linux-kernel - Re: [RFC PATCH] drm/i915: Don't touch PORT_HOTPLUG_EN in intel_dp

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Message-ID: <20100408093535.691d5846@virtuousgeek.org>
Date:	Thu, 8 Apr 2010 09:35:35 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Karsten Wiese <fzuuzf@...glemail.com>
Cc:	linux-kernel@...r.kernel.org, Eric Anholt <eric@...olt.net>
Subject: Re: [RFC PATCH] drm/i915: Don't touch PORT_HOTPLUG_EN in
 intel_dp_detect()

On Sat, 27 Mar 2010 22:48:33 +0100
Karsten Wiese <fzuuzf@...glemail.com> wrote:

> PORT_HOTPLUG_EN has allready been setup in i915_driver_irq_postinstall(),
> when intel_dp_detect() runs.
> 
> Delete the DP[BCD]_HOTPLUG_INT_EN defines, they are not referenced anymore.
> 
> I found this while searching for a fix for
>         https://bugzilla.redhat.com/show_bug.cgi?id=528312
> 
> Signed-off-by: Karsten Wiese <fzu@...gehoertderstaat.de>
> ---
> See also 
> "drm/i915: only enable hotplug for detected outputs"
> b01f2c3a4a37d09a47ad73ccbb46d554d21cfeb0
> 
>  drivers/gpu/drm/i915/i915_reg.h |    3 ---
>  drivers/gpu/drm/i915/intel_dp.c |   10 ----------
>  2 files changed, 0 insertions(+), 13 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index ab1bd2d..92f440d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -854,11 +854,8 @@
>  /* Hotplug control (945+ only) */
>  #define PORT_HOTPLUG_EN                0x61110
>  #define   HDMIB_HOTPLUG_INT_EN                 (1 << 29)
> -#define   DPB_HOTPLUG_INT_EN                   (1 << 29)
>  #define   HDMIC_HOTPLUG_INT_EN                 (1 << 28)
> -#define   DPC_HOTPLUG_INT_EN                   (1 << 28)
>  #define   HDMID_HOTPLUG_INT_EN                 (1 << 27)
> -#define   DPD_HOTPLUG_INT_EN                   (1 << 27)
>  #define   SDVOB_HOTPLUG_INT_EN                 (1 << 26)
>  #define   SDVOC_HOTPLUG_INT_EN                 (1 << 25)
>  #define   TV_HOTPLUG_INT_EN                    (1 << 18)
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 439506c..7a3b5c8 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -1179,16 +1179,6 @@ intel_dp_detect(struct drm_connector *connector)
>         if (IS_IRONLAKE(dev))
>                 return ironlake_dp_detect(connector);
> 
> -       temp = I915_READ(PORT_HOTPLUG_EN);
> -
> -       I915_WRITE(PORT_HOTPLUG_EN,
> -              temp |
> -              DPB_HOTPLUG_INT_EN |
> -              DPC_HOTPLUG_INT_EN |
> -              DPD_HOTPLUG_INT_EN);
> -
> -       POSTING_READ(PORT_HOTPLUG_EN);
> -
>         switch (dp_priv->output_reg) {
>         case DP_B:
>                 bit = DPB_HOTPLUG_INT_STATUS;
> --
> 

Yeah, looks like we already cover this with the hotplug_supported_mask
setup we do here, so we should be able to drop these bits.

So assuming it's been tested with a real DP output + hotplug:

Reviewed-by: Jesse Barnes <jbarnes@...tuousgeek.org>

-- 
Jesse Barnes, Intel Open Source Technology Center
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