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Thu, 23 Apr 2026 05:18:24 +0000 From: Jamin Lin To: "philmd@linaro.org" , "peterx@redhat.com" , =?iso-8859-1?Q?C=E9dric_Le_Goater?= , Peter Maydell , Steven Lee , Troy Lee , Kane Chen , Andrew Jeffery , Joel Stanley , Marcel Apfelbaum , Yanan Wang , Zhao Liu , "open list:ASPEED BMCs" , "open list:All patches CC here" CC: Jamin Lin , Troy Lee , "flwu@google.com" , "nabihestefan@google.com" , "farosas@suse.de" Subject: [PATCH v4 15/17] hw/arm/aspeed_ast27x0: Set EHCI ctrldssegment-default Thread-Topic: [PATCH v4 15/17] hw/arm/aspeed_ast27x0: Set EHCI ctrldssegment-default Thread-Index: AQHc0uCbSyMG079kM06VmrlH+yoZFg== Date: Thu, 23 Apr 2026 05:18:23 +0000 Message-ID: <20260423051804.362095-16-jamin_lin@aspeedtech.com> References: <20260423051804.362095-1-jamin_lin@aspeedtech.com> In-Reply-To: <20260423051804.362095-1-jamin_lin@aspeedtech.com> Accept-Language: zh-TW, en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: authentication-results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=aspeedtech.com; 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envelope-from=jamin_lin@aspeedtech.com; helo=OS8PR02CU002.outbound.protection.outlook.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-arm@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org Sender: qemu-arm-bounces+qemu-arm=archiver.kernel.org@nongnu.org On AST2700 platforms, system DRAM is mapped above 4GB with a base=0A= address at 0x400000000.=0A= =0A= The Linux EHCI driver programs the segment register to zero when=0A= 64-bit addressing is supported. As a result, descriptor addresses=0A= derived from the EHCI registers do not include the DRAM base=0A= address.=0A= =0A= Descriptor memory is allocated through the DMA API with a 64-bit=0A= DMA mask, allowing descriptors to reside in DRAM above 4GB. On=0A= AST2700, EHCI queue heads (QH) and queue element transfer=0A= descriptors (qTD) are therefore placed at addresses starting from=0A= 0x400000000.=0A= =0A= Set the ctrldssegment-default property to 0x4 so the upper=0A= 32 bits of descriptor addresses are adjusted accordingly. This=0A= allows the emulated EHCI controller to construct correct system=0A= addresses when accessing descriptors in DRAM above 4GB.=0A= =0A= Signed-off-by: Jamin Lin =0A= ---=0A= hw/arm/aspeed_ast27x0.c | 2 ++=0A= 1 file changed, 2 insertions(+)=0A= =0A= diff --git a/hw/arm/aspeed_ast27x0.c b/hw/arm/aspeed_ast27x0.c=0A= index 87dcb82e1b..0cb39dc191 100644=0A= --- a/hw/arm/aspeed_ast27x0.c=0A= +++ b/hw/arm/aspeed_ast27x0.c=0A= @@ -856,6 +856,8 @@ static void aspeed_soc_ast2700_realize(DeviceState *dev= , Error **errp)=0A= =0A= /* EHCI */=0A= for (i =3D 0; i < sc->ehcis_num; i++) {=0A= + object_property_set_int(OBJECT(&s->ehci[i]), "ctrldssegment-defaul= t",=0A= + 0x4, &error_abort);=0A= if (!sysbus_realize(SYS_BUS_DEVICE(&s->ehci[i]), errp)) {=0A= return;=0A= }=0A= -- =0A= 2.43.0=0A=