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Tue, 10 Dec 2019 05:23:29 -0800 (PST) From: Al Cooper To: linux-kernel@vger.kernel.org Subject: [PATCH v3 01/13] phy: usb: EHCI DMA may lose a burst of DMA data for 7255xA0 family Date: Tue, 10 Dec 2019 08:21:20 -0500 Message-Id: <20191210132132.41509-2-alcooperx@gmail.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20191210132132.41509-1-alcooperx@gmail.com> References: <20191210132132.41509-1-alcooperx@gmail.com> X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20191210_052331_574171_6A73FC71 X-CRM114-Status: GOOD ( 14.66 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Mark Rutland , devicetree@vger.kernel.org, Florian Fainelli , Al Cooper , Kishon Vijay Abraham I , Rob Herring , bcm-kernel-feedback-list@broadcom.com, Srinath Mannam , linux-arm-kernel@lists.infradead.org MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org When the EHCI controller received a 512 byte USB packet that had to be broken into 2 256 byte bursts across the SCB bus AND there was a following 512 byte USB packet, the second burst of data from the first packet was sometimes being lost. If the burst size was changed to 128 bytes via the EBR_SCB_SIZE field in the USB_CTRL_EBRIDGE register we'd see the 4th 128 byte burst of the first packet being lost. This problem became much worse if other threads were running that accessed memory, like a memcpy test. Setting the EBR_SCB_SIZE to 512, which prevents breaking the EHCI USB packet (max size of 512 bytes) into bursts, fixed the problem. Signed-off-by: Al Cooper --- drivers/phy/broadcom/phy-brcm-usb-init.c | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/drivers/phy/broadcom/phy-brcm-usb-init.c b/drivers/phy/broadcom/phy-brcm-usb-init.c index 91b5b09589d6..bd473d12ab28 100644 --- a/drivers/phy/broadcom/phy-brcm-usb-init.c +++ b/drivers/phy/broadcom/phy-brcm-usb-init.c @@ -42,6 +42,7 @@ #define USB_CTRL_PLL_CTL_PLL_IDDQ_PWRDN_MASK 0x80000000 /* option */ #define USB_CTRL_EBRIDGE 0x0c #define USB_CTRL_EBRIDGE_ESTOP_SCB_REQ_MASK 0x00020000 /* option */ +#define USB_CTRL_EBRIDGE_EBR_SCB_SIZE_MASK 0x00000f80 /* option */ #define USB_CTRL_OBRIDGE 0x10 #define USB_CTRL_OBRIDGE_LS_KEEP_ALIVE_MASK 0x08000000 #define USB_CTRL_MDIO 0x14 @@ -176,6 +177,7 @@ static const struct id_to_type id_to_type_table[] = { { 0x33900000, BRCM_FAMILY_3390A0 }, { 0x72500010, BRCM_FAMILY_7250B0 }, { 0x72600000, BRCM_FAMILY_7260A0 }, + { 0x72550000, BRCM_FAMILY_7260A0 }, { 0x72680000, BRCM_FAMILY_7271A0 }, { 0x72710000, BRCM_FAMILY_7271A0 }, { 0x73640000, BRCM_FAMILY_7364A0 }, @@ -948,6 +950,17 @@ void brcm_usb_init_eohci(struct brcm_usb_init_params *params) if (params->selected_family == BRCM_FAMILY_7271A0) /* Enable LS keep alive fix for certain keyboards */ USB_CTRL_SET(ctrl, OBRIDGE, LS_KEEP_ALIVE); + + if (params->family_id == 0x72550000) { + /* + * Make the burst size 512 bytes to fix a hardware bug + * on the 7255a0. See HW7255-24. + */ + reg = brcmusb_readl(USB_CTRL_REG(ctrl, EBRIDGE)); + reg &= ~USB_CTRL_MASK(EBRIDGE, EBR_SCB_SIZE); + reg |= 0x800; + brcmusb_writel(reg, USB_CTRL_REG(ctrl, EBRIDGE)); + } } void brcm_usb_init_xhci(struct brcm_usb_init_params *params) -- 2.17.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel