From mboxrd@z Thu Jan 1 00:00:00 1970 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 gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id C7935C27C79 for ; Thu, 20 Jun 2024 06:43:11 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0698A10E2B8; Thu, 20 Jun 2024 06:43:11 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (1024-bit key; unprotected) header.d=ideasonboard.com header.i=@ideasonboard.com header.b="PhIIjMHS"; dkim-atps=neutral Received: from perceval.ideasonboard.com (perceval.ideasonboard.com [213.167.242.64]) by gabe.freedesktop.org (Postfix) with ESMTPS id 5B8D410E2B8 for ; Thu, 20 Jun 2024 06:43:10 +0000 (UTC) Received: from [192.168.88.20] (91-158-144-210.elisa-laajakaista.fi [91.158.144.210]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 2B6C366F; Thu, 20 Jun 2024 08:42:50 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1718865770; bh=qWturLnSem+nd6L24Z/fiAlf2fGYnIsd+lI0twPMfMo=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=PhIIjMHSW65Tfqx/f89Rn7d2g24nCNUHz0TQm3768BxvGU0ejFj13I3HapF2HrOai Y4RPZWJLIC8eSTZyPVeOosZ9alKuXpyBPH6Yu2y9iLj+jC7E6smOxg2exc+5woBbAI fPSVET35XXL0h6OMa/Z3Lv4CNglE5WiMYBM+dj3k= Message-ID: <404691d2-b013-4bcc-b7e4-bcc809e4bfbb@ideasonboard.com> Date: Thu, 20 Jun 2024 09:43:05 +0300 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 2/4] drm: ti-sn65dsi86: Check bridge connection failure To: Laurent Pinchart , Jacopo Mondi Cc: Kieran Bingham , David Airlie , Daniel Vetter , "open list:DRM DRIVERS FOR RENESAS R-CAR" , "open list:DRM DRIVERS FOR RENESAS R-CAR" , Phong Hoang References: <20240619102219.138927-1-jacopo.mondi@ideasonboard.com> <20240619102219.138927-3-jacopo.mondi@ideasonboard.com> <20240619193258.GC31507@pendragon.ideasonboard.com> From: Tomi Valkeinen Content-Language: en-US Autocrypt: addr=tomi.valkeinen@ideasonboard.com; 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charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" On 19/06/2024 22:32, Laurent Pinchart wrote: > Hi Jacopo, > > Thank you for the patch. > > On Wed, Jun 19, 2024 at 12:22:16PM +0200, Jacopo Mondi wrote: >> From: Phong Hoang >> >> Add a check to the register access function when attaching a bridge >> device. I think the desc is missing the "why". I'm guessing it's the first register access to the IC, and thus verifies that it is accessible. Tomi >> >> Signed-off-by: Phong Hoang >> Signed-off-by: Jacopo Mondi > > Reviewed-by: Laurent Pinchart > >> --- >> drivers/gpu/drm/bridge/ti-sn65dsi86.c | 6 +++++- >> 1 file changed, 5 insertions(+), 1 deletion(-) >> >> diff --git a/drivers/gpu/drm/bridge/ti-sn65dsi86.c b/drivers/gpu/drm/bridge/ti-sn65dsi86.c >> index 84698a0b27a8..b7df53577987 100644 >> --- a/drivers/gpu/drm/bridge/ti-sn65dsi86.c >> +++ b/drivers/gpu/drm/bridge/ti-sn65dsi86.c >> @@ -696,6 +696,7 @@ static struct ti_sn65dsi86 *bridge_to_ti_sn65dsi86(struct drm_bridge *bridge) >> >> static int ti_sn_attach_host(struct auxiliary_device *adev, struct ti_sn65dsi86 *pdata) >> { >> + int ret; >> int val; >> struct mipi_dsi_host *host; >> struct mipi_dsi_device *dsi; >> @@ -720,8 +721,11 @@ static int ti_sn_attach_host(struct auxiliary_device *adev, struct ti_sn65dsi86 >> >> /* check if continuous dsi clock is required or not */ >> pm_runtime_get_sync(dev); >> - regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val); >> + ret = regmap_read(pdata->regmap, SN_DPPLL_SRC_REG, &val); >> pm_runtime_put_autosuspend(dev); >> + if (ret) >> + return ret; >> + >> if (!(val & DPPLL_CLK_SRC_DSICLK)) >> dsi->mode_flags |= MIPI_DSI_CLOCK_NON_CONTINUOUS; >> >