From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38356 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755620AbdLTRUr (ORCPT ); Wed, 20 Dec 2017 12:20:47 -0500 Subject: Patch "drm/vc4: Avoid using vrefresh==0 mode in DSI htotal math." has been added to the 4.14-stable tree To: eric@anholt.net, a.hajda@samsung.com, alexander.levin@verizon.com, gregkh@linuxfoundation.org Cc: , From: Date: Wed, 20 Dec 2017 18:20:14 +0100 Message-ID: <151379041412428@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: This is a note to let you know that I've just added the patch titled drm/vc4: Avoid using vrefresh==0 mode in DSI htotal math. to the 4.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: drm-vc4-avoid-using-vrefresh-0-mode-in-dsi-htotal-math.patch and it can be found in the queue-4.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >>From foo@baz Wed Dec 20 18:17:52 CET 2017 From: Eric Anholt Date: Tue, 15 Aug 2017 16:47:19 -0700 Subject: drm/vc4: Avoid using vrefresh==0 mode in DSI htotal math. From: Eric Anholt [ Upstream commit af2eca53206c59ce9308a4f5f46c4a104a179b6b ] The incoming mode might have a missing vrefresh field if it came from drmModeSetCrtc(), which the kernel is supposed to calculate using drm_mode_vrefresh(). We could either use that or the adjusted_mode's original vrefresh value. However, we can maintain a more exact vrefresh value (not just the integer approximation), by scaling by the ratio of our clocks. v2: Use math suggested by Andrzej Hajda instead. v3: Simplify math now that adjusted_mode->clock isn't padded. v4: Drop some parens. Signed-off-by: Eric Anholt Link: https://patchwork.freedesktop.org/patch/msgid/20170815234722.20700-2-eric@anholt.net Reviewed-by: Andrzej Hajda Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/vc4/vc4_dsi.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/gpu/drm/vc4/vc4_dsi.c +++ b/drivers/gpu/drm/vc4/vc4_dsi.c @@ -866,7 +866,8 @@ static bool vc4_dsi_encoder_mode_fixup(s adjusted_mode->clock = pixel_clock_hz / 1000 + 1; /* Given the new pixel clock, adjust HFP to keep vrefresh the same. */ - adjusted_mode->htotal = pixel_clock_hz / (mode->vrefresh * mode->vtotal); + adjusted_mode->htotal = adjusted_mode->clock * mode->htotal / + mode->clock; adjusted_mode->hsync_end += adjusted_mode->htotal - mode->htotal; adjusted_mode->hsync_start += adjusted_mode->htotal - mode->htotal; Patches currently in stable-queue which might be from eric@anholt.net are queue-4.14/drm-vc4-avoid-using-vrefresh-0-mode-in-dsi-htotal-math.patch