[PATCH v2 01/10] drm/tilcdc: Allow build without __iowmb()

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

__iowmb() isn't available on most architectures. Make
its use optional so that the driver can be built on
other architectures with COMPILE_TEST=y.

v2: Add a comment stating this is for COMPILE_TEST (Tomi)

Cc: Tomi Valkeinen <tomi.valkeinen at ideasonboard.com>
Acked-by: Jyri Sarha <jyri.sarha at iki.fi>
Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
---
 drivers/gpu/drm/tilcdc/tilcdc_regs.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/gpu/drm/tilcdc/tilcdc_regs.h b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
index f90e2dc3457c..332b24327386 100644
--- a/drivers/gpu/drm/tilcdc/tilcdc_regs.h
+++ b/drivers/gpu/drm/tilcdc/tilcdc_regs.h
@@ -125,7 +125,10 @@ static inline void tilcdc_write64(struct drm_device *dev, u32 reg, u64 data)
 #if defined(iowrite64) && !defined(iowrite64_is_nonatomic)
 	iowrite64(data, addr);
 #else
+	/* allow compilation without __iowmb() for COMPILE_TEST */
+#ifdef __iowmb
 	__iowmb();
+#endif
 	/* This compiles to strd (=64-bit write) on ARM7 */
 	*(volatile u64 __force *)addr = __cpu_to_le64(data);
 #endif
-- 
2.45.2