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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>
This commit is contained in:
Bryan Brattlof 2022-10-31 18:26:55 -05:00 committed by Daniel Lezcano
parent 156f0e2fda
commit 366444ebe7
1 changed files with 22 additions and 12 deletions
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34
drivers/thermal/k3_j72xx_bandgap.c
View File

@ -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