On Fri, Jul 12, 2013 at 02:19:40PM -0300, Paulo Zanoni wrote:
> From: Paulo Zanoni <paulo.r.zan...@intel.com>
>
> We currently don't support HDMI clock bending nor use SSC for DP or
> HDMI on Haswell, so the only case where we need CLKOUT_DP is for VGA.
>
> Signed-off-by: Paulo Zanoni <paulo.r.zan...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_display.c | 38
> ++++++++++++++++++++++++++++++++----
> 1 file changed, 34 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_display.c
> b/drivers/gpu/drm/i915/intel_display.c
> index 5f3b636..059c9a8 100644
> --- a/drivers/gpu/drm/i915/intel_display.c
> +++ b/drivers/gpu/drm/i915/intel_display.c
> @@ -5305,6 +5305,36 @@ static void lpt_enable_clkout_dp(struct drm_device
> *dev, bool with_spread,
> mutex_unlock(&dev_priv->dpio_lock);
> }
>
> +/* Sequence to disable CLKOUT_DP */
> +static void lpt_disable_clkout_dp(struct drm_device *dev)
> +{
> + struct drm_i915_private *dev_priv = dev->dev_private;
> + uint32_t tmp;
> +
> + mutex_lock(&dev_priv->dpio_lock);
> +
> + if (IS_ULT(dev_priv->dev)) {
> + tmp = intel_sbi_read(dev_priv, SBI_GEN0, SBI_ICLK);
> + tmp &= ~SBI_GEN0_ENABLE;
> + intel_sbi_write(dev_priv, SBI_GEN0, tmp, SBI_ICLK);
> + } else {
> + tmp = intel_sbi_read(dev_priv, SBI_DBUFF0, SBI_ICLK);
> + tmp &= ~SBI_DBUFF0_ENABLE;
> + intel_sbi_write(dev_priv, SBI_DBUFF0, tmp, SBI_ICLK);
> + }
> +
> + tmp = intel_sbi_read(dev_priv, SBI_SSCCTL, SBI_ICLK);
> + if (!(tmp & SBI_SSCCTL_PATHALT)) {
> + tmp |= SBI_SSCCTL_PATHALT;
> + intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
> + udelay(32);
> + }
Apologies if this is stupid, I'm new to this part of the doc, shouldn't
it be:
if (tmp & ~SBI_SSCCTL_DISABLE == 0)
> + tmp |= SBI_SSCCTL_DISABLE;
> + intel_sbi_write(dev_priv, SBI_SSCCTL, tmp, SBI_ICLK);
> +
> + mutex_unlock(&dev_priv->dpio_lock);
> +}
> +
> static void lpt_init_pch_refclk(struct drm_device *dev)
> {
> struct drm_mode_config *mode_config = &dev->mode_config;
> @@ -5319,10 +5349,10 @@ static void lpt_init_pch_refclk(struct drm_device
> *dev)
> }
> }
>
> - if (!has_vga)
> - return;
> -
> - lpt_enable_clkout_dp(dev, true, true);
> + if (has_vga)
> + lpt_enable_clkout_dp(dev, true, true);
> + else
> + lpt_disable_clkout_dp(dev);
> }
--
Ben Widawsky, Intel Open Source Technology Center
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