On Tue, Oct 3, 2017 at 3:08 PM, Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx> wrote:
> HDMI Mode selection on CNL is on CFGCR0 for that PLL, not
> on in a global CTRL1 as it was on SKL.
>
> The original patch addressed this difference, but leaving behind
> this single entry here. So we were checking the wrong bits during
> the PLL initialization and consequently avoiding the CFGCR1 setup
> during HDMI initialization. Luckly when only HDMI was in use BIOS
> had already setup this for us. But the dual display with hot plug
> were messed up.
>
> Fixes: a927c927de34 ("drm/i915/cnl: Initialize PLLs")
> Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
> Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> Cc: Kahola, Mika <mika.kahola@xxxxxxxxx>
> Signed-off-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Reviewed-by: James Ausmus <james.ausmus@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/intel_dpll_mgr.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> index 55997389a29f..032fd915e929 100644
> --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> @@ -2000,7 +2000,7 @@ static void cnl_ddi_pll_enable(struct drm_i915_private *dev_priv,
>
> /* 3. Configure DPLL_CFGCR0 */
> /* Avoid touch CFGCR1 if HDMI mode is not enabled */
> - if (pll->state.hw_state.cfgcr0 & DPLL_CTRL1_HDMI_MODE(pll->id)) {
> + if (pll->state.hw_state.cfgcr0 & DPLL_CFGCR0_HDMI_MODE) {
> val = pll->state.hw_state.cfgcr1;
> I915_WRITE(CNL_DPLL_CFGCR1(pll->id), val);
> /* 4. Reab back to ensure writes completed */
> --
> 2.13.5
>
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--
James Ausmus
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