[PATCH 01/11] drm/amdgpu/dce10: disable hpd on local panels

[Christian König]

Am 28.09.2016 um 20:26 schrieb Alex Deucher:
> Otherwise we can get a hotplug interrupt storm when
> we turn the panel off if hpd interrupts were enabled
> by the bios.
>
> bug:
> https://bugs.freedesktop.org/show_bug.cgi?id=97471
>
> Signed-off-by: Alex Deucher <alexander.deucher at amd.com>

For the whole set Reviewed-by: Christian König <christian.koenig at amd.com>

> Cc: stable at vger.kernel.org
> ---
>   drivers/gpu/drm/amd/amdgpu/dce_v10_0.c | 23 +++++++++++++----------
>   1 file changed, 13 insertions(+), 10 deletions(-)
>
> diff --git a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> index 9a63d77..55e346e 100644
> --- a/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> +++ b/drivers/gpu/drm/amd/amdgpu/dce_v10_0.c
> @@ -427,16 +427,6 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev)
>   	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
>   		struct amdgpu_connector *amdgpu_connector = to_amdgpu_connector(connector);
>   
> -		if (connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
> -		    connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
> -			/* don't try to enable hpd on eDP or LVDS avoid breaking the
> -			 * aux dp channel on imac and help (but not completely fix)
> -			 * https://bugzilla.redhat.com/show_bug.cgi?id=726143
> -			 * also avoid interrupt storms during dpms.
> -			 */
> -			continue;
> -		}
> -
>   		switch (amdgpu_connector->hpd.hpd) {
>   		case AMDGPU_HPD_1:
>   			idx = 0;
> @@ -460,6 +450,19 @@ static void dce_v10_0_hpd_init(struct amdgpu_device *adev)
>   			continue;
>   		}
>   
> +		if (connector->connector_type == DRM_MODE_CONNECTOR_eDP ||
> +		    connector->connector_type == DRM_MODE_CONNECTOR_LVDS) {
> +			/* don't try to enable hpd on eDP or LVDS avoid breaking the
> +			 * aux dp channel on imac and help (but not completely fix)
> +			 * https://bugzilla.redhat.com/show_bug.cgi?id=726143
> +			 * also avoid interrupt storms during dpms.
> +			 */
> +			tmp = RREG32(mmDC_HPD_INT_CONTROL + hpd_offsets[idx]);
> +			tmp = REG_SET_FIELD(tmp, DC_HPD_INT_CONTROL, DC_HPD_INT_EN, 0);
> +			WREG32(mmDC_HPD_INT_CONTROL + hpd_offsets[idx], tmp);
> +			continue;
> +		}
> +
>   		tmp = RREG32(mmDC_HPD_CONTROL + hpd_offsets[idx]);
>   		tmp = REG_SET_FIELD(tmp, DC_HPD_CONTROL, DC_HPD_EN, 1);
>   		WREG32(mmDC_HPD_CONTROL + hpd_offsets[idx], tmp);