Re: [PATCH V6 5/8] soundwire: amd: add SoundWire manager interrupt handling

From: Vinod Koul
Date: Wed Mar 15 2023 - 06:07:49 EST

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On 07-03-23, 19:01, Vijendar Mukunda wrote:
> Add support for handling SoundWire manager interrupts.
>
> Signed-off-by: Vijendar Mukunda <Vijendar.Mukunda@xxxxxxx>
> Signed-off-by: Mastan Katragadda <Mastan.Katragadda@xxxxxxx>
> Reviewed-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
> Link: https://lore.kernel.org/lkml/20230227154801.50319-6-Vijendar.Mukunda@xxxxxxx
> ---
> drivers/soundwire/amd_manager.c | 130 ++++++++++++++++++++++++++++++
> drivers/soundwire/amd_manager.h | 1 +
> include/linux/soundwire/sdw_amd.h | 7 ++
> 3 files changed, 138 insertions(+)
>
> diff --git a/drivers/soundwire/amd_manager.c b/drivers/soundwire/amd_manager.c
> index dd7fd4036d89..165078beca2e 100644
> --- a/drivers/soundwire/amd_manager.c
> +++ b/drivers/soundwire/amd_manager.c
> @@ -357,6 +357,51 @@ static enum sdw_command_response amd_sdw_xfer_msg(struct sdw_bus *bus, struct sd
> return SDW_CMD_OK;
> }
>
> +static void amd_sdw_fill_slave_status(struct amd_sdw_manager *amd_manager, u16 index, u32 status)
> +{
> + switch (status) {
> + case SDW_SLAVE_ATTACHED:
> + amd_manager->status[index] = SDW_SLAVE_ATTACHED;
> + break;
> + case SDW_SLAVE_UNATTACHED:
> + amd_manager->status[index] = SDW_SLAVE_UNATTACHED;
> + break;
> + case SDW_SLAVE_ALERT:
> + amd_manager->status[index] = SDW_SLAVE_ALERT;
> + break;

why not:

case SDW_SLAVE_ATTACHED:
case SDW_SLAVE_UNATTACHED:
case SDW_SLAVE_ALERT:
amd_manager->status[index] = status;
break;

> + default:
> + amd_manager->status[index] = SDW_SLAVE_RESERVED;
> + break;
> + }
> +}
> +
> +static void amd_sdw_process_ping_status(u64 response, struct amd_sdw_manager *amd_manager)
> +{
> + u64 slave_stat;
> + u32 val;
> + u16 dev_index;
> +
> + /* slave status response */
> + slave_stat = FIELD_GET(AMD_SDW_MCP_SLAVE_STAT_0_3, response);
> + slave_stat |= FIELD_GET(AMD_SDW_MCP_SLAVE_STAT_4_11, response) << 8;
> + dev_dbg(amd_manager->dev, "slave_stat:0x%llx\n", slave_stat);
> + for (dev_index = 0; dev_index <= SDW_MAX_DEVICES; ++dev_index) {
> + val = (slave_stat >> (dev_index * 2)) & AMD_SDW_MCP_SLAVE_STATUS_MASK;
> + dev_dbg(amd_manager->dev, "val:0x%x\n", val);
> + amd_sdw_fill_slave_status(amd_manager, dev_index, val);
> + }
> +}
> +
> +static void amd_sdw_read_and_process_ping_status(struct amd_sdw_manager *amd_manager)
> +{
> + u64 response;
> +
> + mutex_lock(&amd_manager->bus.msg_lock);
> + response = amd_sdw_send_cmd_get_resp(amd_manager, 0, 0);
> + mutex_unlock(&amd_manager->bus.msg_lock);
> + amd_sdw_process_ping_status(response, amd_manager);
> +}
> +
> static u32 amd_sdw_read_ping_status(struct sdw_bus *bus)
> {
> struct amd_sdw_manager *amd_manager = to_amd_sdw(bus);
> @@ -757,6 +802,89 @@ static int amd_sdw_register_dais(struct amd_sdw_manager *amd_manager)
> dais, num_dais);
> }
>
> +static void amd_sdw_update_slave_status_work(struct work_struct *work)
> +{
> + struct amd_sdw_manager *amd_manager =
> + container_of(work, struct amd_sdw_manager, amd_sdw_work);
> + int retry_count = 0;
> +
> + if (amd_manager->status[0] == SDW_SLAVE_ATTACHED) {
> + acp_reg_writel(0, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_MASK_0TO7);
> + acp_reg_writel(0, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_MASK_8TO11);
> + }
> +
> +update_status:
> + sdw_handle_slave_status(&amd_manager->bus, amd_manager->status);
> + /*
> + * During the peripheral enumeration sequence, the SoundWire manager interrupts
> + * are masked. Once the device number programming is done for all peripherals,
> + * interrupts will be unmasked. Read the peripheral device status from ping command
> + * and process the response. This sequence will ensure all peripheral devices enumerated
> + * and initialized properly.
> + */
> + if (amd_manager->status[0] == SDW_SLAVE_ATTACHED) {
> + if (retry_count++ < SDW_MAX_DEVICES) {
> + acp_reg_writel(AMD_SDW_IRQ_MASK_0TO7, amd_manager->mmio +
> + ACP_SW_STATE_CHANGE_STATUS_MASK_0TO7);
> + acp_reg_writel(AMD_SDW_IRQ_MASK_8TO11,
> + amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_MASK_8TO11);
> + amd_sdw_read_and_process_ping_status(amd_manager);
> + goto update_status;

goto are mostly used for error handling, i dont thing case here deserves
a goto, can you please change this...

> + } else {
> + dev_err_ratelimited(amd_manager->dev,
> + "Device0 detected after %d iterations\n",
> + retry_count);
> + }
> + }
> +}
> +
> +static void amd_sdw_update_slave_status(u32 status_change_0to7, u32 status_change_8to11,
> + struct amd_sdw_manager *amd_manager)
> +{
> + u64 slave_stat;
> + u32 val;
> + int dev_index;
> +
> + if (status_change_0to7 == AMD_SDW_SLAVE_0_ATTACHED)
> + memset(amd_manager->status, 0, sizeof(amd_manager->status));
> + slave_stat = status_change_0to7;
> + slave_stat |= FIELD_GET(AMD_SDW_MCP_SLAVE_STATUS_8TO_11, status_change_8to11) << 32;
> + dev_dbg(amd_manager->dev, "status_change_0to7:0x%x status_change_8to11:0x%x\n",
> + status_change_0to7, status_change_8to11);
> + if (slave_stat) {
> + for (dev_index = 0; dev_index <= SDW_MAX_DEVICES; ++dev_index) {
> + if (slave_stat & AMD_SDW_MCP_SLAVE_STATUS_VALID_MASK(dev_index)) {
> + val = (slave_stat >> AMD_SDW_MCP_SLAVE_STAT_SHIFT_MASK(dev_index)) &
> + AMD_SDW_MCP_SLAVE_STATUS_MASK;
> + amd_sdw_fill_slave_status(amd_manager, dev_index, val);
> + }
> + }
> + }
> +}
> +
> +static void amd_sdw_irq_thread(struct work_struct *work)
> +{
> + struct amd_sdw_manager *amd_manager =
> + container_of(work, struct amd_sdw_manager, amd_sdw_irq_thread);
> + u32 status_change_8to11;
> + u32 status_change_0to7;
> +
> + status_change_8to11 = acp_reg_readl(amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_8TO11);
> + status_change_0to7 = acp_reg_readl(amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_0TO7);
> + dev_dbg(amd_manager->dev, "[SDW%d] SDW INT: 0to7=0x%x, 8to11=0x%x\n",
> + amd_manager->instance, status_change_0to7, status_change_8to11);
> + if (status_change_8to11 & AMD_SDW_PREQ_INTR_STAT) {
> + amd_sdw_read_and_process_ping_status(amd_manager);
> + } else {
> + /* Check for the updated status on peripheral device */
> + amd_sdw_update_slave_status(status_change_0to7, status_change_8to11, amd_manager);
> + }
> + if (status_change_8to11 || status_change_0to7)
> + schedule_work(&amd_manager->amd_sdw_work);
> + acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_8TO11);
> + acp_reg_writel(0x00, amd_manager->mmio + ACP_SW_STATE_CHANGE_STATUS_0TO7);
> +}
> +
> static void amd_sdw_probe_work(struct work_struct *work)
> {
> struct amd_sdw_manager *amd_manager = container_of(work, struct amd_sdw_manager,
> @@ -847,6 +975,8 @@ static int amd_sdw_manager_probe(struct platform_device *pdev)
> return ret;
> }
> dev_set_drvdata(dev, amd_manager);
> + INIT_WORK(&amd_manager->amd_sdw_irq_thread, amd_sdw_irq_thread);
> + INIT_WORK(&amd_manager->amd_sdw_work, amd_sdw_update_slave_status_work);
> INIT_WORK(&amd_manager->probe_work, amd_sdw_probe_work);
> /*
> * Instead of having lengthy probe sequence, use deferred probe.
> diff --git a/drivers/soundwire/amd_manager.h b/drivers/soundwire/amd_manager.h
> index cad26034087b..807bc5a314d8 100644
> --- a/drivers/soundwire/amd_manager.h
> +++ b/drivers/soundwire/amd_manager.h
> @@ -185,6 +185,7 @@
> #define AMD_SDW1_PAD_KEEPER_EN_MASK 0x10
> #define AMD_SDW0_PAD_KEEPER_DISABLE_MASK 0x1E
> #define AMD_SDW1_PAD_KEEPER_DISABLE_MASK 0xF
> +#define AMD_SDW_PREQ_INTR_STAT BIT(19)
>
> enum amd_sdw_cmd_type {
> AMD_SDW_CMD_PING = 0,
> diff --git a/include/linux/soundwire/sdw_amd.h b/include/linux/soundwire/sdw_amd.h
> index ac537419301d..df60bc0de6fc 100644
> --- a/include/linux/soundwire/sdw_amd.h
> +++ b/include/linux/soundwire/sdw_amd.h
> @@ -45,8 +45,11 @@ struct sdw_amd_dai_runtime {
> * @mmio: SoundWire registers mmio base
> * @acp_mmio: acp registers mmio base
> * @reg_mask: register mask structure per manager instance
> + * @amd_sdw_irq_thread: SoundWire manager irq workqueue
> + * @amd_sdw_work: peripheral status work queue
> * @probe_work: SoundWire manager probe workqueue
> * @acp_sdw_lock: mutex to protect acp share register access
> + * @status: peripheral devices status array
> * @num_din_ports: number of input ports
> * @num_dout_ports: number of output ports
> * @cols_index: Column index in frame shape
> @@ -65,10 +68,14 @@ struct amd_sdw_manager {
> void __iomem *acp_mmio;
>
> struct sdw_manager_reg_mask *reg_mask;
> + struct work_struct amd_sdw_irq_thread;
> + struct work_struct amd_sdw_work;
> struct work_struct probe_work;
> /* mutex to protect acp common register access */
> struct mutex *acp_sdw_lock;
>
> + enum sdw_slave_status status[SDW_MAX_DEVICES + 1];
> +
> int num_din_ports;
> int num_dout_ports;
>
> --
> 2.34.1

--
~Vinod

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