From 4768d5c5882e2745eccc05151d143f0db0711ffe Mon Sep 17 00:00:00 2001 From: Imre Deak Date: Tue, 27 May 2014 19:00:09 +0300 Subject: [PATCH] drm/i915: dsi: fix pipe-off timeout due to port vs. pipe disable ordering If we disable first the port (by disabling DPI) and only then the display pipe the pipe-off flag will never be set, possibly leading to a hanged pipe state at the next modeset-enable. Note that according to the VLV2 display cluster HAS, we should disable the port before the pipe. This doesn't seem to match reality based on the above and it's also asymmetric with the enabling sequence, where we first enable the port and then the pipe. v2: - send the panel shutdown command before stopping the pipe, since this is the recommended sequence (Shobhit) Signed-off-by: Imre Deak Reviewed-by: Shobhit Kumar Signed-off-by: Daniel Vetter --- drivers/gpu/drm/i915/intel_dsi.c | 21 ++++++++++++++++----- 1 file changed, 16 insertions(+), 5 deletions(-) diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c index 944a4211aa91..02f99d768d49 100644 --- a/drivers/gpu/drm/i915/intel_dsi.c +++ b/drivers/gpu/drm/i915/intel_dsi.c @@ -206,6 +206,19 @@ static void intel_dsi_enable_nop(struct intel_encoder *encoder) */ } +static void intel_dsi_pre_disable(struct intel_encoder *encoder) +{ + struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base); + + DRM_DEBUG_KMS("\n"); + + if (is_vid_mode(intel_dsi)) { + /* Send Shutdown command to the panel in LP mode */ + dpi_send_cmd(intel_dsi, SHUTDOWN, DPI_LP_MODE_EN); + msleep(10); + } +} + static void intel_dsi_disable(struct intel_encoder *encoder) { struct drm_device *dev = encoder->base.dev; @@ -218,10 +231,6 @@ static void intel_dsi_disable(struct intel_encoder *encoder) DRM_DEBUG_KMS("\n"); if (is_vid_mode(intel_dsi)) { - /* Send Shutdown command to the panel in LP mode */ - dpi_send_cmd(intel_dsi, SHUTDOWN, DPI_LP_MODE_EN); - msleep(10); - /* de-assert ip_tg_enable signal */ temp = I915_READ(MIPI_PORT_CTRL(pipe)); I915_WRITE(MIPI_PORT_CTRL(pipe), temp & ~DPI_ENABLE); @@ -293,6 +302,8 @@ static void intel_dsi_post_disable(struct intel_encoder *encoder) DRM_DEBUG_KMS("\n"); + intel_dsi_disable(encoder); + intel_dsi_clear_device_ready(encoder); val = I915_READ(DSPCLK_GATE_D); @@ -695,7 +706,7 @@ bool intel_dsi_init(struct drm_device *dev) intel_encoder->pre_pll_enable = intel_dsi_pre_pll_enable; intel_encoder->pre_enable = intel_dsi_pre_enable; intel_encoder->enable = intel_dsi_enable_nop; - intel_encoder->disable = intel_dsi_disable; + intel_encoder->disable = intel_dsi_pre_disable; intel_encoder->post_disable = intel_dsi_post_disable; intel_encoder->get_hw_state = intel_dsi_get_hw_state; intel_encoder->get_config = intel_dsi_get_config; -- 2.39.5