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authorPeter Wu <peter@lekensteyn.nl>2016-05-24 17:32:23 +0200
committerPeter Wu <peter@lekensteyn.nl>2016-07-15 13:48:45 +0200
commit8035689e28a0bc6806e74df142ee6ce403e12663 (patch)
tree9dc81a9b2dfd3871a0b678cbcd5d4d5d631fd375
parent4c2e07c6a29e0129e975727b9f57eede813eea85 (diff)
downloadlinux-8035689e28a0bc6806e74df142ee6ce403e12663.tar.gz
drm/nouveau/acpi: ensure matching ACPI handle and supported functions
Ensure that the returned set of supported DSM functions (MUX, Optimus) match the ACPI handle that is set in nouveau_dsm_pci_probe. As there are no machines with a MUX function on just one PCI device and an Optimus on another, there should not be a functional impact. This change however makes this implicit assumption more obvious. Convert int to bool and rename has_dsm to has_mux while at it. Let the caller set nouveau_dsm_priv.dhandle as needed. v2: pass dhandle to the caller. Reviewed-by: Hans de Goede <hdegoede@redhat.com> Signed-off-by: Peter Wu <peter@lekensteyn.nl>
-rw-r--r--drivers/gpu/drm/nouveau/nouveau_acpi.c58
1 files changed, 26 insertions, 32 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_acpi.c b/drivers/gpu/drm/nouveau/nouveau_acpi.c
index db76b94e6e26..886a67c18a6c 100644
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -57,9 +57,6 @@ bool nouveau_is_v1_dsm(void) {
return nouveau_dsm_priv.dsm_detected;
}
-#define NOUVEAU_DSM_HAS_MUX 0x1
-#define NOUVEAU_DSM_HAS_OPT 0x2
-
#ifdef CONFIG_VGA_SWITCHEROO
static const char nouveau_dsm_muid[] = {
0xA0, 0xA0, 0x95, 0x9D, 0x60, 0x00, 0x48, 0x4D,
@@ -212,26 +209,33 @@ static const struct vga_switcheroo_handler nouveau_dsm_handler = {
.get_client_id = nouveau_dsm_get_client_id,
};
-static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
+static void nouveau_dsm_pci_probe(struct pci_dev *pdev, acpi_handle *dhandle_out,
+ bool *has_mux, bool *has_opt)
{
acpi_handle dhandle;
- int retval = 0;
+ bool supports_mux;
+ bool supports_opt;
dhandle = ACPI_HANDLE(&pdev->dev);
if (!dhandle)
- return false;
+ return;
if (!acpi_has_method(dhandle, "_DSM"))
- return false;
+ return;
- if (acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
- 1 << NOUVEAU_DSM_POWER))
- retval |= NOUVEAU_DSM_HAS_MUX;
+ supports_mux = acpi_check_dsm(dhandle, nouveau_dsm_muid, 0x00000102,
+ 1 << NOUVEAU_DSM_POWER);
+ supports_opt = nouveau_check_optimus_dsm(dhandle);
- if (nouveau_check_optimus_dsm(dhandle))
- retval |= NOUVEAU_DSM_HAS_OPT;
+ /* Does not look like a Nvidia device. */
+ if (!supports_mux && !supports_opt)
+ return;
- if (retval & NOUVEAU_DSM_HAS_OPT) {
+ *dhandle_out = dhandle;
+ *has_mux = supports_mux;
+ *has_opt = supports_opt;
+
+ if (supports_opt) {
uint32_t result;
nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
&result);
@@ -240,10 +244,6 @@ static int nouveau_dsm_pci_probe(struct pci_dev *pdev)
(result & OPTIMUS_DYNAMIC_PWR_CAP) ? "dynamic power, " : "",
(result & OPTIMUS_HDA_CODEC_MASK) ? "hda bios codec supported" : "");
}
- if (retval)
- nouveau_dsm_priv.dhandle = dhandle;
-
- return retval;
}
static bool nouveau_dsm_detect(void)
@@ -251,11 +251,11 @@ static bool nouveau_dsm_detect(void)
char acpi_method_name[255] = { 0 };
struct acpi_buffer buffer = {sizeof(acpi_method_name), acpi_method_name};
struct pci_dev *pdev = NULL;
- int has_dsm = 0;
- int has_optimus = 0;
+ acpi_handle dhandle = NULL;
+ bool has_mux = false;
+ bool has_optimus = false;
int vga_count = 0;
bool guid_valid;
- int retval;
bool ret = false;
/* lookup the MXM GUID */
@@ -268,32 +268,26 @@ static bool nouveau_dsm_detect(void)
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_VGA << 8, pdev)) != NULL) {
vga_count++;
- retval = nouveau_dsm_pci_probe(pdev);
- if (retval & NOUVEAU_DSM_HAS_MUX)
- has_dsm |= 1;
- if (retval & NOUVEAU_DSM_HAS_OPT)
- has_optimus = 1;
+ nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus);
}
while ((pdev = pci_get_class(PCI_CLASS_DISPLAY_3D << 8, pdev)) != NULL) {
vga_count++;
- retval = nouveau_dsm_pci_probe(pdev);
- if (retval & NOUVEAU_DSM_HAS_MUX)
- has_dsm |= 1;
- if (retval & NOUVEAU_DSM_HAS_OPT)
- has_optimus = 1;
+ nouveau_dsm_pci_probe(pdev, &dhandle, &has_mux, &has_optimus);
}
/* find the optimus DSM or the old v1 DSM */
- if (has_optimus == 1) {
+ if (has_optimus) {
+ nouveau_dsm_priv.dhandle = dhandle;
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
&buffer);
printk(KERN_INFO "VGA switcheroo: detected Optimus DSM method %s handle\n",
acpi_method_name);
nouveau_dsm_priv.optimus_detected = true;
ret = true;
- } else if (vga_count == 2 && has_dsm && guid_valid) {
+ } else if (vga_count == 2 && has_mux && guid_valid) {
+ nouveau_dsm_priv.dhandle = dhandle;
acpi_get_name(nouveau_dsm_priv.dhandle, ACPI_FULL_PATHNAME,
&buffer);
printk(KERN_INFO "VGA switcheroo: detected DSM switching method %s handle\n",