| stm32-usart.c (48ee4835b73c48590d05a54730dc8037ebd39d3b) | stm32-usart.c (d3d079bde07e1b7deaeb57506dc0b86010121d17) |
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| 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) Maxime Coquelin 2015 4 * Copyright (C) STMicroelectronics SA 2017 5 * Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com> 6 * Gerald Baeza <gerald.baeza@foss.st.com> 7 * Erwan Le Ray <erwan.leray@foss.st.com> 8 * --- 536 unchanged lines hidden (view full) --- 545 stm32_usart_transmit_chars_pio(port); 546} 547 548static void stm32_usart_transmit_chars(struct uart_port *port) 549{ 550 struct stm32_port *stm32_port = to_stm32_port(port); 551 const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; 552 struct circ_buf *xmit = &port->state->xmit; | 1// SPDX-License-Identifier: GPL-2.0 2/* 3 * Copyright (C) Maxime Coquelin 2015 4 * Copyright (C) STMicroelectronics SA 2017 5 * Authors: Maxime Coquelin <mcoquelin.stm32@gmail.com> 6 * Gerald Baeza <gerald.baeza@foss.st.com> 7 * Erwan Le Ray <erwan.leray@foss.st.com> 8 * --- 536 unchanged lines hidden (view full) --- 545 stm32_usart_transmit_chars_pio(port); 546} 547 548static void stm32_usart_transmit_chars(struct uart_port *port) 549{ 550 struct stm32_port *stm32_port = to_stm32_port(port); 551 const struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; 552 struct circ_buf *xmit = &port->state->xmit; |
| 553 u32 isr; 554 int ret; |
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| 553 554 if (port->x_char) { 555 if (stm32_usart_tx_dma_started(stm32_port) && 556 stm32_usart_tx_dma_enabled(stm32_port)) 557 stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT); | 555 556 if (port->x_char) { 557 if (stm32_usart_tx_dma_started(stm32_port) && 558 stm32_usart_tx_dma_enabled(stm32_port)) 559 stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT); |
| 560 561 /* Check that TDR is empty before filling FIFO */ 562 ret = 563 readl_relaxed_poll_timeout_atomic(port->membase + ofs->isr, 564 isr, 565 (isr & USART_SR_TXE), 566 10, 1000); 567 if (ret) 568 dev_warn(port->dev, "1 character may be erased\n"); 569 |
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| 558 writel_relaxed(port->x_char, port->membase + ofs->tdr); 559 port->x_char = 0; 560 port->icount.tx++; 561 if (stm32_usart_tx_dma_started(stm32_port)) 562 stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT); 563 return; 564 } 565 --- 1327 unchanged lines hidden --- | 570 writel_relaxed(port->x_char, port->membase + ofs->tdr); 571 port->x_char = 0; 572 port->icount.tx++; 573 if (stm32_usart_tx_dma_started(stm32_port)) 574 stm32_usart_set_bits(port, ofs->cr3, USART_CR3_DMAT); 575 return; 576 } 577 --- 1327 unchanged lines hidden --- |