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Wysocki" , Daniel Lezcano , Amit Kucheria , Zhang Rui , Rob Herring , Krzysztof Kozlowski , Nishanth Menon , Vignesh Raghavendra , Tero Kristo CC: Keerthy , Linux PM , Device Trees , LKML , LKML ARM , Bryan Brattlof Subject: [PATCH v2 04/11] thermal: k3_j72xx_bandgap: map fuse_base only for erratum workaround Date: Tue, 25 Oct 2022 14:15:08 -0500 Message-ID: <20221025191515.9151-5-bb@ti.com> X-Mailer: git-send-email 2.38.1 In-Reply-To: <20221025191515.9151-1-bb@ti.com> References: <20221025191515.9151-1-bb@ti.com> MIME-Version: 1.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=2771; h=from:subject; bh=3VK0DERXGogo+qPJUQ5h+7vzk2QFXgKHa6rxgwtgdIs=; b=owNCWmg5MUFZJlNZ6Nc6iQAAa/////f7/3d8+/OyG7r9f5vvxznjfk/Mvv4t8T+dl9fb3+6wARsW DtRpo0ANAyADTTQaBk0yGgAZGgAGjQ0DTQyBk0NAA0aAwgMjQaDI0G9NJDoDR6mjQDTTQAPUA000AM mh6gAeoaA0D1DINMmQeiHqeoeoDamRoPUDQ0GgGTRoGhDI9TQ2pkyBoNGg2kAGmgyHqNAyaZAAA00N DQDCANAaNND1MgBkxMmjRoyGmQwABYCgyRiQCIB64UiEXChMVW2+fXIEakCUVAMxQecoPn2CJwFGGj IfT/2s63dGyAJMvVtyrBLWeA8bOkMAnub0rXkJGwblmtN4polTJkvwMKxWLlQFHk0XZV5ZbOATj8S6 3FKYhI+X1SgEXzIZbbCHv4M4clfTdDi6pm0R7Jap1nkbu0HA8o7n2SqEE+bSlekmarDYfcDIlJAbvX /QlgjZuncNNiITHz2YT07xjtBirwXPI4B4g8syrC1KhPCzyLA53n6R3RnYz6FeNcd8f2kAxGlbwIdk Al8VehXE3TcH+FNiRKGYI4/VYsu/2D8GGuP6v23keI6fFJ+nm1JrM2XdNv3KgC5FFVjjYMOebIxIr7 nRNiI7DAUkJHB03AonRBF6xw3RfhVA7k2XPNgA6fAW4An1NoMLyLgjCZ6wZ3gUDSnSf4u5IpwoSHRr nUSA X-Developer-Key: i=bb@ti.com; a=openpgp; fpr=D3D177E40A38DF4D1853FEEF41B90D5D71D56CE0 X-EXCLAIMER-MD-CONFIG: e1e8a2fd-e40a-4ac6-ac9b-f7e9cc9ee180 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221025_121528_981611_307C17F7 X-CRM114-Status: GOOD ( 16.72 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org 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 --- drivers/thermal/k3_j72xx_bandgap.c | 37 ++++++++++++++++++------------ 1 file changed, 22 insertions(+), 15 deletions(-) diff --git a/drivers/thermal/k3_j72xx_bandgap.c b/drivers/thermal/k3_j72xx_bandgap.c index 71bf65e6afaed..031ea1091909a 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 @@ -501,9 +511,6 @@ static int k3_j72xx_bandgap_probe(struct platform_device *pdev) */ kfree(ref_table); - if (workaround_needed) - devm_iounmap(dev, fuse_base); - return 0; err_free_ref_table: