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drm/i915/dp: Helper for checking DDI_BUF_CTL Idle status

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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@linux.intel.com>
Cc: Imre Deak <imre.deak@intel.com>
Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20200701221052.8946-1-manasi.d.navare@intel.com
This commit is contained in:
Manasi Navare 2020-07-01 15:10:51 -07:00
parent 9459fd5945
commit 5a2ad99bce
1 changed files with 8 additions and 9 deletions
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17
drivers/gpu/drm/i915/display/intel_ddi.c
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@ -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)