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<p class="msipheader87abd423" style="margin:0in"><span style="font-size:10.0pt;font-family:"Arial",sans-serif;color:#317100">[AMD Public Use]</span><o:p></o:p></p>
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<p class="MsoPlainText">Reviewed-by: Roman Li <<a href="mailto:Roman.Li@amd.com">Roman.Li@amd.com</a>><o:p></o:p></p>
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<p class="MsoNormal"><b>From:</b> Wu, Hersen <hersenxs.wu@amd.com> <br>
<b>Sent:</b> Wednesday, December 30, 2020 12:12 PM<br>
<b>To:</b> amd-gfx@lists.freedesktop.org; Deucher, Alexander <Alexander.Deucher@amd.com>; Li, Roman <Roman.Li@amd.com><br>
<b>Subject:</b> [PATCH] drm/amd/display: disable dcn10 pipe split by default<o:p></o:p></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">[Why] the initial purpose of dcn10 pipe split is to support
<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">some high bandwidth mode which requires dispclk greater<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">than max dispclk. By initial bring up power measurement<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">data, it showed power consumption is less with pipe split<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">for dcn block. This could be reason for enable pipe split<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">by default. By battery life measurement of some Chromebooks,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">result shows battery life is longer with pipe split disabled.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">[How] disable pipe split by default. Pipe split could be<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">still enabled when required dispclk is greater than max dispclk.<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">Signed-off-by: hersen wu <<a href="mailto:hersenxs.wu@amd.com">hersenxs.wu@amd.com</a>><o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">---<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c | 4 ++--<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> 1 file changed, 2 insertions(+), 2 deletions(-)<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"><o:p> </o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">diff --git a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">index bdc37831535e..17eafe209946 100644<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">--- a/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">+++ b/drivers/gpu/drm/amd/display/dc/dcn10/dcn10_resource.c<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">@@ -608,8 +608,8 @@ static const struct dc_debug_options debug_defaults_drv = {<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> .disable_pplib_clock_request = false,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> .disable_pplib_wm_range = false,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> .pplib_wm_report_mode = WM_REPORT_DEFAULT,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">- .pipe_split_policy = MPC_SPLIT_DYNAMIC,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">- .force_single_disp_pipe_split = true,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">+ .pipe_split_policy = MPC_SPLIT_AVOID,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">+ .force_single_disp_pipe_split = false,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> .disable_dcc = DCC_ENABLE,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> .voltage_align_fclk = true,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black"> .disable_stereo_support = true,<o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">-- <o:p></o:p></span></p>
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<p class="MsoNormal"><span style="font-size:12.0pt;color:black">2.17.1<o:p></o:p></span></p>
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