linux-kernel - [PATCH v4 09/11] PCI: rockchip: Use u32 variable to access 32-bit registers

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Message-Id: <20230417092631.347976-10-rick.wertenbroek@gmail.com>
Date:   Mon, 17 Apr 2023 11:26:27 +0200
From:   Rick Wertenbroek <rick.wertenbroek@...il.com>
To:     alberto.dassatti@...g-vd.ch
Cc:     xxm@...k-chips.com, Rick Wertenbroek <rick.wertenbroek@...il.com>,
        stable@...r.kernel.org, Damien Le Moal <dlemoal@...nel.org>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Caleb Connolly <kc@...tmarketos.org>,
        Johan Jonker <jbx6244@...il.com>,
        Brian Norris <briannorris@...omium.org>,
        Corentin Labbe <clabbe@...libre.com>,
        Arnaud Ferraris <arnaud.ferraris@...labora.com>,
        Sascha Hauer <s.hauer@...gutronix.de>,
        Judy Hsiao <judyhsiao@...omium.org>,
        Hugh Cole-Baker <sigmaris@...il.com>,
        linux-pci@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH v4 09/11] PCI: rockchip: Use u32 variable to access 32-bit registers

Previously u16 variables were used to access 32-bit registers, this
resulted in not all of the data being read from the registers. Also
the left shift of more than 16-bits would result in moving data out
of the variable. Use u32 variables to access 32-bit registers

Fixes: cf590b078391 ("PCI: rockchip: Add EP driver for Rockchip PCIe controller")
Cc: stable@...r.kernel.org
Signed-off-by: Rick Wertenbroek <rick.wertenbroek@...il.com>
Tested-by: Damien Le Moal <dlemoal@...nel.org>
---
 drivers/pci/controller/pcie-rockchip-ep.c | 10 +++++-----
 drivers/pci/controller/pcie-rockchip.h    |  1 +
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/drivers/pci/controller/pcie-rockchip-ep.c b/drivers/pci/controller/pcie-rockchip-ep.c
index 771f1bb93251..63fbb379638b 100644
--- a/drivers/pci/controller/pcie-rockchip-ep.c
+++ b/drivers/pci/controller/pcie-rockchip-ep.c
@@ -271,15 +271,15 @@ static int rockchip_pcie_ep_set_msi(struct pci_epc *epc, u8 fn, u8 vfn,
 {
 	struct rockchip_pcie_ep *ep = epc_get_drvdata(epc);
 	struct rockchip_pcie *rockchip = &ep->rockchip;
-	u16 flags;
+	u32 flags;
 
 	flags = rockchip_pcie_read(rockchip,
 				   ROCKCHIP_PCIE_EP_FUNC_BASE(fn) +
 				   ROCKCHIP_PCIE_EP_MSI_CTRL_REG);
 	flags &= ~ROCKCHIP_PCIE_EP_MSI_CTRL_MMC_MASK;
 	flags |=
-	   ((multi_msg_cap << 1) <<  ROCKCHIP_PCIE_EP_MSI_CTRL_MMC_OFFSET) |
-	   PCI_MSI_FLAGS_64BIT;
+	   (multi_msg_cap << ROCKCHIP_PCIE_EP_MSI_CTRL_MMC_OFFSET) |
+	   (PCI_MSI_FLAGS_64BIT << ROCKCHIP_PCIE_EP_MSI_FLAGS_OFFSET);
 	flags &= ~ROCKCHIP_PCIE_EP_MSI_CTRL_MASK_MSI_CAP;
 	rockchip_pcie_write(rockchip, flags,
 			    ROCKCHIP_PCIE_EP_FUNC_BASE(fn) +
@@ -291,7 +291,7 @@ static int rockchip_pcie_ep_get_msi(struct pci_epc *epc, u8 fn, u8 vfn)
 {
 	struct rockchip_pcie_ep *ep = epc_get_drvdata(epc);
 	struct rockchip_pcie *rockchip = &ep->rockchip;
-	u16 flags;
+	u32 flags;
 
 	flags = rockchip_pcie_read(rockchip,
 				   ROCKCHIP_PCIE_EP_FUNC_BASE(fn) +
@@ -352,7 +352,7 @@ static int rockchip_pcie_ep_send_msi_irq(struct rockchip_pcie_ep *ep, u8 fn,
 					 u8 interrupt_num)
 {
 	struct rockchip_pcie *rockchip = &ep->rockchip;
-	u16 flags, mme, data, data_mask;
+	u32 flags, mme, data, data_mask;
 	u8 msi_count;
 	u64 pci_addr;
 	u32 r;
diff --git a/drivers/pci/controller/pcie-rockchip.h b/drivers/pci/controller/pcie-rockchip.h
index bef6d7098a2f..501d859420b4 100644
--- a/drivers/pci/controller/pcie-rockchip.h
+++ b/drivers/pci/controller/pcie-rockchip.h
@@ -227,6 +227,7 @@
 #define ROCKCHIP_PCIE_EP_CMD_STATUS			0x4
 #define   ROCKCHIP_PCIE_EP_CMD_STATUS_IS		BIT(19)
 #define ROCKCHIP_PCIE_EP_MSI_CTRL_REG			0x90
+#define   ROCKCHIP_PCIE_EP_MSI_FLAGS_OFFSET		16
 #define   ROCKCHIP_PCIE_EP_MSI_CTRL_MMC_OFFSET		17
 #define   ROCKCHIP_PCIE_EP_MSI_CTRL_MMC_MASK		GENMASK(19, 17)
 #define   ROCKCHIP_PCIE_EP_MSI_CTRL_MME_OFFSET		20
-- 
2.25.1