Re: [RESEND PATCH v9 1/4] PCI: rockchip: Use standard PCIe defines

From: Bjorn Helgaas <helgaas@kernel.org>
To: Geraldo Nascimento <geraldogabriel@gmail.com>
Cc: linux-rockchip@lists.infradead.org,
	"Shawn Lin" <shawn.lin@rock-chips.com>,
	"Lorenzo Pieralisi" <lpieralisi@kernel.org>,
	"Krzysztof Wilczyński" <kw@linux.com>,
	"Manivannan Sadhasivam" <mani@kernel.org>,
	"Rob Herring" <robh@kernel.org>,
	"Bjorn Helgaas" <bhelgaas@google.com>,
	"Heiko Stuebner" <heiko@sntech.de>,
	"Vinod Koul" <vkoul@kernel.org>,
	"Kishon Vijay Abraham I" <kishon@kernel.org>,
	"Rick wertenbroek" <rick.wertenbroek@gmail.com>,
	"Neil Armstrong" <neil.armstrong@linaro.org>,
	"Valmantas Paliksa" <walmis@gmail.com>,
	linux-phy@lists.infradead.org, linux-pci@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org,
	linux-kernel@vger.kernel.org
Subject: Re: [RESEND PATCH v9 1/4] PCI: rockchip: Use standard PCIe defines
Date: Mon, 7 Jul 2025 17:22:10 -0500	[thread overview]
Message-ID: <20250707222210.GA2114615@bhelgaas> (raw)
In-Reply-To: <e81700ef4b49f584bc8834bfb07b6d8995fc1f42.1751322015.git.geraldogabriel@gmail.com>

On Mon, Jun 30, 2025 at 07:24:41PM -0300, Geraldo Nascimento wrote:
> Current code uses custom-defined register offsets and bitfields for
> standard PCIe registers. Change to using standard PCIe defines. Since
> we are now using standard PCIe defines, drop unused custom-defined ones,
> which are now referenced from offset at added Capabilities Register.

> @@ -278,10 +278,10 @@ static void rockchip_pcie_set_power_limit(struct rockchip_pcie *rockchip)
>  		power = power / 10;
>  	}
>  
> -	status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_DCR);
> -	status |= (power << PCIE_RC_CONFIG_DCR_CSPL_SHIFT) |
> -		  (scale << PCIE_RC_CONFIG_DCR_CPLS_SHIFT);
> -	rockchip_pcie_write(rockchip, status, PCIE_RC_CONFIG_DCR);
> +	status = rockchip_pcie_read(rockchip, PCIE_RC_CONFIG_CR + PCI_EXP_DEVCAP);
> +	status |= FIELD_PREP(PCI_EXP_DEVCAP_PWR_VAL, power);
> +	status |= FIELD_PREP(PCI_EXP_DEVCAP_PWR_SCL, scale);

Added #include <linux/bitfield.h> for this:

  CC      drivers/pci/controller/pcie-rockchip-host.o
drivers/pci/controller/pcie-rockchip-host.c: In function ‘rockchip_pcie_set_power_limit’:
drivers/pci/controller/pcie-rockchip-host.c:272:24: error: implicit declaration of function ‘FIELD_MAX’ [-Werror=implicit-function-declaration]
  272 |         while (power > FIELD_MAX(PCI_EXP_DEVCAP_PWR_VAL)) {
      |                        ^~~~~~~~~
drivers/pci/controller/pcie-rockchip-host.c:282:19: error: implicit declaration of function ‘FIELD_PREP’ [-Werror=implicit-function-declaration]
  282 |         status |= FIELD_PREP(PCI_EXP_DEVCAP_PWR_VAL, power);
      |                   ^~~~~~~~~~

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