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Date: Mon, 14 Nov 2016 00:14:20 +0000
From: Ben Hutchings <ben@...adent.org.uk>
To: linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC: akpm@...ux-foundation.org, "Hans de Goede" <hdegoede@...hat.com>,
"Ben Skeggs" <bskeggs@...hat.com>,
"Peter Wu" <peter@...ensteyn.nl>, Dave@...adent.org.uk
Subject: [PATCH 3.16 131/346] drm/nouveau/acpi: ensure matching ACPI
handle and supported functions
3.16.39-rc1 review patch. If anyone has any objections, please let me know.
------------------
From: Peter Wu <peter@...ensteyn.nl>
commit df42194a9ac2678bf086c2c5372e125e742b0ee7 upstream.
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@...hat.com>
Signed-off-by: Peter Wu <peter@...ensteyn.nl>
Acked-by: Dave Airlie <airlied@...hat.com
Signed-off-by: Ben Skeggs <bskeggs@...hat.com>
[bwh: Backported to 3.16: adjust context]
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
drivers/gpu/drm/nouveau/nouveau_acpi.c | 58 +++++++++++++++-------------------
1 file changed, 26 insertions(+), 32 deletions(-)
--- a/drivers/gpu/drm/nouveau/nouveau_acpi.c
+++ b/drivers/gpu/drm/nouveau/nouveau_acpi.c
@@ -58,9 +58,6 @@ 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,
@@ -213,27 +210,34 @@ static struct vga_switcheroo_handler nou
.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")) {
nouveau_dsm_priv.other_handle = dhandle;
- 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);
+
+ /* Does not look like a Nvidia device. */
+ if (!supports_mux && !supports_opt)
+ return;
- if (nouveau_check_optimus_dsm(dhandle))
- retval |= NOUVEAU_DSM_HAS_OPT;
+ *dhandle_out = dhandle;
+ *has_mux = supports_mux;
+ *has_opt = supports_opt;
- if (retval & NOUVEAU_DSM_HAS_OPT) {
+ if (supports_opt) {
uint32_t result;
nouveau_optimus_dsm(dhandle, NOUVEAU_DSM_OPTIMUS_CAPS, 0,
&result);
@@ -242,10 +246,6 @@ static int nouveau_dsm_pci_probe(struct
(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)
@@ -253,11 +253,11 @@ 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 */
@@ -270,32 +270,26 @@ 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",
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