From patchwork Thu Mar 31 15:05:09 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Marek Vasut X-Patchwork-Id: 12797217 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 9B74FC433F5 for ; Thu, 31 Mar 2022 15:06:24 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 0C0B710F38B; Thu, 31 Mar 2022 15:06:24 +0000 (UTC) Received: from phobos.denx.de (phobos.denx.de [IPv6:2a01:238:438b:c500:173d:9f52:ddab:ee01]) by gabe.freedesktop.org (Postfix) with ESMTPS id D146810F33B for ; Thu, 31 Mar 2022 15:05:54 +0000 (UTC) Received: from tr.lan (ip-89-176-112-137.net.upcbroadband.cz [89.176.112.137]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits)) (No client certificate requested) (Authenticated sender: marex@denx.de) by phobos.denx.de (Postfix) with ESMTPSA id 3C7A684220; Thu, 31 Mar 2022 17:05:53 +0200 (CEST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=denx.de; s=phobos-20191101; t=1648739153; bh=xNzxO+zg7ESrCp4Ajzh1ZsGKxjqULvXpM0YuwgxojoU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lpqj+T0fR1o2tGF/wdPpgnVP/TaBDx2zzNOhPono74QGA80BXOw0GoHU62k6WpgC/ JwGJ3o3pYNGNuzXzxtuc05tk3EQIYe0PWN35xAJnJWN19u0UY8qRFVMz8kKUA5v3lG H5V2OXKDL+nqZwFaDiwygktfPVPLB4ejRReEsXjkgwUqV/s6kcmbZwoFizhS/EGm4C loa53thx/nkrbhxeUwpkCSR7FfXBiGP29XzO1c4un4w/sm/IUlLOm9q/EAE4BXEj3y wHyln5jHFLklAEewXaQoagEwGWUyisnuQ1sg9MICtIrTnkz2mR2WjktjdDtFcVShtY 3bfRaiSs1i3fg== From: Marek Vasut To: dri-devel@lists.freedesktop.org Subject: [PATCH v6 11/11] drm: bridge: icn6211: Read and validate chip IDs before configuration Date: Thu, 31 Mar 2022 17:05:09 +0200 Message-Id: <20220331150509.9838-12-marex@denx.de> X-Mailer: git-send-email 2.35.1 In-Reply-To: <20220331150509.9838-1-marex@denx.de> References: <20220331150509.9838-1-marex@denx.de> MIME-Version: 1.0 X-Virus-Scanned: clamav-milter 0.103.5 at phobos.denx.de X-Virus-Status: Clean 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: , Cc: Marek Vasut , Robert Foss , Maxime Ripard , Thomas Zimmermann , Sam Ravnborg , Jagan Teki Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" Read out the Vendor/Chip/Version ID registers from the chip before performing any configuration, and validate that the registers have correct values. This is mostly a simple test whether DSI register access does work, since that tends to be broken on various bridges. Acked-by: Maxime Ripard Signed-off-by: Marek Vasut Cc: Jagan Teki Cc: Maxime Ripard Cc: Robert Foss Cc: Sam Ravnborg Cc: Thomas Zimmermann To: dri-devel@lists.freedesktop.org --- V2: Rebase on next-20220214 V3: Add AB from Maxime V4: No change V5: No change V6: No change --- drivers/gpu/drm/bridge/chipone-icn6211.c | 24 +++++++++++++++++++++++- 1 file changed, 23 insertions(+), 1 deletion(-) diff --git a/drivers/gpu/drm/bridge/chipone-icn6211.c b/drivers/gpu/drm/bridge/chipone-icn6211.c index f4dfb2297c71..a1bdb9be1927 100644 --- a/drivers/gpu/drm/bridge/chipone-icn6211.c +++ b/drivers/gpu/drm/bridge/chipone-icn6211.c @@ -151,6 +151,14 @@ static inline struct chipone *bridge_to_chipone(struct drm_bridge *bridge) return container_of(bridge, struct chipone, bridge); } +static void chipone_readb(struct chipone *icn, u8 reg, u8 *val) +{ + if (icn->interface_i2c) + *val = i2c_smbus_read_byte_data(icn->client, reg); + else + mipi_dsi_generic_read(icn->dsi, (u8[]){reg, 1}, 2, val, 1); +} + static int chipone_writeb(struct chipone *icn, u8 reg, u8 val) { if (icn->interface_i2c) @@ -250,7 +258,21 @@ static void chipone_atomic_enable(struct drm_bridge *bridge, const struct drm_bridge_state *bridge_state; u16 hfp, hbp, hsync; u32 bus_flags; - u8 pol; + u8 pol, id[4]; + + chipone_readb(icn, VENDOR_ID, id); + chipone_readb(icn, DEVICE_ID_H, id + 1); + chipone_readb(icn, DEVICE_ID_L, id + 2); + chipone_readb(icn, VERSION_ID, id + 3); + + dev_dbg(icn->dev, + "Chip IDs: Vendor=0x%02x Device=0x%02x:0x%02x Version=0x%02x\n", + id[0], id[1], id[2], id[3]); + + if (id[0] != 0xc1 || id[1] != 0x62 || id[2] != 0x11) { + dev_dbg(icn->dev, "Invalid Chip IDs, aborting configuration\n"); + return; + } /* Get the DPI flags from the bridge state. */ bridge_state = drm_atomic_get_new_bridge_state(state, bridge);