On Thu, 01 Jun 2017, Aleksa Sarai <asarai@xxxxxxx> wrote:
> With gcc7, the conditional usage of (port == PORT_A ? PORT_C : PORT_A)
> triggers -Werror=int-in-bool-context which breaks the build. Instead,
> use a temporary port_other variable that avoids hitting this error.
>
> % gcc --version
> gcc (SUSE Linux) 7.1.1 20170517 [gcc-7-branch revision 248152]
> Copyright (C) 2017 Free Software Foundation, Inc.
> This is free software; see the source for copying conditions. There is NO
> warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
> % make -j8 drivers/gpu/drm/i915/intel_dsi.o
> In file included from drivers/gpu/drm/i915/intel_dsi.c:34:0:
> drivers/gpu/drm/i915/intel_dsi.c: In function ‘intel_dsi_prepare’:
> drivers/gpu/drm/i915/intel_dsi.c:1487:23: error: ?: using integer constants in boolean context [-Werror=int-in-bool-context]
> PORT_A ? PORT_C : PORT_A),
> drivers/gpu/drm/i915/i915_drv.h:3909:76: note: in definition of macro ‘I915_WRITE’
> #define I915_WRITE(reg, val) dev_priv->uncore.funcs.mmio_writel(dev_priv, (reg), (val), true)
> ^~~
> drivers/gpu/drm/i915/i915_reg.h:8280:32: note: in expansion of macro ‘_MMIO’
> #define _MMIO_MIPI(port, a, c) _MMIO(_MIPI_PORT(port, a, c))
> ^~~~~
> drivers/gpu/drm/i915/i915_reg.h:8280:38: note: in expansion of macro ‘_MIPI_PORT’
> #define _MMIO_MIPI(port, a, c) _MMIO(_MIPI_PORT(port, a, c))
> ^~~~~~~~~~
> drivers/gpu/drm/i915/i915_reg.h:8624:32: note: in expansion of macro ‘_MMIO_MIPI’
> #define MIPI_INIT_COUNT(port) _MMIO_MIPI(port, _MIPIA_INIT_COUNT, _MIPIC_INIT_COUNT)
> ^~~~~~~~~~
> drivers/gpu/drm/i915/intel_dsi.c:1486:15: note: in expansion of macro ‘MIPI_INIT_COUNT’
> I915_WRITE(MIPI_INIT_COUNT(port ==
> ^~~~~~~~~~~~~~~
>
> Signed-off-by: Aleksa Sarai <asarai@xxxxxxx>
This is probably already fixed in drm-next by
commit 0ad4dc887d4168448e8c801aa4edd8fe1e0bd534
Author: Hans de Goede <hdegoede@xxxxxxxxxx>
Date: Thu May 18 13:06:44 2017 +0200
drm/i915: Fix new -Wint-in-bool-context gcc compiler warning
which I also think is a more sensible fix than this one.
BR,
Jani.
> ---
> drivers/gpu/drm/i915/intel_dsi.c | 5 +++--
> 1 file changed, 3 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
> index 54030b68406a..53e717e7b811 100644
> --- a/drivers/gpu/drm/i915/intel_dsi.c
> +++ b/drivers/gpu/drm/i915/intel_dsi.c
> @@ -1476,14 +1476,15 @@ static void intel_dsi_prepare(struct intel_encoder *intel_encoder,
> txclkesc(intel_dsi->escape_clk_div, 100));
>
> if (IS_GEN9_LP(dev_priv) && (!intel_dsi->dual_link)) {
> + enum port port_other = port == PORT_A ? PORT_C : PORT_A;
> +
> /*
> * BXT spec says write MIPI_INIT_COUNT for
> * both the ports, even if only one is
> * getting used. So write the other port
> * if not in dual link mode.
> */
> - I915_WRITE(MIPI_INIT_COUNT(port ==
> - PORT_A ? PORT_C : PORT_A),
> + I915_WRITE(MIPI_INIT_COUNT(port_other),
> intel_dsi->init_count);
> }
--
Jani Nikula, Intel Open Source Technology Center
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