From: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
As per BSPEC, depending on the DSI transcoder being used,
DDI clock for the associated port should be gated. This
patch does the same.
Signed-off-by: Madhav Chauhan <madhav.chauhan@xxxxxxxxx>
Signed-off-by: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
---
drivers/gpu/drm/i915/icl_dsi.c | 20 ++++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/i915/icl_dsi.c b/drivers/gpu/drm/i915/icl_dsi.c
index 2b576a70222f..e42a99fda191 100644
--- a/drivers/gpu/drm/i915/icl_dsi.c
+++ b/drivers/gpu/drm/i915/icl_dsi.c
@@ -536,6 +536,23 @@ static void gen11_dsi_setup_dphy_timings(struct intel_encoder *encoder)
}
}
+static void gen11_dsi_gate_clocks(struct intel_encoder *encoder)
+{
+ struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
+ struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
+ u32 tmp;
+ enum port port;
+
+ mutex_lock(&dev_priv->dpll_lock);
+ tmp = I915_READ(DPCLKA_CFGCR0_ICL);
+ for_each_dsi_port(port, intel_dsi->ports) {
+ tmp |= DPCLKA_CFGCR0_DDI_CLK_OFF(port);
+ }
+
+ I915_WRITE(DPCLKA_CFGCR0_ICL, tmp);
+ mutex_unlock(&dev_priv->dpll_lock);
+}
+
static void
gen11_dsi_configure_transcoder(struct intel_encoder *encoder,
const struct intel_crtc_state *pipe_config)
@@ -883,6 +900,9 @@ gen11_dsi_enable_port_and_phy(struct intel_encoder *encoder,
/* Step (4h, 4i, 4j, 4k): Configure transcoder */
gen11_dsi_configure_transcoder(encoder, pipe_config);
+
+ /* Step 4l: Gate DDI clocks */
+ gen11_dsi_gate_clocks(encoder);
}
static void gen11_dsi_powerup_panel(struct intel_encoder *encoder)
--
2.11.0
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