From nobody Thu Dec 18 19:45:42 2025 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 60E4DC77B75 for ; Fri, 5 May 2023 05:22:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230365AbjEEFV7 (ORCPT ); Fri, 5 May 2023 01:21:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:53998 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230350AbjEEFVr (ORCPT ); Fri, 5 May 2023 01:21:47 -0400 Received: from relay8-d.mail.gandi.net (relay8-d.mail.gandi.net [IPv6:2001:4b98:dc4:8::228]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id AC71314E77; Thu, 4 May 2023 22:21:40 -0700 (PDT) Received: (Authenticated sender: me@crly.cz) by mail.gandi.net (Postfix) with ESMTPSA id 3AE901BF208; Fri, 5 May 2023 05:21:36 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=crly.cz; s=gm1; t=1683264099; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=MA7Dv2Qs3SnMl09WxFtijC9xKkxYGB+hhEONwk+AOpE=; b=KRxGZnPIwFPcXwsh95D8QJGiTws0jL1SgdggYOeNdxHN2tLFu4HCSu5X7f9udRmDknwQ8j PGD3r6spEUAp6+4VkbtTk7vhSjD7fZvmpXSRF7Y+wJP+eXOM9OtiXUA2ee6EvjVeOcSC60 T8p8Np2hXSMdk6AggOc+AMiOUamTC5KZHkVw4Z3VjNoCVMlak3YJEt9rkw2jSAHZCMjgdy pxMaby2+q96VF3MvfXHhEHaJ07BbQ2DTFqFCz+3zkZg/7uf5LFYlnCTKurKb1dBHdh5Ltd NBpVVWhjcdsQvg8+ysJszRpAQdvIX8kFInl1XnOGZ0UAebddt4DaHhQFQrvffQ== From: Roman Beranek To: Maxime Ripard , David Airlie , Daniel Vetter , Chen-Yu Tsai , Jernej Skrabec , Samuel Holland , Michael Turquette , Stephen Boyd , Rob Herring , Krzysztof Kozlowski Cc: Frank Oltmanns , Icenowy Zheng , Ondrej Jirman , devicetree@vger.kernel.org, dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-sunxi@lists.linux.dev, linux-clk@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 4/4] drm: sun4i: calculate proper DCLK rate for DSI Date: Fri, 5 May 2023 07:21:10 +0200 Message-Id: <20230505052110.67514-5-me@crly.cz> X-Mailer: git-send-email 2.32.0 (Apple Git-132) In-Reply-To: <20230505052110.67514-1-me@crly.cz> References: <20230505052110.67514-1-me@crly.cz> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Type: text/plain; charset="utf-8" In DSI mode, TCON0's data clock is required to run at 1/4 the per-lane bit rate. Signed-off-by: Roman Beranek --- drivers/gpu/drm/sun4i/sun4i_tcon.c | 36 +++++++++++++++++------------- 1 file changed, 21 insertions(+), 15 deletions(-) diff --git a/drivers/gpu/drm/sun4i/sun4i_tcon.c b/drivers/gpu/drm/sun4i/sun= 4i_tcon.c index eec26b1faa4b..b263de7a8237 100644 --- a/drivers/gpu/drm/sun4i/sun4i_tcon.c +++ b/drivers/gpu/drm/sun4i/sun4i_tcon.c @@ -291,18 +291,6 @@ static int sun4i_tcon_get_clk_delay(const struct drm_d= isplay_mode *mode, return delay; } =20 -static void sun4i_tcon0_mode_set_common(struct sun4i_tcon *tcon, - const struct drm_display_mode *mode) -{ - /* Configure the dot clock */ - clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); - - /* Set the resolution */ - regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, - SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | - SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); -} - static void sun4i_tcon0_mode_set_dithering(struct sun4i_tcon *tcon, const struct drm_connector *connector) { @@ -367,10 +355,18 @@ static void sun4i_tcon0_mode_set_cpu(struct sun4i_tco= n *tcon, u32 block_space, start_delay; u32 tcon_div; =20 + /* + * dclk is required to run at 1/4 the DSI per-lane bit rate. + */ tcon->dclk_min_div =3D SUN6I_DSI_TCON_DIV; tcon->dclk_max_div =3D SUN6I_DSI_TCON_DIV; + clk_set_rate(tcon->dclk, mode->crtc_clock * 1000 * (bpp / lanes) + / SUN6I_DSI_TCON_DIV); =20 - sun4i_tcon0_mode_set_common(tcon, mode); + /* Set the resolution */ + regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, + SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | + SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); =20 /* Set dithering if needed */ sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); @@ -438,7 +434,12 @@ static void sun4i_tcon0_mode_set_lvds(struct sun4i_tco= n *tcon, =20 tcon->dclk_min_div =3D 7; tcon->dclk_max_div =3D 7; - sun4i_tcon0_mode_set_common(tcon, mode); + clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); + + /* Set the resolution */ + regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, + SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | + SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); =20 /* Set dithering if needed */ sun4i_tcon0_mode_set_dithering(tcon, sun4i_tcon_get_connector(encoder)); @@ -515,7 +516,12 @@ static void sun4i_tcon0_mode_set_rgb(struct sun4i_tcon= *tcon, =20 tcon->dclk_min_div =3D tcon->quirks->dclk_min_div; tcon->dclk_max_div =3D 127; - sun4i_tcon0_mode_set_common(tcon, mode); + clk_set_rate(tcon->dclk, mode->crtc_clock * 1000); + + /* Set the resolution */ + regmap_write(tcon->regs, SUN4I_TCON0_BASIC0_REG, + SUN4I_TCON0_BASIC0_X(mode->crtc_hdisplay) | + SUN4I_TCON0_BASIC0_Y(mode->crtc_vdisplay)); =20 /* Set dithering if needed */ sun4i_tcon0_mode_set_dithering(tcon, connector); --=20 2.32.0 (Apple Git-132)