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Wed, 15 Feb 2023 03:20:25 -0800 (PST) Received: from [10.225.163.116] (unknown [10.225.163.116]) by usg-ed-osssrv.wdc.com (Postfix) with ESMTPSA id 4PGwbn61f9z1RvLy; Wed, 15 Feb 2023 03:20:21 -0800 (PST) Message-ID: Date: Wed, 15 Feb 2023 20:20:20 +0900 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:102.0) Gecko/20100101 Thunderbird/102.7.1 Subject: Re: [PATCH v2 8/9] PCI: rockchip: Use u32 variable to access 32-bit registers Content-Language: en-US To: David Laight , Rick Wertenbroek , "alberto.dassatti@heig-vd.ch" Cc: "xxm@rock-chips.com" , "rick.wertenbroek@heig-vd.ch" , "stable@vger.kernel.org" , Rob Herring , Krzysztof Kozlowski , Heiko Stuebner , Shawn Lin , Lorenzo Pieralisi , =?UTF-8?Q?Krzysztof_Wilczy=c5=84ski?= , Bjorn Helgaas , Jani Nikula , Rodrigo Vivi , Mikko Kovanen , Greg Kroah-Hartman , "devicetree@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , "linux-rockchip@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-pci@vger.kernel.org" References: <20230214140858.1133292-1-rick.wertenbroek@gmail.com> <20230214140858.1133292-9-rick.wertenbroek@gmail.com> <0fa5cef4-7096-7f59-422a-98011d01437c@opensource.wdc.com> <2a80c4e1f1ad42c6849521d1e644b003@AcuMS.aculab.com> From: Damien Le Moal Organization: Western Digital Research In-Reply-To: <2a80c4e1f1ad42c6849521d1e644b003@AcuMS.aculab.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230215_032028_181110_2335DE3A X-CRM114-Status: GOOD ( 21.12 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2/15/23 19:46, David Laight wrote: > From: Damien Le Moal >> Sent: 15 February 2023 01:34 >> >> On 2/14/23 23:08, Rick Wertenbroek wrote: >>> 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@vger.kernel.org >>> Signed-off-by: Rick Wertenbroek >>> --- >>> 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 ca5b363ba..b7865a94e 100644 >>> --- a/drivers/pci/controller/pcie-rockchip-ep.c >>> +++ b/drivers/pci/controller/pcie-rockchip-ep.c >>> @@ -292,15 +292,15 @@ 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) | >> >> ROCKCHIP_PCIE_EP_MSI_CTRL_MMC_OFFSET is 17 and multi_msg_cap is a u8... >> Not nice. > > It really doesn't matter. > As soon as you do any arithmetic char and short are promoted to int. OK. Thanks. -- Damien Le Moal Western Digital Research _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel