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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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4
drivers/gpu/drm/radeon/radeon_drv.c
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@@ -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;