	.ops = &mtk_pcie_ops,
>   	.startup = mtk_pcie_startup_port,
> +	.flags = NO_MSI,
>   };
>   
>   static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = {
> @@ -1199,19 +1204,18 @@ static const struct mtk_pcie_soc mtk_pcie_soc_mt2712 = {
>   };
>   
>   static const struct mtk_pcie_soc mtk_pcie_soc_mt7622 = {
> -	.need_fix_class_id = true,
>   	.ops = &mtk_pcie_ops_v2,
>   	.startup = mtk_pcie_startup_port_v2,
>   	.setup_irq = mtk_pcie_setup_irq,
> +	.flags = NEED_FIX_CLASS_ID,
>   };
>   
>   static const struct mtk_pcie_soc mtk_pcie_soc_mt7629 = {
> -	.need_fix_class_id = true,
> -	.need_fix_device_id = true,
>   	.device_id = PCI_DEVICE_ID_MEDIATEK_7629,
>   	.ops = &mtk_pcie_ops_v2,
>   	.startup = mtk_pcie_startup_port_v2,
>   	.setup_irq = mtk_pcie_setup_irq,
> +	.flags = NEED_FIX_CLASS_ID | NEED_FIX_DEVICE_ID,
>   };
>   
>   static const struct of_device_id mtk_pcie_ids[] = {