1 files changed, 24 insertions, 2 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index 4ef83df2b246..83face3f608f 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -106,6 +106,29 @@ static int nouveau_optimus_dsm(acpi_handle handle, int func, int arg, uint32_t *
         return 0;
 }
 
+/*
+ * On some platforms, _DSM(nouveau_op_dsm_muid, func0) has special
+ * requirements on the fourth parameter, so a private implementation
+ * instead of using acpi_check_dsm().
+ */
+static int nouveau_check_optimus_dsm(acpi_handle handle)
+{
+        int result;
+
+        /*
+         * Function 0 returns a Buffer containing available functions.
+         * The args parameter is ignored for function 0, so just put 0 in it
+         */
+        if (nouveau_optimus_dsm(handle, 0, 0, &result))
+                return 0;
+
+        /*
+         * ACPI Spec v4 9.14.1: if bit 0 is zero, no function is supported.
+         * If the n-th bit is enabled, function n is supported
+         */
+        return result & 1 && result & (1 << NOUVEAU_DSM_OPTIMUS_CAPS);
+}
+
 static int nouveau_dsm(acpi_handle handle, int func, int arg)
 {
         int ret = 0;
@@ -207,8 +230,7 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
                            1 << NOUVEAU_DSM_POWER))
                 retval |= NOUVEAU_DSM_HAS_MUX;
 
-        if (acpi_check_dsm(dhandle, nouveau_op_dsm_muid, 0x00000100,
-                           1 << NOUVEAU_DSM_OPTIMUS_CAPS))
+        if (nouveau_check_optimus_dsm(dhandle))
                 retval |= NOUVEAU_DSM_HAS_OPT;
 
         if (retval & NOUVEAU_DSM_HAS_OPT) {