From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:35330 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728556AbeIMTNY (ORCPT ); Thu, 13 Sep 2018 15:13:24 -0400 From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mikita Lipski , Charlene Liu , Bhawanpreet Lakha , Alex Deucher Subject: [PATCH 4.18 166/197] drm/amd/display: update clk for various HDMI color depths Date: Thu, 13 Sep 2018 15:31:55 +0200 Message-Id: <20180913131848.199588449@linuxfoundation.org> In-Reply-To: <20180913131841.568116777@linuxfoundation.org> References: <20180913131841.568116777@linuxfoundation.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 4.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Mikita Lipski commit 81aca8e75c1b046865fb2badef95a0dcff6f73de upstream. [why] When programming tonga's connector's backend we didn't take in account that HDMI's colour depth might be more than 8bpc therefore we need to add a switch statement that would adjust the pixel clock accordingly. [how] Add a switch statement updating clock by its appropriate coefficient. Signed-off-by: Mikita Lipski Reviewed-by: Charlene Liu Acked-by: Bhawanpreet Lakha Signed-off-by: Alex Deucher Cc: stable@vger.kernel.org Signed-off-by: Greg Kroah-Hartman --- drivers/gpu/drm/amd/display/dc/bios/command_table.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) --- a/drivers/gpu/drm/amd/display/dc/bios/command_table.c +++ b/drivers/gpu/drm/amd/display/dc/bios/command_table.c @@ -808,6 +808,24 @@ static enum bp_result transmitter_contro * (=1: 8bpp, =1.25: 10bpp, =1.5:12bpp, =2: 16bpp) * LVDS mode: usPixelClock = pixel clock */ + if (cntl->signal == SIGNAL_TYPE_HDMI_TYPE_A) { + switch (cntl->color_depth) { + case COLOR_DEPTH_101010: + params.usSymClock = + cpu_to_le16((le16_to_cpu(params.usSymClock) * 30) / 24); + break; + case COLOR_DEPTH_121212: + params.usSymClock = + cpu_to_le16((le16_to_cpu(params.usSymClock) * 36) / 24); + break; + case COLOR_DEPTH_161616: + params.usSymClock = + cpu_to_le16((le16_to_cpu(params.usSymClock) * 48) / 24); + break; + default: + break; + } + } if (EXEC_BIOS_CMD_TABLE(UNIPHYTransmitterControl, params)) result = BP_RESULT_OK;