From: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com
Enabling MSI on HDA can fail, in which case the legacy PCI IRQ mode will be used. To make testing this mode easier add an "enable_msi" module parameter, which is only enabled if debugging is enabled too.
Signed-off-by: Guennadi Liakhovetski guennadi.liakhovetski@linux.intel.com Signed-off-by: Pierre-Louis Bossart pierre-louis.bossart@linux.intel.com --- sound/soc/sof/intel/hda.c | 28 +++++++++++++++++----------- sound/soc/sof/sof-priv.h | 2 +- 2 files changed, 18 insertions(+), 12 deletions(-)
diff --git a/sound/soc/sof/intel/hda.c b/sound/soc/sof/intel/hda.c index 7f665392618f..79cce20666b6 100644 --- a/sound/soc/sof/intel/hda.c +++ b/sound/soc/sof/intel/hda.c @@ -46,6 +46,12 @@ struct hda_dsp_msg_code { const char *msg; };
+static bool hda_use_msi = IS_ENABLED(CONFIG_PCI); +#if IS_ENABLED(CONFIG_SND_SOC_SOF_DEBUG) +module_param_named(use_msi, hda_use_msi, bool, 0444); +MODULE_PARM_DESC(use_msi, "SOF HDA use PCI MSI mode"); +#endif + static const struct hda_dsp_msg_code hda_dsp_rom_msg[] = { {HDA_DSP_ROM_FW_MANIFEST_LOADED, "status: manifest loaded"}, {HDA_DSP_ROM_FW_FW_LOADED, "status: fw loaded"}, @@ -529,11 +535,18 @@ int hda_dsp_probe(struct snd_sof_dev *sdev) * register our IRQ * let's try to enable msi firstly * if it fails, use legacy interrupt mode - * TODO: support interrupt mode selection with kernel parameter - * support msi multiple vectors + * TODO: support msi multiple vectors */ - ret = pci_alloc_irq_vectors(pci, 1, 1, PCI_IRQ_MSI); - if (ret < 0) { + if (hda_use_msi && !pci_alloc_irq_vectors(pci, 1, 1, PCI_IRQ_MSI)) { + dev_info(sdev->dev, "use msi interrupt mode\n"); + hdev->irq = pci_irq_vector(pci, 0); + /* ipc irq number is the same of hda irq */ + sdev->ipc_irq = hdev->irq; + /* initialised to "false" by kzalloc() */ + sdev->msi_enabled = true; + } + + if (!sdev->msi_enabled) { dev_info(sdev->dev, "use legacy interrupt mode\n"); /* * in IO-APIC mode, hda->irq and ipc_irq are using the same @@ -541,13 +554,6 @@ int hda_dsp_probe(struct snd_sof_dev *sdev) */ hdev->irq = pci->irq; sdev->ipc_irq = pci->irq; - sdev->msi_enabled = 0; - } else { - dev_info(sdev->dev, "use msi interrupt mode\n"); - hdev->irq = pci_irq_vector(pci, 0); - /* ipc irq number is the same of hda irq */ - sdev->ipc_irq = hdev->irq; - sdev->msi_enabled = 1; }
dev_dbg(sdev->dev, "using HDA IRQ %d\n", hdev->irq); diff --git a/sound/soc/sof/sof-priv.h b/sound/soc/sof/sof-priv.h index b8c9274ccf42..983eadef4b30 100644 --- a/sound/soc/sof/sof-priv.h +++ b/sound/soc/sof/sof-priv.h @@ -435,7 +435,7 @@ struct snd_sof_dev { u32 dtrace_error; u32 dtrace_draining;
- u32 msi_enabled; + bool msi_enabled;
void *private; /* core does not touch this */ };