On Tue, Nov 26, 2019 at 08:25:45AM +0100, Thomas Zimmermann wrote:
> For hardware that does not interpret the startadd field correctly,
> add the module parameter 'hw_bug_no_startadd', which enables the
> workaround.
>
> Signed-off-by: Thomas Zimmermann <tzimmerm...@suse.de>
> ---
> drivers/gpu/drm/mgag200/mgag200_drv.c | 8 ++++++++
> 1 file changed, 8 insertions(+)
>
> diff --git a/drivers/gpu/drm/mgag200/mgag200_drv.c
> b/drivers/gpu/drm/mgag200/mgag200_drv.c
> index d43951caeea0..79836b09a54a 100644
> --- a/drivers/gpu/drm/mgag200/mgag200_drv.c
> +++ b/drivers/gpu/drm/mgag200/mgag200_drv.c
> @@ -27,6 +27,10 @@ int mgag200_modeset = -1;
> MODULE_PARM_DESC(modeset, "Disable/Enable modesetting");
> module_param_named(modeset, mgag200_modeset, int, 0400);
>
> +int mgag200_hw_bug_no_startadd = -1;
> +MODULE_PARM_DESC(modeset, "HW does not interpret scanout-buffer start
> address correctly");
> +module_param_named(hw_bug_no_startadd, mgag200_hw_bug_no_startadd, int,
> 0400);
> +
> static struct drm_driver driver;
>
> static const struct pci_device_id pciidlist[] = {
> @@ -64,6 +68,10 @@ DEFINE_DRM_GEM_FOPS(mgag200_driver_fops);
>
> static bool mgag200_pin_bo_at_0(const struct mga_device *mdev)
> {
I'd add a infor printing if the module option is non-zero that people
should submit a bug report if this fixes their issue. We don't want people
fixing bugs with module options, stuff should work by default.
With that addressed:
Reviewed-by: Daniel Vetter <daniel.vet...@ffwll.ch>
> + if (!mgag200_hw_bug_no_startadd)
> + return false;
> + else if (mgag200_hw_bug_no_startadd > 0)
> + return true;
> return mdev->flags & MGAG200_FLAG_HW_BUG_NO_STARTADD;
> }
>
> --
> 2.23.0
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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