linux-kernel - Re: [PATCH] drm/radeon: Unbreak HPD handling for r600+

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Date:   Fri, 12 May 2017 08:56:38 +0200
From:   Christian König <christian.koenig@....com>
To:     Lyude <lyude@...hat.com>, <amd-gfx@...ts.freedesktop.org>
CC:     <stable@...r.kernel.org>, Alex Deucher <alexander.deucher@....com>,
        David Airlie <airlied@...ux.ie>,
        <dri-devel@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: Unbreak HPD handling for r600+

Am 12.05.2017 um 01:31 schrieb Lyude:
> We end up reading the interrupt register for HPD5, and then writing it
> to HPD6 which on systems without anything using HPD5 results in
> permanently disabling hotplug on one of the display outputs after the
> first time we acknowledge a hotplug interrupt from the GPU.
>
> This code is really bad. But for now, let's just fix this. I will
> hopefully have a large patch series to refactor all of this soon.
>
> Signed-off-by: Lyude <lyude@...hat.com>
> Cc: stable@...r.kernel.org

Really nice catch! And yes I agree the copy&pasted code in HPD handling 
always scared me as well.

Patch is Reviewed-by: Christian König <christian.koenig@....com>.

Christian.

> ---
>   drivers/gpu/drm/radeon/cik.c       | 4 ++--
>   drivers/gpu/drm/radeon/evergreen.c | 4 ++--
>   drivers/gpu/drm/radeon/r600.c      | 2 +-
>   drivers/gpu/drm/radeon/si.c        | 4 ++--
>   4 files changed, 7 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/gpu/drm/radeon/cik.c b/drivers/gpu/drm/radeon/cik.c
> index 53710dd..cfc917c 100644
> --- a/drivers/gpu/drm/radeon/cik.c
> +++ b/drivers/gpu/drm/radeon/cik.c
> @@ -7401,7 +7401,7 @@ static inline void cik_irq_ack(struct radeon_device *rdev)
>   		WREG32(DC_HPD5_INT_CONTROL, tmp);
>   	}
>   	if (rdev->irq.stat_regs.cik.disp_int_cont5 & DC_HPD6_INTERRUPT) {
> -		tmp = RREG32(DC_HPD5_INT_CONTROL);
> +		tmp = RREG32(DC_HPD6_INT_CONTROL);
>   		tmp |= DC_HPDx_INT_ACK;
>   		WREG32(DC_HPD6_INT_CONTROL, tmp);
>   	}
> @@ -7431,7 +7431,7 @@ static inline void cik_irq_ack(struct radeon_device *rdev)
>   		WREG32(DC_HPD5_INT_CONTROL, tmp);
>   	}
>   	if (rdev->irq.stat_regs.cik.disp_int_cont5 & DC_HPD6_RX_INTERRUPT) {
> -		tmp = RREG32(DC_HPD5_INT_CONTROL);
> +		tmp = RREG32(DC_HPD6_INT_CONTROL);
>   		tmp |= DC_HPDx_RX_INT_ACK;
>   		WREG32(DC_HPD6_INT_CONTROL, tmp);
>   	}
> diff --git a/drivers/gpu/drm/radeon/evergreen.c b/drivers/gpu/drm/radeon/evergreen.c
> index d1b1e0c..c48d19e 100644
> --- a/drivers/gpu/drm/radeon/evergreen.c
> +++ b/drivers/gpu/drm/radeon/evergreen.c
> @@ -4933,7 +4933,7 @@ static void evergreen_irq_ack(struct radeon_device *rdev)
>   		WREG32(DC_HPD5_INT_CONTROL, tmp);
>   	}
>   	if (rdev->irq.stat_regs.evergreen.disp_int_cont5 & DC_HPD6_INTERRUPT) {
> -		tmp = RREG32(DC_HPD5_INT_CONTROL);
> +		tmp = RREG32(DC_HPD6_INT_CONTROL);
>   		tmp |= DC_HPDx_INT_ACK;
>   		WREG32(DC_HPD6_INT_CONTROL, tmp);
>   	}
> @@ -4964,7 +4964,7 @@ static void evergreen_irq_ack(struct radeon_device *rdev)
>   		WREG32(DC_HPD5_INT_CONTROL, tmp);
>   	}
>   	if (rdev->irq.stat_regs.evergreen.disp_int_cont5 & DC_HPD6_RX_INTERRUPT) {
> -		tmp = RREG32(DC_HPD5_INT_CONTROL);
> +		tmp = RREG32(DC_HPD6_INT_CONTROL);
>   		tmp |= DC_HPDx_RX_INT_ACK;
>   		WREG32(DC_HPD6_INT_CONTROL, tmp);
>   	}
> diff --git a/drivers/gpu/drm/radeon/r600.c b/drivers/gpu/drm/radeon/r600.c
> index 0a08517..e06e2d8 100644
> --- a/drivers/gpu/drm/radeon/r600.c
> +++ b/drivers/gpu/drm/radeon/r600.c
> @@ -3988,7 +3988,7 @@ static void r600_irq_ack(struct radeon_device *rdev)
>   			WREG32(DC_HPD5_INT_CONTROL, tmp);
>   		}
>   		if (rdev->irq.stat_regs.r600.disp_int_cont2 & DC_HPD6_INTERRUPT) {
> -			tmp = RREG32(DC_HPD5_INT_CONTROL);
> +			tmp = RREG32(DC_HPD6_INT_CONTROL);
>   			tmp |= DC_HPDx_INT_ACK;
>   			WREG32(DC_HPD6_INT_CONTROL, tmp);
>   		}
> diff --git a/drivers/gpu/drm/radeon/si.c b/drivers/gpu/drm/radeon/si.c
> index 528e5a4..bfeb774 100644
> --- a/drivers/gpu/drm/radeon/si.c
> +++ b/drivers/gpu/drm/radeon/si.c
> @@ -6330,7 +6330,7 @@ static inline void si_irq_ack(struct radeon_device *rdev)
>   		WREG32(DC_HPD5_INT_CONTROL, tmp);
>   	}
>   	if (rdev->irq.stat_regs.evergreen.disp_int_cont5 & DC_HPD6_INTERRUPT) {
> -		tmp = RREG32(DC_HPD5_INT_CONTROL);
> +		tmp = RREG32(DC_HPD6_INT_CONTROL);
>   		tmp |= DC_HPDx_INT_ACK;
>   		WREG32(DC_HPD6_INT_CONTROL, tmp);
>   	}
> @@ -6361,7 +6361,7 @@ static inline void si_irq_ack(struct radeon_device *rdev)
>   		WREG32(DC_HPD5_INT_CONTROL, tmp);
>   	}
>   	if (rdev->irq.stat_regs.evergreen.disp_int_cont5 & DC_HPD6_RX_INTERRUPT) {
> -		tmp = RREG32(DC_HPD5_INT_CONTROL);
> +		tmp = RREG32(DC_HPD6_INT_CONTROL);
>   		tmp |= DC_HPDx_RX_INT_ACK;
>   		WREG32(DC_HPD6_INT_CONTROL, tmp);
>   	}