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Tue, 30 Mar 2021 07:24:41 -0700 Received: from mtkcas11.mediatek.inc (172.21.101.40) by mtkmbs08n1.mediatek.inc (172.21.101.55) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Tue, 30 Mar 2021 22:24:39 +0800 Received: from mtksdccf07.mediatek.inc (172.21.84.99) by mtkcas11.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Tue, 30 Mar 2021 22:24:40 +0800 From: Lecopzer Chen To: CC: , , , , , , , Subject: Re: [PATCH] irqchip/gic-v3: Fix IPRIORITYR can't perform byte operations in GIC-600 Date: Tue, 30 Mar 2021 22:24:40 +0800 Message-ID: <20210330142440.30119-1-lecopzer.chen@mediatek.com> X-Mailer: git-send-email 2.18.0 In-Reply-To: <87eefwrash.wl-maz@kernel.org> References: <87eefwrash.wl-maz@kernel.org> MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20210330_152448_552461_4E43AE8D X-CRM114-Status: GOOD ( 20.42 ) 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 [...] > > > > > > > > From the architecture spec: > > > > > > > > > > > > 11.1.3 GIC memory-mapped register access > > > > > > > > In any system, access to the following registers must be supported: > > > > > > > > [...] > > > > * Byte accesses to: > > > > - GICD_IPRIORITYR. > > > > - GICD_ITARGETSR. > > > > - GICD_SPENDSGIR. > > > > - GICD_CPENDSGIR. > > > > - GICR_IPRIORITYR. > > > > > > > > > > > > So if GIC600 doesn't follow this architectural requirement, this is a > > > > HW erratum, and I want an actual description of the HW issue together > > > > with an erratum number. > > > > > > > > Lorenzo, can you please investigate on your side? > > > > > > Sure - I will look into it and report back. > > > > Checked - I don't think this patch is needed so it should be dropped and > > a follow-up discussion can continue in the relevant/appropriate forum - > > if there is anything left to discuss. > > Thanks for having had a look. This really smells like an integration > issue rather than an actual GIC bug. > > Lecopzer, please check with your HW people and potentially ARM, as I > think you are looking at the wrong problem. Thanks a lot for the suggestion and checking, I think I'll back to disscuss with ARM and our HW team to figure out the previous answer from ARM Support in detail. Thanks again! Lecopzer _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel