On Mon, 26 Sep 2016, Imre Deak <imre.d...@intel.com> wrote:
> a277ca7dc01d should've been a no-functional-change commit, but it
> removed the initialization of the dpll_hw_state for HDMI outputs,
> resulting in state mismatches and a failed modeset with blank
> screen. Fix this by reinstating the dpll_hw_state initialization.
>
> Fixes: a277ca7dc01d ("drm/i915: Split bxt_ddi_pll_select()")
> Signed-off-by: Imre Deak <imre.d...@intel.com>
Cc: Manasi Navare <manasi.d.nav...@intel.com>
Cc: Ander Conselvan de Oliveira <ander.conselvan.de.olive...@intel.com>
Cc: Durgadoss R <durgados...@intel.com>
Cc: Rodrigo Vivi <rodrigo.v...@intel.com>
> ---
> drivers/gpu/drm/i915/intel_dpll_mgr.c | 21 ++++++++++++++++-----
> 1 file changed, 16 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dpll_mgr.c
> b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> index c26d18a..e8bf838 100644
> --- a/drivers/gpu/drm/i915/intel_dpll_mgr.c
> +++ b/drivers/gpu/drm/i915/intel_dpll_mgr.c
> @@ -1694,21 +1694,32 @@ bool bxt_ddi_dp_set_dpll_hw_state(int clock,
> return bxt_ddi_set_dpll_hw_state(clock, &clk_div, dpll_hw_state);
> }
>
> +bool bxt_ddi_hdmi_set_dpll_hw_state(struct intel_crtc *intel_crtc,
> + struct intel_crtc_state *crtc_state,
> + int clock,
> + struct intel_dpll_hw_state *dpll_hw_state)
> +{
> + struct bxt_clk_div clk_div = { };
> +
> + bxt_ddi_hdmi_pll_dividers(intel_crtc, crtc_state, clock, &clk_div);
> +
> + return bxt_ddi_set_dpll_hw_state(clock, &clk_div, dpll_hw_state);
> +}
> +
> static struct intel_shared_dpll *
> bxt_get_dpll(struct intel_crtc *crtc,
> struct intel_crtc_state *crtc_state,
> struct intel_encoder *encoder)
> {
> - struct bxt_clk_div clk_div = {0};
> - struct intel_dpll_hw_state dpll_hw_state = {0};
> + struct intel_dpll_hw_state dpll_hw_state = { };
> struct drm_i915_private *dev_priv = to_i915(crtc->base.dev);
> struct intel_digital_port *intel_dig_port;
> struct intel_shared_dpll *pll;
> int i, clock = crtc_state->port_clock;
>
> - if (encoder->type == INTEL_OUTPUT_HDMI
> - && !bxt_ddi_hdmi_pll_dividers(crtc, crtc_state,
> - clock, &clk_div))
> + if (encoder->type == INTEL_OUTPUT_HDMI &&
> + !bxt_ddi_hdmi_set_dpll_hw_state(crtc, crtc_state, clock,
> + &dpll_hw_state))
> return NULL;
>
> if ((encoder->type == INTEL_OUTPUT_DP ||
--
Jani Nikula, Intel Open Source Technology Center
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