/**************************************************************************** Copyright Echo Digital Audio Corporation (c) 1998 - 2004 All rights reserved www.echoaudio.com This file is part of Echo Digital Audio's generic driver library. Echo Digital Audio's generic driver library is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. ************************************************************************* Translation from C++ and adaptation for use in ALSA-Driver were made by Giuliano Pochini ****************************************************************************/ static int load_asic(struct echoaudio *chip); static int dsp_set_digital_mode(struct echoaudio *chip, u8 mode); static int set_digital_mode(struct echoaudio *chip, u8 mode); static int check_asic_status(struct echoaudio *chip); static int set_sample_rate(struct echoaudio *chip, u32 rate); static int set_input_clock(struct echoaudio *chip, u16 clock); static int set_professional_spdif(struct echoaudio *chip, char prof); static int set_phantom_power(struct echoaudio *chip, char on); static int write_control_reg(struct echoaudio *chip, u32 ctl, u32 frq, char force); #include static int init_hw(struct echoaudio *chip, u16 device_id, u16 subdevice_id) { int err; local_irq_enable(); if (snd_BUG_ON((subdevice_id & 0xfff0) != ECHO3G)) return -ENODEV; if ((err = init_dsp_comm_page(chip))) { dev_err(chip->card->dev, "init_hw - could not initialize DSP comm page\n"); return err; } chip->comm_page->e3g_frq_register = cpu_to_le32((E3G_MAGIC_NUMBER / 48000) - 2); chip->device_id = device_id; chip->subdevice_id = subdevice_id; chip->bad_board = true; chip->has_midi = true; chip->dsp_code_to_load = FW_ECHO3G_DSP; /* Load the DSP code and the ASIC on the PCI card and get what type of external box is attached */ err = load_firmware(chip); if (err < 0) { return err; } else if (err == E3G_GINA3G_BOX_TYPE) { chip->input_clock_types = ECHO_CLOCK_BIT_INTERNAL | ECHO_CLOCK_BIT_SPDIF | ECHO_CLOCK_BIT_ADAT; chip->card_name = "Gina3G"; chip->px_digital_out = chip->bx_digital_out = 6; chip->px_analog_in = chip->bx_analog_in = 14; chip->px_digital_in = chip->bx_digital_in = 16; chip->px_num = chip->bx_num = 24; chip->has_phantom_power = true; chip->hasnt_input_nominal_level = true; } else if (err == E3G_LAYLA3G_BOX_TYPE) { chip->input_clock_types = ECHO_CLOCK_BIT_INTERNAL | ECHO_CLOCK_BIT_SPDIF | ECHO_CLOCK_BIT_ADAT | ECHO_CLOCK_BIT_WORD; chip->card_name = "Layla3G"; chip->px_digital_out = chip->bx_digital_out = 8; chip->px_analog_in = chip->bx_analog_in = 16; chip->px_digital_in = chip->bx_digital_in = 24; chip->px_num = chip->bx_num = 32; } else { return -ENODEV; } chip->digital_modes = ECHOCAPS_HAS_DIGITAL_MODE_SPDIF_RCA | ECHOCAPS_HAS_DIGITAL_MODE_SPDIF_OPTICAL | ECHOCAPS_HAS_DIGITAL_MODE_ADAT; return err; } static int set_mixer_defaults(struct echoaudio *chip) { chip->digital_mode = DIGITAL_MODE_SPDIF_RCA; chip->professional_spdif = false; chip->non_audio_spdif = false; chip->bad_board = false; chip->phantom_power = false; return init_line_levels(chip); } static int set_phantom_power(struct echoaudio *chip, char on) { u32 control_reg = le32_to_cpu(chip->comm_page->control_register); if (on) control_reg |= E3G_PHANTOM_POWER; else control_reg &= ~E3G_PHANTOM_POWER; chip->phantom_power = on; return write_control_reg(chip, control_reg, le32_to_cpu(chip->comm_page->e3g_frq_register), 0); } ble summary='commit info' class='commit-info'> authorDaniel Jedrychowski <avistel@gmail.com>2016-12-12 09:18:28 +1100 committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-01-11 08:35:17 +0100 commit2bed8a8e70729f996af92042d3ad0f11870acc1f (patch) treebef2d20e174c126ea18ad33cb4f7c0a9790b08a2 /drivers parentc130b666a9a711f985a0a44b58699ebe14bb7245 (diff)
Clearing FIFOs in RS485 emulation mode causes subsequent transmits to break
When in RS485 emulation mode, __do_stop_tx_rs485() calls serial8250_clear_fifos(). This not only clears the FIFOs, but also sets all bits in their control register (UART_FCR) to 0. One of the effects of this is the disabling of the FIFOs, which turns them into single-byte holding registers. The rest of the driver doesn't know this, which results in the lions share of characters passed into a write call to be dropped. (I can supply logic analyzer screenshots if necessary) This fix replaces the serial8250_clear_fifos() call to serial8250_clear_and_reinit_fifos() - this prevents the "dropped characters" issue from manifesting again while retaining the requirement of clearing the RX FIFO after transmission if the SER_RS485_RX_DURING_TX flag is disabled. Signed-off-by: Daniel Jedrychowski <avistel@gmail.com> Cc: stable <stable@vger.kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')