From nobody Sun Oct 5 18:19:12 2025 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 86DAC1C7013; Thu, 31 Jul 2025 21:07:14 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753996034; cv=none; b=h4aCUZ5jIr6MsLfHMMJ7ck73KnhS0i0NLVGiJkR+uImdkyIAR9dk4sX3ltn3wo0Kw2r5FrPlCijHaBP6FcdzwcMdjGZRlxg2EDGuqyUfXa76oGBiqD8wb+LPwDd7n+aRHCTalBEXN8PLP9WHjP7SWQYUFE56P2qLHdGszon1kgg= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1753996034; c=relaxed/simple; bh=8Wy6v2zEQbv4sE727EkXinUIUXS+RivX/F8LgeXpAlI=; h=From:Date:Subject:MIME-Version:Content-Type:Message-Id:References: In-Reply-To:To:Cc; b=JtU8hgfqjFyIKXiF6CufG6AgbAHqvXYILD+95ckZ0D57XKU9lrltjBCuKIa5wmZG26KV2ti+BFprV/jZIP7vPxVjt3F4+DBjU7I24n3hrJYgsFK43CiOwsWDhqopCB6ylXFVGQpY+xYcSVLb/gI5dzRXTqsySXcdQ9f7tup+48k= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=iQ9HW67n; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="iQ9HW67n" Received: by smtp.kernel.org (Postfix) with ESMTPS id 3571CC4AF0B; Thu, 31 Jul 2025 21:07:14 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1753996034; bh=8Wy6v2zEQbv4sE727EkXinUIUXS+RivX/F8LgeXpAlI=; h=From:Date:Subject:References:In-Reply-To:To:Cc:Reply-To:From; b=iQ9HW67n5LezlAL5uB8bjV8oaT3OfPg/1OQJYGdq4On1A9zd4NuK0iWKr6oykKtnS 6BVggUdR7YxJubu71RFRlHbgR0d6nTXHNFOZX2PnLol1yGQIjXXzqbSJ7oLwaPZeAM EpYAC7hDk2q4fZyI1AXTKpuXhoS76khA3V9UPMRvwUYtIk0lP5bZoa1otACmKOd2tK jppqJRUtw+WoVHXJeryqzFkM17xZ8zItQovAZUQVYDk35MzhCL2ipxEDyWD8MTn5N/ Set0/q3+3cwORzFNrbjCWkyHT1IfxuPBlq+Berw1isEwqUS0RK3EjFrZJD9S0EJZnt zL1g9czl5TlCA== Received: from aws-us-west-2-korg-lkml-1.web.codeaurora.org (localhost.localdomain [127.0.0.1]) by smtp.lore.kernel.org (Postfix) with ESMTP id 26BF2C87FD3; Thu, 31 Jul 2025 21:07:14 +0000 (UTC) From: David Heidelberg via B4 Relay Date: Thu, 31 Jul 2025 23:06:52 +0200 Subject: [PATCH RESEND v5 2/7] Input: synaptics-rmi4 - handle duplicate/unknown PDT entries Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Message-Id: <20250731-synaptics-rmi4-v5-2-cd0d87d34afa@ixit.cz> References: <20250731-synaptics-rmi4-v5-0-cd0d87d34afa@ixit.cz> In-Reply-To: <20250731-synaptics-rmi4-v5-0-cd0d87d34afa@ixit.cz> To: Kaustabh Chakraborty , Dmitry Torokhov , Rob Herring , Krzysztof Kozlowski , Conor Dooley , "Jason A. Donenfeld" , Matthias Schiffer , Vincent Huang Cc: linux-input@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, phone-devel@vger.kernel.org, ~postmarketos/upstreaming@lists.sr.ht, Casey Connolly , Casey Connolly , David Heidelberg X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=openpgp-sha256; l=3909; i=david@ixit.cz; h=from:subject:message-id; bh=F9hWc6iEWSUhrphcXba0Kd7/xUCyyQbMphuPjYrJ+MU=; b=owEBbQKS/ZANAwAIAWACP8TTSSByAcsmYgBoi9r/01ZjoHUNzKf1pAOvuFd4lomDhPPoItJBK N2y/6kuuv6JAjMEAAEIAB0WIQTXegnP7twrvVOnBHRgAj/E00kgcgUCaIva/wAKCRBgAj/E00kg cixZEACkkm2d9FC8rr7Yw7k+JZ7wJwukDpiDuS1GpOt7qfUuU8H8oa440noemFd0MZIljnb3MeC MuSvDH/rqKR4BSQTQ2okEEQjm/2OdpNIZkv9NzgfMHt78lUK+6MF8gwXGPjD0s/8C8rZHiyqnRD RkG3QIlx0DV5Qn+tCqooXFdTvo6yManiBoU8e6N+mHpPvQk3iIxLTg40UnJ2aRMKJMxu847cs1g dmG7/BljXVdhdT7bhf8Qkv07eZ2IbavHcs8GddWEsm4CuBEnFBk1KqBOIg8nHsUlTxe1OdFjPOx 34Ji/iDIrK0sRmXp50yi9nS+mUX4eD/RQRk1JY9nZ/OdvllJ9/qfVOxl9jw9yNbFapboX2VbMuT mlHPbECoTj54lqJv06EVveBFT3robZPBJ63XasTE3Uv16UlEZ1AilgXl2UzQ387H9mZxN3YMFIx cVMKIzfwJtu3EDKZkQ11w1Sa2cSlPH+kVAkdB6YTt7pfz2/V9cv6yMHLSN0a1d4uPnKkRlacRzw kJEMs8bhx7udi4NkVDl1bwYviW9M2Kg1j2QbpjIrrT72cu5jT2f07y07R/fwkTHZDNAjC2OFidB +r+Bl8+UY3eNWmV703KIDpDmYx3o7SUYZjgNgGVYtX7qAktGNb0vahDdec9zMDi+7n1zCjsZ3qW epD8BJjAiH8bqbg== X-Developer-Key: i=david@ixit.cz; a=openpgp; fpr=D77A09CFEEDC2BBD53A7047460023FC4D3492072 X-Endpoint-Received: by B4 Relay for david@ixit.cz/default with auth_id=355 