diff options
| author | Bryan Brattlof <bb@ti.com> | 2022-10-31 18:26:55 -0500 |
|---|---|---|
| committer | Daniel Lezcano <daniel.lezcano@kernel.org> | 2022-12-14 15:25:41 +0100 |
| commit | 366444ebe7e2e1c987c6a07551f06db4b5b7c0ad (patch) | |
| tree | 95e3cc8da1f8e4a7db48b4e9036a52a85326b81f /drivers/thermal | |
| parent | 156f0e2fda420c4a4a7b244a909df04086039bd6 (diff) | |
| download | linux-366444ebe7e2e1c987c6a07551f06db4b5b7c0ad.tar.bz2 | |
thermal/drivers/k3_j72xx_bandgap: Map fuse_base only for erratum workaround
Some of TI's J721E SoCs require a software trimming procedure for the
temperature monitors to function properly. To determine if a particular
J721E is not affected by this erratum, both bits in the WKUP_SPARE_FUSE0
region must be set. Other SoCs, not affected by this erratum, will not
need this region.
Map the 'fuse_base' region only when the erratum fix is needed.
Signed-off-by: Bryan Brattlof <bb@ti.com>
Link: https://lore.kernel.org/r/20221031232702.10339-5-bb@ti.com
Signed-off-by: Daniel Lezcano <daniel.lezcano@kernel.org>
Diffstat (limited to 'drivers/thermal')
| -rw-r--r-- | drivers/thermal/k3_j72xx_bandgap.c | 34 |
1 files changed, 22 insertions, 12 deletions
diff --git a/drivers/thermal/k3_j72xx_bandgap.c b/drivers/thermal/k3_j72xx_bandgap.c index 395a73cb3742..031ea1091909 100644 --- a/drivers/thermal/k3_j72xx_bandgap.c +++ b/drivers/thermal/k3_j72xx_bandgap.c @@ -386,15 +386,32 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) if (IS_ERR(bgp->cfg2_base)) return PTR_ERR(bgp->cfg2_base); - res = platform_get_resource(pdev, IORESOURCE_MEM, 2); - fuse_base = devm_ioremap_resource(dev, res); - if (IS_ERR(fuse_base)) - return PTR_ERR(fuse_base); - driver_data = of_device_get_match_data(dev); if (driver_data) workaround_needed = driver_data->has_errata_i2128; + /* + * Some of TI's J721E SoCs require a software trimming procedure + * for the temperature monitors to function properly. To determine + * if this particular SoC is NOT affected, both bits in the + * WKUP_SPARE_FUSE0[31:30] will be set (0xC0000000) indicating + * when software trimming should NOT be applied. + * + * https://www.ti.com/lit/er/sprz455c/sprz455c.pdf + */ + if (workaround_needed) { + res = platform_get_resource(pdev, IORESOURCE_MEM, 2); + fuse_base = devm_ioremap_resource(dev, res); + if (IS_ERR(fuse_base)) + return PTR_ERR(fuse_base); + + if ((readl(fuse_base) & 0xc0000000) == 0xc0000000) + workaround_needed = false; + } + + dev_dbg(bgp->dev, "Work around %sneeded\n", + workaround_needed ? "" : "not "); + pm_runtime_enable(dev); ret = pm_runtime_get_sync(dev); if (ret < 0) { @@ -427,13 +444,6 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) goto err_free_ref_table; } - /* Workaround not needed if bit30/bit31 is set even for J721e */ - if (workaround_needed && (readl(fuse_base + 0x0) & 0xc0000000) == 0xc0000000) - workaround_needed = false; - - dev_dbg(bgp->dev, "Work around %sneeded\n", - workaround_needed ? "" : "not "); - if (!workaround_needed) init_table(5, ref_table, golden_factors); else |