linux-kernel - Re: [Intel-gfx] [PATCH] drm/i915: Return correct EDP voltage swing table for 0.85V

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Date:   Mon, 17 Jul 2017 12:21:20 -0700
From:   Manasi Navare <manasi.d.navare@...el.com>
To:     Matthias Kaehlcke <mka@...omium.org>
Cc:     Daniel Vetter <daniel@...ll.ch>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        David Airlie <airlied@...ux.ie>,
        Daniel Vetter <daniel.vetter@...el.com>,
        Grant Grundler <grundler@...omium.org>,
        intel-gfx <intel-gfx@...ts.freedesktop.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        dri-devel@...ts.freedesktop.org,
        Stéphane Marchesin 
        <stephane.marchesin@...il.com>
Subject: Re: [Intel-gfx] [PATCH] drm/i915: Return correct EDP voltage swing
 table for 0.85V

This makes sense, it should have returned the edp ddi buf translation
table as per the Bspec.
Please add this to the commit message:
Fixes: cf54ca8bc567 ("drm/i915/cnl: Implement voltage swing sequence.")

After that,
Reviewed-by: Manasi Navare <manasi.d.navare@...el.com>

Manasi

On Mon, Jul 17, 2017 at 11:21:27AM -0700, Matthias Kaehlcke wrote:
> For 0.85V cnl_get_buf_trans_edp() returns the DP table, instead of EDP.
> Use the correct table.
> 
> The error was pointed out by this clang warning:
> 
> drivers/gpu/drm/i915/intel_ddi.c:392:39: warning: variable
>   'cnl_ddi_translations_edp_0_85V' is not needed and will not be emitted
>   [-Wunneeded-internal-declaration]
>     static const struct cnl_ddi_buf_trans cnl_ddi_translations_edp_0_85V[] = {
> 
> Signed-off-by: Matthias Kaehlcke <mka@...omium.org>
> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c b/drivers/gpu/drm/i915/intel_ddi.c
> index efb13582dc73..6fa02e6a7a9b 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -1873,7 +1873,7 @@ cnl_get_buf_trans_edp(struct drm_i915_private *dev_priv,
>  	if (dev_priv->vbt.edp.low_vswing) {
>  		if (voltage == VOLTAGE_INFO_0_85V) {
>  			*n_entries = ARRAY_SIZE(cnl_ddi_translations_edp_0_85V);
> -			return cnl_ddi_translations_dp_0_85V;
> +			return cnl_ddi_translations_edp_0_85V;
>  		} else if (voltage == VOLTAGE_INFO_0_95V) {
>  			*n_entries = ARRAY_SIZE(cnl_ddi_translations_edp_0_95V);
>  			return cnl_ddi_translations_edp_0_95V;
> -- 
> 2.13.2.932.g7449e964c-goog
> 
> _______________________________________________
> Intel-gfx mailing list
> Intel-gfx@...ts.freedesktop.org
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx

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