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The existing code uses one pair of interrupt handler/thread per link but at the hardware level the interrupt is shared. This works fine for legacy PCI interrupts, but leads to timeouts in MSI (Message-Signaled Interrupt) mode, likely due to edges being lost. This patch unifies interrupt handling for all links. The dedicated handler is removed since we use a common one for all shared interrupt sources, and the thread function takes care of dealing with interrupt sources. This partition follows the model used for the SOF IPC on HDaudio platforms, where similar timeout issues were noticed and doing all the interrupt handling/clearing in the thread improved reliability/stability. Validation results with 4 links active in parallel show a night-and-day improvement with no timeouts noticed even during stress tests. Latency and quality of service are not affected by the change - mostly because events on a SoundWire link are throttled by the bus frame rate (typically 8..48kHz). Signed-off-by: Bard Liao <yung-chuan.liao@linux.intel.com> Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@linux.intel.com> Link: https://lore.kernel.org/r/20200716150947.22119-8-yung-chuan.liao@linux.intel.com Signed-off-by: Vinod Koul <vkoul@kernel.org>
186 lines
4.8 KiB
C
186 lines
4.8 KiB
C
/* SPDX-License-Identifier: (GPL-2.0 OR BSD-3-Clause) */
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/* Copyright(c) 2015-17 Intel Corporation. */
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#include <sound/soc.h>
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#ifndef __SDW_CADENCE_H
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#define __SDW_CADENCE_H
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#define SDW_CADENCE_GSYNC_KHZ 4 /* 4 kHz */
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#define SDW_CADENCE_GSYNC_HZ (SDW_CADENCE_GSYNC_KHZ * 1000)
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/**
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* struct sdw_cdns_pdi: PDI (Physical Data Interface) instance
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*
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* @num: pdi number
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* @intel_alh_id: link identifier
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* @l_ch_num: low channel for PDI
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* @h_ch_num: high channel for PDI
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* @ch_count: total channel count for PDI
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* @dir: data direction
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* @type: stream type, PDM or PCM
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*/
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struct sdw_cdns_pdi {
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int num;
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int intel_alh_id;
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int l_ch_num;
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int h_ch_num;
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int ch_count;
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enum sdw_data_direction dir;
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enum sdw_stream_type type;
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};
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/**
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* struct sdw_cdns_streams: Cadence stream data structure
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*
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* @num_bd: number of bidirectional streams
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* @num_in: number of input streams
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* @num_out: number of output streams
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* @num_ch_bd: number of bidirectional stream channels
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* @num_ch_bd: number of input stream channels
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* @num_ch_bd: number of output stream channels
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* @num_pdi: total number of PDIs
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* @bd: bidirectional streams
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* @in: input streams
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* @out: output streams
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*/
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struct sdw_cdns_streams {
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unsigned int num_bd;
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unsigned int num_in;
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unsigned int num_out;
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unsigned int num_ch_bd;
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unsigned int num_ch_in;
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unsigned int num_ch_out;
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unsigned int num_pdi;
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struct sdw_cdns_pdi *bd;
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struct sdw_cdns_pdi *in;
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struct sdw_cdns_pdi *out;
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};
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/**
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* struct sdw_cdns_stream_config: stream configuration
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*
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* @pcm_bd: number of bidirectional PCM streams supported
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* @pcm_in: number of input PCM streams supported
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* @pcm_out: number of output PCM streams supported
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* @pdm_bd: number of bidirectional PDM streams supported
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* @pdm_in: number of input PDM streams supported
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* @pdm_out: number of output PDM streams supported
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*/
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struct sdw_cdns_stream_config {
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unsigned int pcm_bd;
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unsigned int pcm_in;
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unsigned int pcm_out;
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unsigned int pdm_bd;
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unsigned int pdm_in;
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unsigned int pdm_out;
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};
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/**
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* struct sdw_cdns_dma_data: Cadence DMA data
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*
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* @name: SoundWire stream name
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* @stream: stream runtime
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* @pdi: PDI used for this dai
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* @bus: Bus handle
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* @stream_type: Stream type
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* @link_id: Master link id
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*/
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struct sdw_cdns_dma_data {
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char *name;
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struct sdw_stream_runtime *stream;
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struct sdw_cdns_pdi *pdi;
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struct sdw_bus *bus;
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enum sdw_stream_type stream_type;
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int link_id;
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};
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/**
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* struct sdw_cdns - Cadence driver context
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* @dev: Linux device
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* @bus: Bus handle
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* @instance: instance number
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* @response_buf: SoundWire response buffer
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* @tx_complete: Tx completion
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* @defer: Defer pointer
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* @ports: Data ports
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* @num_ports: Total number of data ports
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* @pcm: PCM streams
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* @pdm: PDM streams
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* @registers: Cadence registers
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* @link_up: Link status
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* @msg_count: Messages sent on bus
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*/
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struct sdw_cdns {
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struct device *dev;
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struct sdw_bus bus;
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unsigned int instance;
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u32 response_buf[0x80];
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struct completion tx_complete;
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struct sdw_defer *defer;
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struct sdw_cdns_port *ports;
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int num_ports;
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struct sdw_cdns_streams pcm;
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struct sdw_cdns_streams pdm;
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void __iomem *registers;
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bool link_up;
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unsigned int msg_count;
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struct work_struct work;
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struct list_head list;
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};
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#define bus_to_cdns(_bus) container_of(_bus, struct sdw_cdns, bus)
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/* Exported symbols */
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int sdw_cdns_probe(struct sdw_cdns *cdns);
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extern struct sdw_master_ops sdw_cdns_master_ops;
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irqreturn_t sdw_cdns_irq(int irq, void *dev_id);
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irqreturn_t sdw_cdns_thread(int irq, void *dev_id);
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int sdw_cdns_init(struct sdw_cdns *cdns);
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int sdw_cdns_pdi_init(struct sdw_cdns *cdns,
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struct sdw_cdns_stream_config config);
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int sdw_cdns_exit_reset(struct sdw_cdns *cdns);
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int sdw_cdns_enable_interrupt(struct sdw_cdns *cdns, bool state);
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bool sdw_cdns_is_clock_stop(struct sdw_cdns *cdns);
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int sdw_cdns_clock_stop(struct sdw_cdns *cdns, bool block_wake);
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int sdw_cdns_clock_restart(struct sdw_cdns *cdns, bool bus_reset);
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#ifdef CONFIG_DEBUG_FS
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void sdw_cdns_debugfs_init(struct sdw_cdns *cdns, struct dentry *root);
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#endif
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struct sdw_cdns_pdi *sdw_cdns_alloc_pdi(struct sdw_cdns *cdns,
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struct sdw_cdns_streams *stream,
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u32 ch, u32 dir, int dai_id);
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void sdw_cdns_config_stream(struct sdw_cdns *cdns,
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u32 ch, u32 dir, struct sdw_cdns_pdi *pdi);
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enum sdw_command_response
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cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num);
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enum sdw_command_response
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cdns_xfer_msg(struct sdw_bus *bus, struct sdw_msg *msg);
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enum sdw_command_response
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cdns_xfer_msg_defer(struct sdw_bus *bus,
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struct sdw_msg *msg, struct sdw_defer *defer);
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enum sdw_command_response
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cdns_reset_page_addr(struct sdw_bus *bus, unsigned int dev_num);
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int cdns_bus_conf(struct sdw_bus *bus, struct sdw_bus_params *params);
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int cdns_set_sdw_stream(struct snd_soc_dai *dai,
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void *stream, bool pcm, int direction);
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#endif /* __SDW_CADENCE_H */
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