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serial: 8250: create lsr_save_mask
Allow drivers to alter LSR save mask. Reviewed-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com> Link: https://lore.kernel.org/r/20220624204210.11112-3-ilpo.jarvinen@linux.intel.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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@ -138,7 +138,7 @@ static inline u16 serial_lsr_in(struct uart_8250_port *up)
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u16 lsr = up->lsr_saved_flags;
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u16 lsr = up->lsr_saved_flags;
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lsr |= serial_in(up, UART_LSR);
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lsr |= serial_in(up, UART_LSR);
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up->lsr_saved_flags = lsr & LSR_SAVE_FLAGS;
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up->lsr_saved_flags = lsr & up->lsr_save_mask;
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return lsr;
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return lsr;
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}
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}
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@ -1007,6 +1007,7 @@ int serial8250_register_8250_port(const struct uart_8250_port *up)
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uart->port.rs485 = up->port.rs485;
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uart->port.rs485 = up->port.rs485;
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uart->rs485_start_tx = up->rs485_start_tx;
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uart->rs485_start_tx = up->rs485_start_tx;
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uart->rs485_stop_tx = up->rs485_stop_tx;
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uart->rs485_stop_tx = up->rs485_stop_tx;
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uart->lsr_save_mask = up->lsr_save_mask;
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uart->dma = up->dma;
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uart->dma = up->dma;
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/* Take tx_loadsz from fifosize if it wasn't set separately */
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/* Take tx_loadsz from fifosize if it wasn't set separately */
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@ -1094,6 +1095,9 @@ int serial8250_register_8250_port(const struct uart_8250_port *up)
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ret = 0;
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ret = 0;
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}
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}
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if (!uart->lsr_save_mask)
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uart->lsr_save_mask = LSR_SAVE_FLAGS; /* Use default LSR mask */
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/* Initialise interrupt backoff work if required */
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/* Initialise interrupt backoff work if required */
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if (up->overrun_backoff_time_ms > 0) {
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if (up->overrun_backoff_time_ms > 0) {
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uart->overrun_backoff_time_ms =
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uart->overrun_backoff_time_ms =
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@ -129,7 +129,7 @@ static void dw8250_tx_wait_empty(struct uart_port *p)
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while (tries--) {
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while (tries--) {
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lsr = readb (p->membase + (UART_LSR << p->regshift));
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lsr = readb (p->membase + (UART_LSR << p->regshift));
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up->lsr_saved_flags |= lsr & LSR_SAVE_FLAGS;
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up->lsr_saved_flags |= lsr & up->lsr_save_mask;
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if (lsr & UART_LSR_TEMT)
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if (lsr & UART_LSR_TEMT)
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break;
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break;
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@ -120,6 +120,7 @@ struct uart_8250_port {
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*/
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*/
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#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
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#define LSR_SAVE_FLAGS UART_LSR_BRK_ERROR_BITS
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u16 lsr_saved_flags;
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u16 lsr_saved_flags;
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u16 lsr_save_mask;
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#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
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#define MSR_SAVE_FLAGS UART_MSR_ANY_DELTA
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unsigned char msr_saved_flags;
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unsigned char msr_saved_flags;
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