linux-kernel - Re: [PATCH 2/3] PCI: dw-rockchip: Reorganize register and bitfield definitions

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Message-ID: <aAeB7fO_LCzi-xCh@ryzen>
Date: Tue, 22 Apr 2025 13:47:57 +0200
From: Niklas Cassel <cassel@...nel.org>
To: Hans Zhang <18255117159@....com>
Cc: lpieralisi@...nel.org, kw@...ux.com, bhelgaas@...gle.com,
	heiko@...ech.de, manivannan.sadhasivam@...aro.org, robh@...nel.org,
	jingoohan1@...il.com, shawn.lin@...k-chips.com,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org,
	linux-rockchip@...ts.infradead.org
Subject: Re: [PATCH 2/3] PCI: dw-rockchip: Reorganize register and bitfield
 definitions

On Tue, Apr 22, 2025 at 07:28:29PM +0800, Hans Zhang wrote:
> Register definitions were scattered with ambiguous names (e.g.,
> PCIE_RDLH_LINK_UP_CHGED in PCIE_CLIENT_INTR_STATUS_MISC) and lacked
> hierarchical grouping. Magic values for bit operations reduced code
> clarity.
> 
> Group registers and their associated bitfields logically. This improves
> maintainability and aligns the code with hardware documentation.
> 
> Signed-off-by: Hans Zhang <18255117159@....com>
> ---
>  drivers/pci/controller/dwc/pcie-dw-rockchip.c | 42 +++++++++++--------
>  1 file changed, 24 insertions(+), 18 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-dw-rockchip.c b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> index fd5827bbfae3..cdc8afc6cfc1 100644
> --- a/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> +++ b/drivers/pci/controller/dwc/pcie-dw-rockchip.c
> @@ -8,6 +8,7 @@
>   * Author: Simon Xue <xxm@...k-chips.com>
>   */
>  
> +#include <linux/bitfield.h>
>  #include <linux/clk.h>
>  #include <linux/gpio/consumer.h>
>  #include <linux/irqchip/chained_irq.h>
> @@ -34,30 +35,35 @@
>  
>  #define to_rockchip_pcie(x) dev_get_drvdata((x)->dev)
>  
> -#define PCIE_CLIENT_RC_MODE		HIWORD_UPDATE_BIT(0x40)
> -#define PCIE_CLIENT_EP_MODE		HIWORD_UPDATE(0xf0, 0x0)
> -#define PCIE_CLIENT_ENABLE_LTSSM	HIWORD_UPDATE_BIT(0xc)
> -#define PCIE_CLIENT_DISABLE_LTSSM	HIWORD_UPDATE(0x0c, 0x8)
> -#define PCIE_CLIENT_INTR_STATUS_MSG_RX	0x04
> +#define PCIE_CLIENT_GENERAL_CONTROL	0x0
> +#define  PCIE_CLIENT_RC_MODE		HIWORD_UPDATE_BIT(0x40)
> +#define  PCIE_CLIENT_EP_MODE		HIWORD_UPDATE(0xf0, 0x0)
> +#define  PCIE_CLIENT_ENABLE_LTSSM	HIWORD_UPDATE_BIT(0xc)
> +#define  PCIE_CLIENT_DISABLE_LTSSM	HIWORD_UPDATE(0x0c, 0x8)
> +
> +#define PCIE_CLIENT_INTR_STATUS_MSG_RX	0x4
> +#define PCIE_CLIENT_INTR_STATUS_LEGACY	0x8
> +
>  #define PCIE_CLIENT_INTR_STATUS_MISC	0x10
> +#define  PCIE_RDLH_LINK_UP_CHGED	BIT(1)
> +#define  PCIE_LINK_REQ_RST_NOT_INT	BIT(2)
> +
> +#define PCIE_CLIENT_INTR_MASK_LEGACY	0x1c
>  #define PCIE_CLIENT_INTR_MASK_MISC	0x24
> +
>  #define PCIE_CLIENT_POWER		0x2c
> +#define  PME_READY_ENTER_L23		BIT(3)
> +
>  #define PCIE_CLIENT_MSG_GEN		0x34
> -#define PME_READY_ENTER_L23		BIT(3)
> -#define PME_TURN_OFF			(BIT(4) | BIT(20))
> -#define PME_TO_ACK			(BIT(9) | BIT(25))
> -#define PCIE_SMLH_LINKUP		BIT(16)
> -#define PCIE_RDLH_LINKUP		BIT(17)
> -#define PCIE_LINKUP			(PCIE_SMLH_LINKUP | PCIE_RDLH_LINKUP)
> -#define PCIE_RDLH_LINK_UP_CHGED		BIT(1)
> -#define PCIE_LINK_REQ_RST_NOT_INT	BIT(2)
> -#define PCIE_CLIENT_GENERAL_CONTROL	0x0
> -#define PCIE_CLIENT_INTR_STATUS_LEGACY	0x8
> -#define PCIE_CLIENT_INTR_MASK_LEGACY	0x1c
> +#define  PME_TURN_OFF			HIWORD_UPDATE_BIT(BIT(4))
> +#define  PME_TO_ACK			HIWORD_UPDATE_BIT(BIT(9))
> +
>  #define PCIE_CLIENT_HOT_RESET_CTRL	0x180
> +#define  PCIE_LTSSM_ENABLE_ENHANCE	BIT(4)
> +
>  #define PCIE_CLIENT_LTSSM_STATUS	0x300
> -#define PCIE_LTSSM_ENABLE_ENHANCE	BIT(4)
> -#define PCIE_LTSSM_STATUS_MASK		GENMASK(5, 0)
> +#define  PCIE_LINKUP_MASK		GENMASK(17, 16)

Here you are adding a macro (PCIE_LINKUP_MASK) that is not used.

I suggest that you move the addition to the patch where it is actually used.


Kind regards,
Niklas