Modify the helper to add a fixed delay or poll with timeout
based on platform specification to check for either Idle bit
set (DDI_BUF_CTL is idle for disable case)
v2:
* Use 2 separate functions or idle and active (Ville)
v3:
* Change the timeout to 16usecs (Ville)
v4:
* Change the timeout 8, follow spec (Ville)
Cc: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
Cc: Imre Deak <imre.deak@xxxxxxxxx>
Signed-off-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
Reviewed-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
drivers/gpu/drm/i915/display/intel_ddi.c | 17 ++++++++---------
1 file changed, 8 insertions(+), 9 deletions(-)
diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
index 025d4052f6f8..a7de1344db69 100644
--- a/drivers/gpu/drm/i915/display/intel_ddi.c
+++ b/drivers/gpu/drm/i915/display/intel_ddi.c
@@ -1184,16 +1184,15 @@ static void intel_prepare_hdmi_ddi_buffers(struct intel_encoder *encoder,
static void intel_wait_ddi_buf_idle(struct drm_i915_private *dev_priv,
enum port port)
{
- i915_reg_t reg = DDI_BUF_CTL(port);
- int i;
-
- for (i = 0; i < 16; i++) {
- udelay(1);
- if (intel_de_read(dev_priv, reg) & DDI_BUF_IS_IDLE)
- return;
+ if (IS_BROXTON(dev_priv)) {
+ udelay(16);
+ return;
}
- drm_err(&dev_priv->drm, "Timeout waiting for DDI BUF %c idle bit\n",
- port_name(port));
+
+ if (wait_for_us((intel_de_read(dev_priv, DDI_BUF_CTL(port)) &
+ DDI_BUF_IS_IDLE), 8))
+ drm_err(&dev_priv->drm, "Timeout waiting for DDI BUF %c to get idle\n",
+ port_name(port));
}
static u32 hsw_pll_to_ddi_pll_sel(const struct intel_shared_dpll *pll)
--
2.19.1
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