linux-kernel - Re: [Intel-gfx] [PATCH 3/5] drm/i915: In intel_dp_init, replace read of DPCD with intel_dp_get

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Message-ID: <20110726093846.58e2c9f1@jbarnes-desktop>
Date:	Tue, 26 Jul 2011 09:38:46 -0700
From:	Jesse Barnes <jbarnes@...tuousgeek.org>
To:	Keith Packard <keithp@...thp.com>
Cc:	Dave Airlie <airlied@...hat.com>, intel-gfx@...ts.freedesktop.org,
	linux-kernel@...r.kernel.org, dri-devel@...ts.freedesktop.org
Subject: Re: [Intel-gfx] [PATCH 3/5] drm/i915: In intel_dp_init, replace
 read of DPCD with intel_dp_get_dpcd

On Mon, 25 Jul 2011 23:36:32 -0700
Keith Packard <keithp@...thp.com> wrote:

> Eliminates an open-coded read and also gains the retry behaviour of
> intel_dp_get_dpcd, which seems like a good idea.
> 
> Signed-off-by: Keith Packard <keithp@...thp.com>
> ---
>  drivers/gpu/drm/i915/intel_dp.c |    8 +++-----
>  1 files changed, 3 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 41674e1..9f134d2 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -2015,7 +2015,7 @@ intel_dp_init(struct drm_device *dev, int output_reg)
>  
>  	/* Cache some DPCD data in the eDP case */
>  	if (is_edp(intel_dp)) {
> -		int ret;
> +		bool ret;
>  		u32 pp_on, pp_div;
>  
>  		pp_on = I915_READ(PCH_PP_ON_DELAYS);
> @@ -2028,11 +2028,9 @@ intel_dp_init(struct drm_device *dev, int output_reg)
>  		dev_priv->panel_t12 *= 100; /* t12 in 100ms units */
>  
>  		ironlake_edp_panel_vdd_on(intel_dp);
> -		ret = intel_dp_aux_native_read(intel_dp, DP_DPCD_REV,
> -					       intel_dp->dpcd,
> -					       sizeof(intel_dp->dpcd));
> +		ret = intel_dp_get_dpcd(intel_dp);
>  		ironlake_edp_panel_vdd_off(intel_dp);
> -		if (ret == sizeof(intel_dp->dpcd)) {
> +		if (ret) {
>  			if (intel_dp->dpcd[DP_DPCD_REV] >= 0x11)
>  				dev_priv->no_aux_handshake =
>  					intel_dp->dpcd[DP_MAX_DOWNSPREAD] &

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

Now we just have to enable fast link training in the eDP case (and
optionally when we know the DP monitor hasn't changed, just DPMS'd).

-- 
Jesse Barnes, Intel Open Source Technology Center
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