On Fri, Sep 14, 2018 at 07:18:44AM -0700, José Roberto de Souza wrote:
> Instead of have the same code spread into 4 platforms lets share it.
> BXT do not have a PCH so here also handling this case by unseting
> RESET_PCH_HANDSHAKE_ENABLE.
>
> v2(Rodrigo):
> - renamed to intel_pch_reset_handshake()
> - added comment about why BXT need the bit to be unset
>
> Cc: Rodrigo Vivi <[email protected]>
> Signed-off-by: José Roberto de Souza <[email protected]>
> ---
> drivers/gpu/drm/i915/intel_runtime_pm.c | 36 ++++++++++++-------------
> 1 file changed, 17 insertions(+), 19 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_runtime_pm.c
> b/drivers/gpu/drm/i915/intel_runtime_pm.c
> index 9bebec389de1..1bcd0e51fca1 100644
> --- a/drivers/gpu/drm/i915/intel_runtime_pm.c
> +++ b/drivers/gpu/drm/i915/intel_runtime_pm.c
> @@ -3239,18 +3239,29 @@ static void icl_mbus_init(struct drm_i915_private
> *dev_priv)
> I915_WRITE(MBUS_ABOX_CTL, val);
> }
>
> +static void intel_pch_reset_handshake(struct drm_i915_private *dev_priv)
> +{
> + u32 val = I915_READ(HSW_NDE_RSTWRN_OPT);
> +
> + /* BXT don't have PCH and it requires that this bit is always unset */
> + if (HAS_PCH_SPLIT(dev_priv))
Still would prefer 'bool enable' etc. rather than this magic inside.
> + val |= RESET_PCH_HANDSHAKE_ENABLE;
> + else
> + val &= ~RESET_PCH_HANDSHAKE_ENABLE;
> +
> + I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> +}
> +
> static void skl_display_core_init(struct drm_i915_private *dev_priv,
> bool resume)
> {
> struct i915_power_domains *power_domains = &dev_priv->power_domains;
> struct i915_power_well *well;
> - uint32_t val;
>
> gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>
> /* enable PCH reset handshake */
> - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> - I915_WRITE(HSW_NDE_RSTWRN_OPT, val | RESET_PCH_HANDSHAKE_ENABLE);
> + intel_pch_reset_handshake(dev_priv);
>
> /* enable PG1 and Misc I/O */
> mutex_lock(&power_domains->lock);
> @@ -3306,19 +3317,10 @@ void bxt_display_core_init(struct drm_i915_private
> *dev_priv,
> {
> struct i915_power_domains *power_domains = &dev_priv->power_domains;
> struct i915_power_well *well;
> - uint32_t val;
>
> gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>
> - /*
> - * NDE_RSTWRN_OPT RST PCH Handshake En must always be 0b on BXT
> - * or else the reset will hang because there is no PCH to respond.
> - * Move the handshake programming to initialization sequence.
> - * Previously was left up to BIOS.
> - */
> - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> - val &= ~RESET_PCH_HANDSHAKE_ENABLE;
> - I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> + intel_pch_reset_handshake(dev_priv);
>
> /* Enable PG1 */
> mutex_lock(&power_domains->lock);
> @@ -3439,9 +3441,7 @@ static void cnl_display_core_init(struct
> drm_i915_private *dev_priv, bool resume
> gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>
> /* 1. Enable PCH Reset Handshake */
> - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> - val |= RESET_PCH_HANDSHAKE_ENABLE;
> - I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> + intel_pch_reset_handshake(dev_priv);
>
> /* 2. Enable Comp */
> val = I915_READ(CHICKEN_MISC_2);
> @@ -3524,9 +3524,7 @@ static void icl_display_core_init(struct
> drm_i915_private *dev_priv,
> gen9_set_dc_state(dev_priv, DC_STATE_DISABLE);
>
> /* 1. Enable PCH reset handshake. */
> - val = I915_READ(HSW_NDE_RSTWRN_OPT);
> - val |= RESET_PCH_HANDSHAKE_ENABLE;
> - I915_WRITE(HSW_NDE_RSTWRN_OPT, val);
> + intel_pch_reset_handshake(dev_priv);
>
> for (port = PORT_A; port <= PORT_B; port++) {
> /* 2. Enable DDI combo PHY comp. */
> --
> 2.19.0
>
> _______________________________________________
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> [email protected]
> https://lists.freedesktop.org/mailman/listinfo/intel-gfx
--
Ville Syrjälä
Intel
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