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[144.168.56.201]) by smtp.gmail.com with ESMTPSA id g2sm7174467pfo.154.2021.08.31.20.27.38 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 31 Aug 2021 20:27:40 -0700 (PDT) From: Bin Meng To: Damien Hedde , "Edgar E . Iglesias" , Alistair Francis , Peter Maydell , =?utf-8?q?Philippe_Mathieu-Daud?= =?utf-8?q?=C3=A9?= Subject: [PATCH v2 3/5] hw/char: cadence_uart: Move clock/reset check to uart_can_receive() Date: Wed, 1 Sep 2021 11:27:22 +0800 Message-Id: <20210901032724.23256-4-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210901032724.23256-1-bmeng.cn@gmail.com> References: <20210901032724.23256-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Received-SPF: pass client-ip=2607:f8b0:4864:20::62b; envelope-from=bmeng.cn@gmail.com; helo=mail-pl1-x62b.google.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, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: qemu-arm@nongnu.org, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Currently the clock/reset check is done in uart_receive(), but we can move the check to uart_can_receive() which is earlier. Signed-off-by: Bin Meng Reviewed-by: Alistair Francis Reviewed-by: Philippe Mathieu-Daudé --- Changes in v2: - avoid declaring variables mid-scope hw/char/cadence_uart.c | 17 ++++++++++------- 1 file changed, 10 insertions(+), 7 deletions(-) diff --git a/hw/char/cadence_uart.c b/hw/char/cadence_uart.c index 154be34992..fff8be3619 100644 --- a/hw/char/cadence_uart.c +++ b/hw/char/cadence_uart.c @@ -235,8 +235,16 @@ static void uart_parameters_setup(CadenceUARTState *s) static int uart_can_receive(void *opaque) { CadenceUARTState *s = opaque; - int ret = MAX(CADENCE_UART_RX_FIFO_SIZE, CADENCE_UART_TX_FIFO_SIZE); - uint32_t ch_mode = s->r[R_MR] & UART_MR_CHMODE; + int ret; + uint32_t ch_mode; + + /* ignore characters when unclocked or in reset */ + if (!clock_is_enabled(s->refclk) || device_is_in_reset(DEVICE(s))) { + return 0; + } + + ret = MAX(CADENCE_UART_RX_FIFO_SIZE, CADENCE_UART_TX_FIFO_SIZE); + ch_mode = s->r[R_MR] & UART_MR_CHMODE; if (ch_mode == NORMAL_MODE || ch_mode == ECHO_MODE) { ret = MIN(ret, CADENCE_UART_RX_FIFO_SIZE - s->rx_count); @@ -358,11 +366,6 @@ static void uart_receive(void *opaque, const uint8_t *buf, int size) CadenceUARTState *s = opaque; uint32_t ch_mode = s->r[R_MR] & UART_MR_CHMODE; - /* ignore characters when unclocked or in reset */ - if (!clock_is_enabled(s->refclk) || device_is_in_reset(DEVICE(s))) { - return; - } - if (ch_mode == NORMAL_MODE || ch_mode == ECHO_MODE) { uart_write_rx_fifo(opaque, buf, size); }