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Tue, 21 Jul 2026 20:47:52 -0700 (PDT) From: kr494167@gmail.com To: hansg@kernel.org, ilpo.jarvinen@linux.intel.com, jackbb_wu@compal.com Cc: W_Armin@gmx.de, superm1@kernel.org, platform-driver-x86@vger.kernel.org, linux-kernel@vger.kernel.org, surendra Subject: [PATCH] platform/x86: dell-dw5826e: fix ACPI _DSM function index and bitmask usage Date: Wed, 22 Jul 2026 09:17:43 +0530 Message-ID: <20260722034743.13565-1-kr494167@gmail.com> X-Mailer: git-send-email 2.55.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: surendra PALC_DSM_FN_TRIGGER_PLDR was defined as BIT(1) (value 2). acpi_evaluate_dsm() expects a 0-based function index integer (0, 1, 2, ...), whereas acpi_check_dsm() expects a bitmask of supported function indices (BIT(1), BIT(2), ...). Because PALC_DSM_FN_TRIGGER_PLDR was defined as BIT(1), acpi_evaluate_dsm() was evaluating Function Index 2 instead of Function Index 1, while acpi_check_dsm() was checking for Function Index 1 support. Fix this by setting PALC_DSM_FN_TRIGGER_PLDR to 1 (the function index) and passing BIT(PALC_DSM_FN_TRIGGER_PLDR) to acpi_check_dsm(). Fixes: 1ab843135a77 ("platform/x86: dell-dw5826e: Add reset driver for DW58= 26e") Signed-off-by: surendra --- drivers/platform/x86/dell/dell-dw5826e-reset.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/platform/x86/dell/dell-dw5826e-reset.c b/drivers/platf= orm/x86/dell/dell-dw5826e-reset.c index 1ca7c3421bb5..64e6e9b1d7a0 100644 --- a/drivers/platform/x86/dell/dell-dw5826e-reset.c +++ b/drivers/platform/x86/dell/dell-dw5826e-reset.c @@ -13,7 +13,7 @@ #include #include =20 -#define PALC_DSM_FN_TRIGGER_PLDR BIT(1) +#define PALC_DSM_FN_TRIGGER_PLDR 1 =20 static guid_t palc_dsm_guid =3D GUID_INIT(0x5a1a4bba, 0x8006, 0x487e, 0xbe, 0x0a, 0xac, 0xf5, 0xd8, 0xfd,= 0xfe, 0x59); @@ -66,7 +66,7 @@ static int palc_probe(struct platform_device *pdev) if (!handle) return -ENODEV; =20 - if (!acpi_check_dsm(handle, &palc_dsm_guid, 1, PALC_DSM_FN_TRIGGER_PLDR)) + if (!acpi_check_dsm(handle, &palc_dsm_guid, 1, BIT(PALC_DSM_FN_TRIGGER_PL= DR))) return -ENODEV; =20 return 0; --=20 2.55.0