[PATCH v1 2/5] ALSA: hda/tegra: Reset hardware
From: Dmitry Osipenko <digetx@gmail.com>
Date: 2021-01-12 13:00:37
Also in:
alsa-devel, lkml
Subsystem:
sound, the rest · Maintainers:
Jaroslav Kysela, Takashi Iwai, Linus Torvalds
Reset hardware in order to bring it into a predictable state. Tested-by: Peter Geis <redacted> Tested-by: Nicolas Chauvet <redacted> Signed-off-by: Dmitry Osipenko <digetx@gmail.com> --- sound/pci/hda/hda_tegra.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+)
diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c
index 4c799661c2f6..e406b7980f31 100644
--- a/sound/pci/hda/hda_tegra.c
+++ b/sound/pci/hda/hda_tegra.c@@ -17,6 +17,7 @@ #include <linux/moduleparam.h> #include <linux/mutex.h> #include <linux/of_device.h> +#include <linux/reset.h> #include <linux/slab.h> #include <linux/time.h> #include <linux/string.h>
@@ -70,6 +71,7 @@ struct hda_tegra { struct azx chip; struct device *dev; + struct reset_control *reset; struct clk_bulk_data clocks[3]; unsigned int nclocks; void __iomem *regs;
@@ -167,6 +169,12 @@ static int __maybe_unused hda_tegra_runtime_resume(struct device *dev) struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); int rc; + if (!(chip && chip->running)) { + rc = reset_control_assert(hda->reset); + if (rc) + return rc; + } + rc = clk_bulk_prepare_enable(hda->nclocks, hda->clocks); if (rc != 0) return rc;
@@ -176,6 +184,10 @@ static int __maybe_unused hda_tegra_runtime_resume(struct device *dev) /* disable controller wake up event*/ azx_writew(chip, WAKEEN, azx_readw(chip, WAKEEN) & ~STATESTS_INT_MASK); + } else { + rc = reset_control_reset(hda->reset); + if (rc) + return rc; } return 0;
@@ -441,6 +453,12 @@ static int hda_tegra_probe(struct platform_device *pdev) return err; } + hda->reset = devm_reset_control_array_get_exclusive(&pdev->dev); + if (IS_ERR(hda->reset)) { + err = PTR_ERR(hda->reset); + goto out_free; + } + hda->clocks[hda->nclocks++].id = "hda"; hda->clocks[hda->nclocks++].id = "hda2hdmi"; hda->clocks[hda->nclocks++].id = "hda2codec_2x";
--
2.29.2