From: Deepak M <m.deepak@intel.com>
To: intel-gfx@lists.freedesktop.org
Cc: Deepak M <m.deepak@intel.com>, Gaurav K Singh <gaurav.k.singh@intel.com>
Subject: [PATCH] drm/i915: Add DPI FIFO empty status check
Date: Fri, 4 Dec 2015 21:41:17 +0530 [thread overview]
Message-ID: <1449245477-16401-1-git-send-email-m.deepak@intel.com> (raw)
In-Reply-To: <20151204094948.GN4437@intel.com>
From: Gaurav K Singh <gaurav.k.singh@intel.com>
Before sending TURN ON packet,check the DPI
FIFO empty status.
v2: Change in commit message
Checking for FIFO empty only during TURN ON packet.
Signed-off-by: Gaurav K Singh <gaurav.k.singh@intel.com>
Signed-off-by: Deepak M <m.deepak@intel.com>
---
Got to know about the patch where they are removing this
DPI FIFO empty check while sending the SHUTDOWN packet.
http://lists.freedesktop.org/archives/intel-gfx/2014-July/048401.html
According added the check and waiting for DPI FIFIO empty
only when TURN_ON packet is sent.
drivers/gpu/drm/i915/intel_dsi.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/gpu/drm/i915/intel_dsi.c b/drivers/gpu/drm/i915/intel_dsi.c
index 170ae6f..495056f 100644
--- a/drivers/gpu/drm/i915/intel_dsi.c
+++ b/drivers/gpu/drm/i915/intel_dsi.c
@@ -222,6 +222,12 @@ static int dpi_send_cmd(struct intel_dsi *intel_dsi, u32 cmd, bool hs,
else
cmd |= DPI_LP_MODE;
+ mask = DPI_FIFO_EMPTY;
+
+ if ((cmd & TURN_ON) && wait_for((I915_READ(MIPI_GEN_FIFO_STAT(port)) &
+ mask) == mask, 50))
+ DRM_ERROR("Timeout waiting for DPI FIFO empty\n");
+
/* clear bit */
I915_WRITE(MIPI_INTR_STAT(port), SPL_PKT_SENT_INTERRUPT);
--
1.9.1
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next prev parent reply other threads:[~2015-12-04 10:37 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-12-04 14:17 [PATCH 1/3] drm/i915: Add DPI FIFO empty status check Deepak M
2015-12-04 9:49 ` Ville Syrjälä
2015-12-04 9:55 ` Deepak, M
2015-12-04 16:11 ` Deepak M [this message]
2015-12-04 11:26 ` [PATCH] " Ville Syrjälä
2015-12-09 11:35 ` Deepak M
2015-12-09 14:34 ` Ville Syrjälä
2015-12-10 9:08 ` Daniel Vetter
2016-01-22 8:31 ` Jani Nikula
2015-12-04 14:17 ` [PATCH 2/3] drm/i915: Correct the Ref clock value for BXT Deepak M
2015-12-04 9:55 ` Ville Syrjälä
2015-12-04 16:22 ` Daniel Vetter
2015-12-04 16:25 ` Deepak, M
2015-12-04 17:20 ` Ville Syrjälä
2015-12-04 14:17 ` [PATCH 3/3] drm/i915: Use the ceil value for the additional clk divider Deepak M
2015-12-04 11:51 ` Ville Syrjälä
2015-12-04 16:59 ` Deepak, M
2016-01-20 11:06 ` [PATCH 1/3] drm/i915: Add DPI FIFO empty status check Mika Kahola
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