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Wed, 22 Apr 2020 10:02:03 -0800 Received: from MTKMBS02N1.mediatek.inc (172.21.101.77) by MTKMBS62N1.mediatek.inc (172.29.193.41) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 22 Apr 2020 11:02:12 -0700 Received: from mtkcas08.mediatek.inc (172.21.101.126) by mtkmbs02n1.mediatek.inc (172.21.101.77) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Thu, 23 Apr 2020 02:02:06 +0800 Received: from mtkswgap22.mediatek.inc (172.21.77.33) by mtkcas08.mediatek.inc (172.21.101.73) with Microsoft SMTP Server id 15.0.1497.2 via Frontend Transport; Thu, 23 Apr 2020 02:02:05 +0800 From: To: , , , , , , , Subject: [PATCH v3] tty: serial: don't do termios for BTIF Date: Thu, 23 Apr 2020 02:02:08 +0800 Message-ID: X-Mailer: git-send-email 1.7.9.5 MIME-Version: 1.0 X-MTK: N X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20200422_110223_879480_B7A1B4FA X-CRM114-Status: GOOD ( 11.41 ) X-Spam-Score: -0.2 (/) X-Spam-Report: SpamAssassin version 3.4.4 on bombadil.infradead.org summary: Content analysis details: (-0.2 points) pts rule name description ---- ---------------------- -------------------------------------------------- 0.0 SPF_HELO_NONE SPF: HELO does not publish an SPF Record -0.0 SPF_PASS SPF: sender matches SPF record 0.0 MIME_BASE64_TEXT RAW: Message text disguised using base64 encoding -0.1 DKIM_VALID Message has at least one valid DKIM or DK signature 0.1 DKIM_SIGNED Message has a DKIM or DK signature, not necessarily valid -0.1 DKIM_VALID_AU Message has a valid DKIM or DK signature from author's domain -0.1 DKIM_VALID_EF Message has a valid DKIM or DK signature from envelope-from domain 0.0 UNPARSEABLE_RELAY Informational: message has unparseable relay lines 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: Ryder Lee , Steven Liu , Sean Wang , linux-kernel@vger.kernel.org, linux-mediatek@lists.infradead.org, linux-serial@vger.kernel.org, linux-arm-kernel@lists.infradead.org Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org From: Sean Wang Bluetooth Interface (BTIF) is designed dedicatedly for MediaTek SOC with BT in order to be instead of the UART interface between BT module and Host CPU, and not exported to user space to access. As the UART design, BTIF will be an APB slave and can transmit or receive data by MCU access, but doesn't provide termios function like baudrate and flow control setup. Even LCR on offset 0xC that is just a FAKELCR a. If FAKELCR[7] is equaled to 1, RBR(0x00), THR(0x00), IER(0x04) will not be readable/writable. b. If FAKELCR is equaled to 0xBF, RBR(0x00), THR(0x00), IER(0x04), IIR(0x08), and LSR(0x14) will not be readable/writable. So adding a new capability 'UART_CAP_NTIO' for the unusual unsupported case. Fixes: 1c16ae65e250 ("serial: 8250: of: Add new port type for MediaTek BTIF controller on MT7622/23 SoC") Cc: Steven Liu Suggested-by: Andy Shevchenko Signed-off-by: Sean Wang Signed-off-by: Ryder Lee --- v1->v2: no change on termios->c_cflag and refine commit message v2->v3: change the naming from NMOD to NTIO as TIO is a well established prefix for termios IOCTLs. --- drivers/tty/serial/8250/8250.h | 1 + drivers/tty/serial/8250/8250_port.c | 5 ++++- 2 files changed, 5 insertions(+), 1 deletion(-) diff --git a/drivers/tty/serial/8250/8250.h b/drivers/tty/serial/8250/8250.h index 33ad9d6de532..234d8db470c0 100644 --- a/drivers/tty/serial/8250/8250.h +++ b/drivers/tty/serial/8250/8250.h @@ -82,6 +82,7 @@ struct serial8250_config { #define UART_CAP_MINI (1 << 17) /* Mini UART on BCM283X family lacks: * STOP PARITY EPAR SPAR WLEN5 WLEN6 */ +#define UART_CAP_NTIO (1 << 18) /* UART doesn't do termios */ #define UART_BUG_QUOT (1 << 0) /* UART has buggy quot LSB */ #define UART_BUG_TXEN (1 << 1) /* UART has buggy TX IIR status */ diff --git a/drivers/tty/serial/8250/8250_port.c b/drivers/tty/serial/8250/8250_port.c index 0325f2e53b74..abc974b4113f 100644 --- a/drivers/tty/serial/8250/8250_port.c +++ b/drivers/tty/serial/8250/8250_port.c @@ -286,7 +286,7 @@ static const struct serial8250_config uart_config[] = { .tx_loadsz = 16, .fcr = UART_FCR_ENABLE_FIFO | UART_FCR_CLEAR_RCVR | UART_FCR_CLEAR_XMIT, - .flags = UART_CAP_FIFO, + .flags = UART_CAP_FIFO | UART_CAP_NTIO, }, [PORT_NPCM] = { .name = "Nuvoton 16550", @@ -2544,6 +2544,9 @@ serial8250_do_set_termios(struct uart_port *port, struct ktermios *termios, unsigned long flags; unsigned int baud, quot, frac = 0; + if (up->capabilities & UART_CAP_NTIO) + return; + if (up->capabilities & UART_CAP_MINI) { termios->c_cflag &= ~(CSTOPB | PARENB | PARODD | CMSPAR); if ((termios->c_cflag & CSIZE) == CS5 ||