linux-kernel - Re: [PATCH] drm/radeon: remove unreachable code

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Date:	Tue, 20 Jan 2015 01:25:11 +0100
From:	Nicholas Mc Guire <der.herr@...r.at>
To:	"Deucher, Alexander" <Alexander.Deucher@....com>
Cc:	"Koenig, Christian" <Christian.Koenig@....com>,
	David Airlie <airlied@...ux.ie>,
	"dri-devel@...ts.freedesktop.org" <dri-devel@...ts.freedesktop.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] drm/radeon: remove unreachable code

On Mon, 19 Jan 2015, Deucher, Alexander wrote:

> > -----Original Message-----
> > From: Nicholas Mc Guire [mailto:der.herr@...r.at]
> > Sent: Monday, January 19, 2015 8:11 AM
> > To: Deucher, Alexander
> > Cc: Koenig, Christian; David Airlie; dri-devel@...ts.freedesktop.org; linux-
> > kernel@...r.kernel.org; Nicholas Mc Guire
> > Subject: [PATCH] drm/radeon: remove unreachable code
> > 
> > Signed-off-by: Nicholas Mc Guire <der.herr@...r.at>
> 
> NACK.  I want to leave this in place for the future.  When we support dynamically adjusting the disp clock we'll need to update the sclk for ds mode.
>

get it - then could you add some comment to that end so it becomes clear 
that this is intentional - using your comment above - something like:

 
>From 2be978edbc77d5928ede8fddc2d784ca6f78533e Mon Sep 17 00:00:00 2001
From: Nicholas Mc Guire <der.herr@...r.at>
Date: Mon, 19 Jan 2015 19:11:57 -0500
Subject: [PATCH] document the unreachable code sequence

Signed-off-by: Nicholas Mc Guire <der.herr@...r.at>
---
 drivers/gpu/drm/radeon/ci_dpm.c                 |    7 +++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/radeon/ci_dpm.c b/drivers/gpu/drm/radeon/ci_dpm.c
index f373a81..722dfef 100644
--- a/drivers/gpu/drm/radeon/ci_dpm.c
+++ b/drivers/gpu/drm/radeon/ci_dpm.c
@@ -3808,7 +3808,12 @@ static void ci_find_dpm_states_clocks_in_dpm_table(struct radeon_device *rdev,
 	if (i >= sclk_table->count) {
 		pi->need_update_smu7_dpm_table |= DPMTABLE_OD_UPDATE_SCLK;
 	} else {
-		/* XXX check display min clock requirements */
+		/*
+		 * XXX Check display min clock requirements.
+		 * This is a place holder for the future support of
+		 * dynamically adjusting the disp clock where we'll
+		 * need to update the sclk for ds mode.
+		 */
 		if (CISLAND_MINIMUM_ENGINE_CLOCK != CISLAND_MINIMUM_ENGINE_CLOCK)
 			pi->need_update_smu7_dpm_table |= DPMTABLE_UPDATE_SCLK;
 	}
-- 
1.7.10.4

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