From patchwork Tue Nov 14 22:58:32 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jonathan Marek X-Patchwork-Id: 13456090 Received: from lindbergh.monkeyblade.net (lindbergh.monkeyblade.net [23.128.96.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 007C02FC21 for ; Tue, 14 Nov 2023 23:00:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=marek.ca header.i=@marek.ca header.b="CaIrtYL5" Received: from mail-yw1-x1130.google.com (mail-yw1-x1130.google.com [IPv6:2607:f8b0:4864:20::1130]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 91F1BFF for ; Tue, 14 Nov 2023 15:00:38 -0800 (PST) Received: by mail-yw1-x1130.google.com with SMTP id 00721157ae682-5b499b18b28so71635797b3.0 for ; Tue, 14 Nov 2023 15:00:38 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=marek.ca; s=google; t=1700002838; x=1700607638; darn=vger.kernel.org; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:from:to:cc:subject:date :message-id:reply-to; bh=cpJg20SvqJHFde7hdRwbQhfmXK7eKDJA+6y+igvktAk=; b=CaIrtYL5zP0EobCPzSK6v6WsO7JTWvxsYT2Fk+qkRLqrw8VCSNwwlWuBlhvXZMTRp1 TqAZbUOTuW0OOJvdX5DTGc8ow89MFeXVDCwzfS+z1QqnZhroFynj/pLQfTkjUvTqv/Xl lNXfDC7TbkWDJUYCtrihj7tMBipBRxaAmts6TAtUaspKMyHjkvD2N7G5gH7X+98NliLA tp/yXHHr36EZxroiykF33hgrv25gzDV4cp3qge/d14LASuA/eCq8z32bUbkkjzPMlzpq oSYkENDpt3F3JyDHDbSZlBYSjk2V2GeWmsfumMZUOFNKZibTv7YNaAtgG3iDqbynJ6y0 EKIQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700002838; x=1700607638; h=content-transfer-encoding:mime-version:references:in-reply-to :message-id:date:subject:cc:to:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=cpJg20SvqJHFde7hdRwbQhfmXK7eKDJA+6y+igvktAk=; b=MATgJHTSVOXoHExGRjUcX6GN6pFOp8MH1V9+InoAbJJUJpgSxx1la8pF3o1+zhOkeH 6lnHhIvCBVzWTKi3ZY7dXfa01fXbG1SBtUP+Kkfblu39tzo0sjn5ZbZRqd99+RSEgFKa 6/BkxmcITVbN3a7OdZHOde6jKmrgNMiN8HhTVnCzsHimqUL8IFktWOYje9Q3d+GmQiJr A/eITsAuD1zTJ2rttLubckOUZCYRlBgq1gygmiQx3qLVe77+ARuTsBxEbouwJwKQ/fK1 cZAC+XyBVn9hXHnBYJGS+Euv7F6bMoK7ykYrmm9KlS2aU2KsZCiJLwQFI4vOscMdpERp FPTQ== X-Gm-Message-State: AOJu0Yzc65PDWpMTiCvG2U4JPc6u/ew7vM5No4EQbzGIHPpUSGMqK7bw lO0wl8LS1GK/EHT5/JfkTIr41g== X-Google-Smtp-Source: AGHT+IF625S3cBQuZUFbUGBAhZkGCmiGu+ZC9noNuDSK6oc2pQ7dDTxwb4mFW7Ih4VTIW4LqjLUQKA== X-Received: by 2002:a0d:ca84:0:b0:5a7:bfbf:1bbb with SMTP id m126-20020a0dca84000000b005a7bfbf1bbbmr11185827ywd.17.1700002837716; Tue, 14 Nov 2023 15:00:37 -0800 (PST) Received: from localhost.localdomain (modemcable125.110-19-135.mc.videotron.ca. [135.19.110.125]) by smtp.gmail.com with ESMTPSA id u2-20020a05621411a200b00674a45499dcsm25274qvv.88.2023.11.14.15.00.36 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 14 Nov 2023 15:00:37 -0800 (PST) From: Jonathan Marek To: freedreno@lists.freedesktop.org Cc: Rob Clark , Abhinav Kumar , Dmitry Baryshkov , Sean Paul , Marijn Suijten , David Airlie , Daniel Vetter , Jessica Zhang , Konrad Dybcio , Jiasheng Jiang , linux-arm-msm@vger.kernel.org (open list:DRM DRIVER FOR MSM ADRENO GPU), dri-devel@lists.freedesktop.org (open list:DRM DRIVER FOR MSM ADRENO GPU), linux-kernel@vger.kernel.org (open list) Subject: [PATCH v2 4/6] drm/msm/dsi: add a comment to explain pkt_per_line encoding Date: Tue, 14 Nov 2023 17:58:32 -0500 Message-Id: <20231114225857.19702-5-jonathan@marek.ca> X-Mailer: git-send-email 2.26.1 In-Reply-To: <20231114225857.19702-1-jonathan@marek.ca> References: <20231114225857.19702-1-jonathan@marek.ca> Precedence: bulk X-Mailing-List: linux-arm-msm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Make it clear why the pkt_per_line value is being "divided by 2". Signed-off-by: Jonathan Marek Reviewed-by: Dmitry Baryshkov --- drivers/gpu/drm/msm/dsi/dsi_host.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/gpu/drm/msm/dsi/dsi_host.c b/drivers/gpu/drm/msm/dsi/dsi_host.c index 66f198e21a7e..842765063b1b 100644 --- a/drivers/gpu/drm/msm/dsi/dsi_host.c +++ b/drivers/gpu/drm/msm/dsi/dsi_host.c @@ -877,6 +877,8 @@ static void dsi_update_dsc_timing(struct msm_dsi_host *msm_host, bool is_cmd_mod /* DSI_VIDEO_COMPRESSION_MODE & DSI_COMMAND_COMPRESSION_MODE * registers have similar offsets, so for below common code use * DSI_VIDEO_COMPRESSION_MODE_XXXX for setting bits + * + * pkt_per_line is log2 encoded, >>1 works for supported values (1,2,4) */ reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_PKT_PER_LINE(pkt_per_line >> 1); reg |= DSI_VIDEO_COMPRESSION_MODE_CTRL_EOL_BYTE_NUM(eol_byte_num);