<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=us-ascii">
<style type="text/css" style="display:none;"> P {margin-top:0;margin-bottom:0;} </style>
</head>
<body dir="ltr">
<p style="font-family:Arial;font-size:10pt;color:#317100;margin:15pt;" align="Left">
[AMD Public Use]<br>
</p>
<br>
<div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
I would but MALL is not fully validated so it might cause underflow issues if we keep it enabled by default. I can create a feature flag mask if that helps?</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
<br>
</div>
<div style="font-family: Calibri, Arial, Helvetica, sans-serif; font-size: 12pt; color: rgb(0, 0, 0);">
Bhawan<br>
</div>
<div id="appendonsend"></div>
<hr style="display:inline-block;width:98%" tabindex="-1">
<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Deucher, Alexander <Alexander.Deucher@amd.com><br>
<b>Sent:</b> December 17, 2020 12:04 PM<br>
<b>To:</b> Lakha, Bhawanpreet <Bhawanpreet.Lakha@amd.com>; Kazlauskas, Nicholas <Nicholas.Kazlauskas@amd.com><br>
<b>Cc:</b> amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org><br>
<b>Subject:</b> Re: [PATCH 2/2] drm/amd/display: enable idle optimizations for linux (MALL stutter)</font>
<div> </div>
</div>
<style type="text/css" style="display:none">
<!--
p
        {margin-top:0;
        margin-bottom:0}
-->
</style>
<div dir="ltr">
<p align="Left" style="font-family:Arial; font-size:10pt; color:#317100; margin:15pt">
[AMD Public Use]<br>
</p>
<br>
<div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Can we drop the Kconfig?  With that, the series is:</div>
<div style="font-family:Calibri,Arial,Helvetica,sans-serif; font-size:12pt; color:rgb(0,0,0)">
Acked-by: Alex Deucher <alexander.deucher@amd.com><br>
</div>
<div id="x_appendonsend"></div>
<hr tabindex="-1" style="display:inline-block; width:98%">
<div id="x_divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" color="#000000" style="font-size:11pt"><b>From:</b> Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com><br>
<b>Sent:</b> Thursday, December 17, 2020 11:54 AM<br>
<b>To:</b> Kazlauskas, Nicholas <Nicholas.Kazlauskas@amd.com>; Deucher, Alexander <Alexander.Deucher@amd.com><br>
<b>Cc:</b> amd-gfx@lists.freedesktop.org <amd-gfx@lists.freedesktop.org>; Lakha, Bhawanpreet <Bhawanpreet.Lakha@amd.com>; Kazlauskas, Nicholas <Nicholas.Kazlauskas@amd.com><br>
<b>Subject:</b> [PATCH 2/2] drm/amd/display: enable idle optimizations for linux (MALL stutter)</font>
<div> </div>
</div>
<div class="x_BodyFragment"><font size="2"><span style="font-size:11pt">
<div class="x_PlainText">[Why]<br>
We can only use this feature when the display is idle. When active vblank<br>
irq count is 0 we know all the displays are idle.<br>
<br>
[How]<br>
-Add a active vblank irq counter<br>
-Update the counter when we enable/disable vblank irq<br>
-if vblank irq count is 0 we can consider mall stutter<br>
<br>
Change-Id: Ib1e14a84ee2e8c6e057072128693449665012584<br>
Signed-off-by: Bhawanpreet Lakha <Bhawanpreet.Lakha@amd.com><br>
Acked-by: Alex Deucher <alexander.deucher@amd.com><br>
Reviewed-by: Nick Kazlauskas <Nicholas.Kazlauskas@amd.com><br>
---<br>
 drivers/gpu/drm/amd/display/Kconfig           |  6 +++++<br>
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c | 22 +++++++++++++++++++<br>
 .../gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h |  9 ++++++++<br>
 drivers/gpu/drm/amd/display/dc/dc.h           |  3 +++<br>
 4 files changed, 40 insertions(+)<br>
<br>
diff --git a/drivers/gpu/drm/amd/display/Kconfig b/drivers/gpu/drm/amd/display/Kconfig<br>
index 797b5d4b43e5..2444e664c7ee 100644<br>
