Tegra194 supports 4 SDO lines but GCAP register indicates 2 lines. Thus it does not reflect the true capability of the HW. This patch presents a workaround by updating NSDO value accordingly in T_AZA_DBG_CFG_2 register.
Signed-off-by: Sameer Pujar spujar@nvidia.com --- sound/pci/hda/hda_tegra.c | 33 +++++++++++++++++++++++++++++++++ 1 file changed, 33 insertions(+)
diff --git a/sound/pci/hda/hda_tegra.c b/sound/pci/hda/hda_tegra.c index 773992a..45dc544 100644 --- a/sound/pci/hda/hda_tegra.c +++ b/sound/pci/hda/hda_tegra.c @@ -52,10 +52,21 @@ #define HDA_IPFS_INTR_MASK 0x188 #define HDA_IPFS_EN_INTR (1 << 16)
+/* FPCI */ +#define FPCI_DBG_CFG_2 0x10F4 +#define FPCI_GCAP_NSDO_SHIFT 18 +#define FPCI_GCAP_NSDO_MASK (0x3 << FPCI_GCAP_NSDO_SHIFT) + /* max number of SDs */ #define NUM_CAPTURE_SD 1 #define NUM_PLAYBACK_SD 1
+/* + * Tegra194 does not reflect correct number of SDO lines. Below macro + * is used to update the GCAP register to workaround the issue. + */ +#define TEGRA194_NUM_SDO_LINES 4 + struct hda_tegra { struct azx chip; struct device *dev; @@ -275,6 +286,7 @@ static int hda_tegra_init_clk(struct hda_tegra *hda)
static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev) { + struct hda_tegra *hda = container_of(chip, struct hda_tegra, chip); struct hdac_bus *bus = azx_bus(chip); struct snd_card *card = chip->card; int err; @@ -298,6 +310,26 @@ static int hda_tegra_first_init(struct azx *chip, struct platform_device *pdev) bus->irq = irq_id; card->sync_irq = bus->irq;
+ /* + * Tegra194 has 4 SDO lines and the STRIPE can be used to + * indicate how many of the SDO lines the stream should be + * striped. But GCAP register does not reflect the true + * capability of HW. Below workaround helps to fix this. + * + * GCAP_NSDO is bits 19:18 in T_AZA_DBG_CFG_2, + * 0 for 1 SDO, 1 for 2 SDO, 2 for 4 SDO lines. + */ + if (of_device_is_compatible(np, "nvidia,tegra194-hda")) { + u32 val; + + dev_info(card->dev, "Override SDO lines to %u\n", + TEGRA194_NUM_SDO_LINES); + + val = readl(hda->regs + FPCI_DBG_CFG_2) & ~FPCI_GCAP_NSDO_MASK; + val |= (TEGRA194_NUM_SDO_LINES >> 1) << FPCI_GCAP_NSDO_SHIFT; + writel(val, hda->regs + FPCI_DBG_CFG_2); + } + gcap = azx_readw(chip, GCAP); dev_dbg(card->dev, "chipset global capabilities = 0x%x\n", gcap);
@@ -408,6 +440,7 @@ static int hda_tegra_create(struct snd_card *card,
static const struct of_device_id hda_tegra_match[] = { { .compatible = "nvidia,tegra30-hda" }, + { .compatible = "nvidia,tegra194-hda" }, {}, }; MODULE_DEVICE_TABLE(of, hda_tegra_match);