X-Original-From: David Heidelberg Reply-To: david@ixit.cz From: Casey Connolly Some third party rmi4-compatible ICs don't expose their PDT entries very well. Add a few checks to skip duplicate entries as well as entries for unsupported functions. This is required to support some phones with third party displays. Validated on a stock OnePlus 6T (original parts): manufacturer: Synaptics, product: S3706B, fw id: 2852315 Co-developed-by: Kaustabh Chakraborty Signed-off-by: Kaustabh Chakraborty Signed-off-by: Caleb Connolly Co-developed-by: David Heidelberg Signed-off-by: David Heidelberg --- drivers/input/rmi4/rmi_driver.c | 42 +++++++++++++++++++++++++++++++++++--= ---- drivers/input/rmi4/rmi_driver.h | 8 ++++++++ 2 files changed, 44 insertions(+), 6 deletions(-) diff --git a/drivers/input/rmi4/rmi_driver.c b/drivers/input/rmi4/rmi_drive= r.c index 2168b6cd7167334d44553c9c566f870a4e034179..0f6dbe586c652d641178f43ec27= df3613126ca66 100644 --- a/drivers/input/rmi4/rmi_driver.c +++ b/drivers/input/rmi4/rmi_driver.c @@ -493,12 +493,39 @@ static void rmi_driver_copy_pdt_to_fd(const struct pd= t_entry *pdt, fd->function_version =3D pdt->function_version; } =20 +static bool rmi_pdt_entry_is_valid(struct rmi_device *rmi_dev, + struct pdt_scan_state *state, u8 fn) +{ + switch (fn) { + case 0x01: + case 0x03: + case 0x11: + case 0x12: + case 0x30: + case 0x34: + case 0x3a: + case 0x54: + case 0x55: + if (state->pdts[fn] =3D=3D true) + return false; + break; + default: + rmi_dbg(RMI_DEBUG_CORE, &rmi_dev->dev, + "PDT has unknown function number %#02x\n", fn); + return false; + } + + state->pdts[fn] =3D true; + state->pdt_count++; + return true; +} + #define RMI_SCAN_CONTINUE 0 #define RMI_SCAN_DONE 1 =20 static int rmi_scan_pdt_page(struct rmi_device *rmi_dev, int page, - int *empty_pages, + struct pdt_scan_state *state, void *ctx, int (*callback)(struct rmi_device *rmi_dev, void *ctx, @@ -521,6 +548,9 @@ static int rmi_scan_pdt_page(struct rmi_device *rmi_dev, if (RMI4_END_OF_PDT(pdt_entry.function_number)) break; =20 + if (!rmi_pdt_entry_is_valid(rmi_dev, state, pdt_entry.function_number)) + continue; + retval =3D callback(rmi_dev, ctx, &pdt_entry); if (retval !=3D RMI_SCAN_CONTINUE) return retval; @@ -531,11 +561,11 @@ static int rmi_scan_pdt_page(struct rmi_device *rmi_d= ev, * or more is found, stop scanning. */ if (addr =3D=3D pdt_start) - ++*empty_pages; + ++state->empty_pages; else - *empty_pages =3D 0; + state->empty_pages =3D 0; =20 - return (data->bootloader_mode || *empty_pages >=3D 2) ? + return (data->bootloader_mode || state->empty_pages >=3D 2) ? RMI_SCAN_DONE : RMI_SCAN_CONTINUE; } =20 @@ -544,11 +574,11 @@ int rmi_scan_pdt(struct rmi_device *rmi_dev, void *ct= x, void *ctx, const struct pdt_entry *entry)) { int page; - int empty_pages =3D 0; + struct pdt_scan_state state =3D {0, 0, {0}}; int retval =3D RMI_SCAN_DONE; =20 for (page =3D 0; page <=3D RMI4_MAX_PAGE; page++) { - retval =3D rmi_scan_pdt_page(rmi_dev, page, &empty_pages, + retval =3D rmi_scan_pdt_page(rmi_dev, page, &state, ctx, callback); if (retval !=3D RMI_SCAN_CONTINUE) break; diff --git a/drivers/input/rmi4/rmi_driver.h b/drivers/input/rmi4/rmi_drive= r.h index 3bfe9013043ef3dff46249095a5b3116c8f7d9a6..cb1cacd013a3f39db96935f705f= 18018bf15adff 100644 --- a/drivers/input/rmi4/rmi_driver.h +++ b/drivers/input/rmi4/rmi_driver.h @@ -46,6 +46,14 @@ struct pdt_entry { u8 function_number; }; =20 +#define RMI_PDT_MAX 0x55 + +struct pdt_scan_state { + u8 empty_pages; + u8 pdt_count; + bool pdts[RMI_PDT_MAX]; +}; + #define RMI_REG_DESC_PRESENSE_BITS (32 * BITS_PER_BYTE) #define RMI_REG_DESC_SUBPACKET_BITS (37 * BITS_PER_BYTE) =20 --=20 2.50.1