diff mbox series

[thermal:,thermal/next] thermal/drivers/k3_j72xx_bandgap: Map fuse_base only for erratum workaround

Message ID 167059958655.4906.3773019382136161143.tip-bot2@tip-bot2
State New
Headers show
Series [thermal:,thermal/next] thermal/drivers/k3_j72xx_bandgap: Map fuse_base only for erratum workaround | expand

Commit Message

thermal-bot for Lad Prabhakar Dec. 9, 2022, 3:26 p.m. UTC 
The following commit has been merged into the thermal/next branch of thermal:

Commit-ID:     d73b040d88e2ca47746e6b2f7b0c432981a88ee7
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/thermal/linux.git//d73b040d88e2ca47746e6b2f7b0c432981a88ee7
Author:        Bryan Brattlof <bb@ti.com>
AuthorDate:    Mon, 31 Oct 2022 18:26:55 -05:00
Committer:     Daniel Lezcano <daniel.lezcano@kernel.org>
CommitterDate: Thu, 08 Dec 2022 14:30:44 +01:00

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>
---
 drivers/thermal/k3_j72xx_bandgap.c | 34 ++++++++++++++++++-----------
 1 file changed, 22 insertions(+), 12 deletions(-)
diff mbox series

Patch

diff --git a/drivers/thermal/k3_j72xx_bandgap.c b/drivers/thermal/k3_j72xx_bandgap.c
index 395a73c..031ea10 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