[PATCH] drm/i915: Tighten mmio arrays for MIPI_PORT

[PATCH] drm/i915: Tighten mmio arrays for MIPI_PORT

[Chris Wilson]

drivers/gpu/drm/i915/intel_dsi.c: In function ‘intel_dsi_prepare’:
drivers/gpu/drm/i915/intel_dsi.c:1308:1: error: the frame size of 2488 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]

which is caused by the compiling expanding every _MIPI_PORT into an
on-stack array of u32[3] at every callsite. Not sure why only one
machine/compiler appears susceptible, but with a minor tweak to _MIPI_PORT
we can defer the error until later.

This is a partial revert of commit ce64645d86ac ("drm/i915: use variadic
macros and arrays to choose port/pipe based registers") for a particular
bad offender.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Jani Nikula <jani.nikula@intel.com>
---
 drivers/gpu/drm/i915/i915_reg.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
index 93dcbbccb740..4906ce4d3a5d 100644
--- a/drivers/gpu/drm/i915/i915_reg.h
+++ b/drivers/gpu/drm/i915/i915_reg.h
@@ -8264,7 +8264,7 @@ enum {
 
 /* MIPI DSI registers */
 
-#define _MIPI_PORT(port, a, c)	_PORT3(port, a, 0, c)	/* ports A and C only */
+#define _MIPI_PORT(port, a, c)	((port) ? c : a)	/* ports A and C only */
 #define _MMIO_MIPI(port, a, c)	_MMIO(_MIPI_PORT(port, a, c))
 
 #define MIPIO_TXESC_CLK_DIV1			_MMIO(0x160004)
-- 
2.11.0

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Re: [PATCH] drm/i915: Tighten mmio arrays for MIPI_PORT

[Jani Nikula]

On Tue, 28 Feb 2017, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> drivers/gpu/drm/i915/intel_dsi.c: In function ‘intel_dsi_prepare’:
> drivers/gpu/drm/i915/intel_dsi.c:1308:1: error: the frame size of 2488 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
>
> which is caused by the compiling expanding every _MIPI_PORT into an
> on-stack array of u32[3] at every callsite. Not sure why only one
> machine/compiler appears susceptible, but with a minor tweak to _MIPI_PORT
> we can defer the error until later.
>
> This is a partial revert of commit ce64645d86ac ("drm/i915: use variadic
> macros and arrays to choose port/pipe based registers") for a particular
> bad offender.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: Jani Nikula <jani.nikula@intel.com>

:(

Acked-by: Jani Nikula <jani.nikula@intel.com>



> ---
>  drivers/gpu/drm/i915/i915_reg.h | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/i915_reg.h b/drivers/gpu/drm/i915/i915_reg.h
> index 93dcbbccb740..4906ce4d3a5d 100644
> --- a/drivers/gpu/drm/i915/i915_reg.h
> +++ b/drivers/gpu/drm/i915/i915_reg.h
> @@ -8264,7 +8264,7 @@ enum {
>  
>  /* MIPI DSI registers */
>  
> -#define _MIPI_PORT(port, a, c)	_PORT3(port, a, 0, c)	/* ports A and C only */
> +#define _MIPI_PORT(port, a, c)	((port) ? c : a)	/* ports A and C only */
>  #define _MMIO_MIPI(port, a, c)	_MMIO(_MIPI_PORT(port, a, c))
>  
>  #define MIPIO_TXESC_CLK_DIV1			_MMIO(0x160004)

-- 
Jani Nikula, Intel Open Source Technology Center
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Re: [PATCH] drm/i915: Tighten mmio arrays for MIPI_PORT

[Chris Wilson]

On Tue, Feb 28, 2017 at 05:00:28PM +0200, Jani Nikula wrote:
> On Tue, 28 Feb 2017, Chris Wilson <chris@chris-wilson.co.uk> wrote:
> > drivers/gpu/drm/i915/intel_dsi.c: In function ‘intel_dsi_prepare’:
> > drivers/gpu/drm/i915/intel_dsi.c:1308:1: error: the frame size of 2488 bytes is larger than 2048 bytes [-Werror=frame-larger-than=]
> >
> > which is caused by the compiling expanding every _MIPI_PORT into an
> > on-stack array of u32[3] at every callsite. Not sure why only one
> > machine/compiler appears susceptible, but with a minor tweak to _MIPI_PORT
> > we can defer the error until later.
> >
> > This is a partial revert of commit ce64645d86ac ("drm/i915: use variadic
> > macros and arrays to choose port/pipe based registers") for a particular
> > bad offender.
> >
> > Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> > Cc: Jani Nikula <jani.nikula@intel.com>
> 
> :(
> 
> Acked-by: Jani Nikula <jani.nikula@intel.com>

After a night's rest, it still doesn't compile, so pushed.
Thanks,
-Chris

-- 
Chris Wilson, Intel Open Source Technology Centre
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✓ Fi.CI.BAT: success for drm/i915: Tighten mmio arrays for MIPI_PORT

[Patchwork]

== Series Details ==

Series: drm/i915: Tighten mmio arrays for MIPI_PORT
URL   : https://patchwork.freedesktop.org/series/20402/
State : success

== Summary ==

Series 20402v1 drm/i915: Tighten mmio arrays for MIPI_PORT
https://patchwork.freedesktop.org/api/1.0/series/20402/revisions/1/mbox/

fi-bdw-5557u     total:278  pass:267  dwarn:0   dfail:0   fail:0   skip:11 
fi-bsw-n3050     total:278  pass:239  dwarn:0   dfail:0   fail:0   skip:39 
fi-bxt-j4205     total:278  pass:259  dwarn:0   dfail:0   fail:0   skip:19 
fi-bxt-t5700     total:108  pass:95   dwarn:0   dfail:0   fail:0   skip:12 
fi-byt-n2820     total:278  pass:247  dwarn:0   dfail:0   fail:0   skip:31 
fi-hsw-4770      total:278  pass:262  dwarn:0   dfail:0   fail:0   skip:16 
fi-hsw-4770r     total:278  pass:262  dwarn:0   dfail:0   fail:0   skip:16 
fi-ilk-650       total:278  pass:228  dwarn:0   dfail:0   fail:0   skip:50 
fi-ivb-3520m     total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18 
fi-ivb-3770      total:278  pass:260  dwarn:0   dfail:0   fail:0   skip:18 
fi-kbl-7500u     total:278  pass:259  dwarn:1   dfail:0   fail:0   skip:18 
fi-skl-6260u     total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10 
fi-skl-6700hq    total:278  pass:261  dwarn:0   dfail:0   fail:0   skip:17 
fi-skl-6700k     total:278  pass:256  dwarn:4   dfail:0   fail:0   skip:18 
fi-skl-6770hq    total:278  pass:268  dwarn:0   dfail:0   fail:0   skip:10 
fi-snb-2520m     total:278  pass:250  dwarn:0   dfail:0   fail:0   skip:28 
fi-snb-2600      total:278  pass:249  dwarn:0   dfail:0   fail:0   skip:29 

5d37006b578e38562382215e8782cfced9c992ce drm-tip: 2017y-02m-28d-16h-27m-13s UTC integration manifest
9e4b700 drm/i915: Tighten mmio arrays for MIPI_PORT

== Logs ==

For more details see: https://intel-gfx-ci.01.org/CI/Patchwork_4007/
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