From 42db67d664af417e946211c7f1f4178c782a582a Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 28 Aug 2015 21:26:27 +0300 Subject: [PATCH] drm/i915: Move {pin, long}_mask initialization to caller from intel_get_hpd_pins() MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit Move the 0 initialization of pin_mask and long_mask from intel_get_hpd_pins() into each caller. This we we can call intel_get_hpd_pins() multiple times to accumulate more pins from several sources. v2: Add a comment explaining the dangers of intel_get_hpd_pins() (Paulo) Reviewed-by: Paulo Zanoni Signed-off-by: Ville Syrjälä Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/i915_irq.c | 19 +++++++++++-------- 1 file changed, 11 insertions(+), 8 deletions(-) diff --git a/drivers/gpu/drm/i915/i915_irq.c b/drivers/gpu/drm/i915/i915_irq.c index 3388b6475058..71293893482a 100644 --- a/drivers/gpu/drm/i915/i915_irq.c +++ b/drivers/gpu/drm/i915/i915_irq.c @@ -1292,7 +1292,13 @@ static bool i9xx_port_hotplug_long_detect(enum port port, u32 val) } } -/* Get a bit mask of pins that have triggered, and which ones may be long. */ +/* + * Get a bit mask of pins that have triggered, and which ones may be long. + * This can be called multiple times with the same masks to accumulate + * hotplug detection results from several registers. + * + * Note that the caller is expected to zero out the masks initially. + */ static void intel_get_hpd_pins(u32 *pin_mask, u32 *long_mask, u32 hotplug_trigger, u32 dig_hotplug_reg, const u32 hpd[HPD_NUM_PINS], @@ -1301,9 +1307,6 @@ static void intel_get_hpd_pins(u32 *pin_mask, u32 *long_mask, enum port port; int i; - *pin_mask = 0; - *long_mask = 0; - for_each_hpd_pin(i) { if ((hpd[i] & hotplug_trigger) == 0) continue; @@ -1544,7 +1547,7 @@ static void i9xx_hpd_irq_handler(struct drm_device *dev) { struct drm_i915_private *dev_priv = dev->dev_private; u32 hotplug_status = I915_READ(PORT_HOTPLUG_STAT); - u32 pin_mask, long_mask; + u32 pin_mask = 0, long_mask = 0; if (!hotplug_status) return; @@ -1673,7 +1676,7 @@ static void ibx_irq_handler(struct drm_device *dev, u32 pch_iir) u32 hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK; if (hotplug_trigger) { - u32 dig_hotplug_reg, pin_mask, long_mask; + u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0; dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG); I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg); @@ -1781,7 +1784,7 @@ static void cpt_irq_handler(struct drm_device *dev, u32 pch_iir) hotplug_trigger = pch_iir & SDE_HOTPLUG_MASK_CPT; if (hotplug_trigger) { - u32 dig_hotplug_reg, pin_mask, long_mask; + u32 dig_hotplug_reg, pin_mask = 0, long_mask = 0; dig_hotplug_reg = I915_READ(PCH_PORT_HOTPLUG); I915_WRITE(PCH_PORT_HOTPLUG, dig_hotplug_reg); @@ -2004,7 +2007,7 @@ static void bxt_hpd_handler(struct drm_device *dev, uint32_t iir_status) { struct drm_i915_private *dev_priv = dev->dev_private; u32 hp_control, hp_trigger; - u32 pin_mask, long_mask; + u32 pin_mask = 0, long_mask = 0; /* Get the status */ hp_trigger = iir_status & BXT_DE_PORT_HOTPLUG_MASK; -- 2.20.1