Commit 366444eb authored by Bryan Brattlof's avatar Bryan Brattlof Committed by Daniel Lezcano
Browse files

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: default avatarBryan Brattlof <bb@ti.com>
Link: https://lore.kernel.org/r/20221031232702.10339-5-bb@ti.com


Signed-off-by: default avatarDaniel Lezcano <daniel.lezcano@kernel.org>
parent 156f0e2f

drivers/thermal/k3_j72xx_bandgap.c

+22 −12
Original line number Diff line number Diff line
@@ -386,14 +386,31 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) 
	if (IS_ERR(bgp->cfg2_base))

		return PTR_ERR(bgp->cfg2_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);



	driver_data = of_device_get_match_data(dev);

	if (driver_data)

		workaround_needed = driver_data->has_errata_i2128;

		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);
@@ -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