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drm/radeon/kms: add MSI module parameter

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Allow the user to override whether MSIs are enabled
or not on supported ASICs.  MSIs are disabled by default
on IGP chips as they tend not to work.  However certain
IGP chips only seem to work with MSIs enabled.

I suspect this is a chipset or bios issue, but I'm not sure
what the proper fix is.  This will at least make diagnosing
and working around the problem much easier.

See:
https://bugs.freedesktop.org/show_bug.cgi?id=37679

Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
Cc: stable@kernel.org
Signed-off-by: Dave Airlie <airlied@redhat.com>
This commit is contained in:
Alex Deucher 2011-11-01 14:20:30 -04:00 committed by Dave Airlie
parent 01e718ec19
commit a18cee15ed
3 changed files with 11 additions and 0 deletions
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1
drivers/gpu/drm/radeon/radeon.h
View file

@ -93,6 +93,7 @@ extern int radeon_audio;
extern int radeon_disp_priority;
extern int radeon_hw_i2c;
extern int radeon_pcie_gen2;
extern int radeon_msi;
/*
* Copy from radeon_drv.h so we don't have to include both and have conflicting

4
drivers/gpu/drm/radeon/radeon_drv.c
View file

@ -118,6 +118,7 @@ int radeon_audio = 0;
int radeon_disp_priority = 0;
int radeon_hw_i2c = 0;
int radeon_pcie_gen2 = 0;
int radeon_msi = -1;
MODULE_PARM_DESC(no_wb, "Disable AGP writeback for scratch registers");
module_param_named(no_wb, radeon_no_wb, int, 0444);
@ -164,6 +165,9 @@ module_param_named(hw_i2c, radeon_hw_i2c, int, 0444);
MODULE_PARM_DESC(pcie_gen2, "PCIE Gen2 mode (1 = enable)");
module_param_named(pcie_gen2, radeon_pcie_gen2, int, 0444);
MODULE_PARM_DESC(msi, "MSI support (1 = enable, 0 = disable, -1 = auto)");
module_param_named(msi, radeon_msi, int, 0444);
static int radeon_suspend(struct drm_device *dev, pm_message_t state)
{
drm_radeon_private_t *dev_priv = dev->dev_private;

6
drivers/gpu/drm/radeon/radeon_irq_kms.c
View file

@ -118,6 +118,12 @@ static bool radeon_msi_ok(struct radeon_device *rdev)
if (rdev->flags & RADEON_IS_AGP)
return false;
/* force MSI on */
if (radeon_msi == 1)
return true;
else if (radeon_msi == 0)
return false;
/* Quirks */
/* HP RS690 only seems to work with MSIs. */
if ((rdev->pdev->device == 0x791f) &&