--- a/drivers/gpu/drm/amd/display/Kconfig<br>
+++ b/drivers/gpu/drm/amd/display/Kconfig<br>
@@ -23,6 +23,12 @@ config DRM_AMD_DC_HDCP<br>
         help<br>
           Choose this option if you want to support HDCP authentication.<br>
 <br>
+config DRM_AMD_DC_MALL<br>
+       bool "Enable MALL support"<br>
+       depends on DRM_AMD_DC<br>
+       help<br>
+         Choose this option if you want to support MALL<br>
+<br>
 config DRM_AMD_DC_SI<br>
         bool "AMD DC support for Southern Islands ASICs"<br>
         default n<br>
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c<br>
index a78ec16418b3..080f2a52cfed 100644<br>
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c<br>
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c<br>
@@ -5479,6 +5479,7 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)<br>
         struct amdgpu_crtc *acrtc = to_amdgpu_crtc(crtc);<br>
         struct amdgpu_device *adev = drm_to_adev(crtc->dev);<br>
         struct dm_crtc_state *acrtc_state = to_dm_crtc_state(crtc->state);<br>
+       struct amdgpu_display_manager *dm = &adev->dm;<br>
         int rc = 0;<br>
 <br>
         if (enable) {<br>
@@ -5494,7 +5495,28 @@ static inline int dm_set_vblank(struct drm_crtc *crtc, bool enable)<br>
                 return rc;<br>
 <br>
         irq_source = IRQ_TYPE_VBLANK + acrtc->otg_inst;<br>
+#if defined(CONFIG_DRM_AMD_DC_MALL)<br>
+<br>
+       if (!dc_interrupt_set(adev->dm.dc, irq_source, enable))<br>
+               return -EBUSY;<br>
+<br>
+       mutex_lock(&dm->dc_lock);<br>
+<br>
+       if (enable)<br>
+               dm->active_vblank_irq_count++;<br>
+       else<br>
+               dm->active_vblank_irq_count--;<br>
+<br>
+       dc_allow_idle_optimizations(<br>
+               adev->dm.dc, dm->active_vblank_irq_count == 0 ? true : false);<br>
+<br>
+       DRM_DEBUG_DRIVER("Allow idle optimizations (MALL): %d\n", dm->active_vblank_irq_count == 0);<br>
+       mutex_unlock(&dm->dc_lock);<br>
+<br>
+       return 0;<br>
+#else<br>
         return dc_interrupt_set(adev->dm.dc, irq_source, enable) ? 0 : -EBUSY;<br>
+#endif<br>
 }<br>
 <br>
 static int dm_enable_vblank(struct drm_crtc *crtc)<br>
diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h<br>
index 251af783f6b1..cab44bbd2e35 100644<br>
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h<br>
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.h<br>
@@ -336,6 +336,15 @@ struct amdgpu_display_manager {<br>
          */<br>
         const struct gpu_info_soc_bounding_box_v1_0 *soc_bounding_box;<br>
 <br>
+#if defined(CONFIG_DRM_AMD_DC_MALL)<br>
+       /**<br>
+        * @active_vblank_irq_count<br>
+        *<br>
+        * number of currently active vblank irqs<br>
+        */<br>
+       uint32_t active_vblank_irq_count;<br>
+#endif<br>
+<br>
 #ifdef CONFIG_DEBUG_FS<br>
         /* set the crc calculation window*/<br>
         struct drm_property *crc_win_x_start_property;<br>
diff --git a/drivers/gpu/drm/amd/display/dc/dc.h b/drivers/gpu/drm/amd/display/dc/dc.h<br>
index 33642566bcb2..9d245033eb3d 100644<br>
--- a/drivers/gpu/drm/amd/display/dc/dc.h<br>
+++ b/drivers/gpu/drm/amd/display/dc/dc.h<br>
@@ -504,6 +504,9 @@ struct dc_debug_options {<br>
         bool dmcub_emulation;<br>
 #if defined(CONFIG_DRM_AMD_DC_DCN)<br>
         bool disable_idle_power_optimizations;<br>
+#endif<br>
+#ifdef CONFIG_DRM_AMD_DC_MALL<br>
+       unsigned int mall_size_override;<br>
 #endif<br>
         bool dmub_command_table; /* for testing only */<br>
         struct dc_bw_validation_profile bw_val_profile;<br>
-- <br>
2.25.1<br>
<br>
</div>
</span></font></div>
</div>
</div>
</div>
</body>
</html>