From: Guennadi Liakhovetski <guennadi.liakhovetski@xxxxxxxxxxxxxxx>
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@xxxxxxxxxxxxxxx>
Signed-off-by: Pierre-Louis Bossart <pierre-louis.bossart@xxxxxxxxxxxxxxx>
---
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 */
};
--
2.20.1
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