From patchwork Mon Nov 21 09:42:30 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlo Caione X-Patchwork-Id: 13050541 X-Patchwork-Delegate: neil.armstrong@linaro.org 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 A786AC4332F for ; Mon, 21 Nov 2022 09:43:11 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:Cc:To:In-Reply-To:References:Message-Id :MIME-Version:Subject:Date:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=tztbwfmxPgPNdVX+gAVouDv73K2+f108Q68ZvB1Gbh4=; b=KAtMMpKYkBgCY6 39J7tAu6mfs51fTAvAqJ7OIS/gE1Q03v9ZK/HvHp6tvndy76gKAPhsvKG/dWStlGX5A39/jNg9+A0 t6tpIwh7Vfa+g0T9A+bbTAwNE0LPp4JYwg5hY2OeXjo1xaskM3kiR48Zp9xEtHQuu80ffmaIeP/Nu E8YPzJ+aXq/0Zp3l7bHqBdGeINN7VtL03yz0Pbvbx7D8uQhgBwwDDvT+LsGAJGcVFQIgKnjUMF3Jy gTyG5gobk3VOwlHDyOh5A/4h5Nj1zPx+hQt7OzSrdIxgDauJG8vGKnsLsHIithid8/LFTdK0aeZGA /2p7gL0hOhRsAVubhjPw==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1ox3KH-00Buf8-Hj; Mon, 21 Nov 2022 09:42:53 +0000 Received: from mail-ej1-x62a.google.com ([2a00:1450:4864:20::62a]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1ox3K6-00BuVb-9b for linux-amlogic@lists.infradead.org; Mon, 21 Nov 2022 09:42:45 +0000 Received: by mail-ej1-x62a.google.com with SMTP id n12so27080638eja.11 for ; Mon, 21 Nov 2022 01:42:41 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=baylibre-com.20210112.gappssmtp.com; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:from:to:cc:subject:date:message-id :reply-to; bh=kplxU2lR5aG0mBiBv43tp2KK14DvgQ3747TCEeV3JMg=; b=cq8m6/mJPVrF19T4WTdu7gvq/nVLWRDjsh13J+Xr+Nn2iF4Hy9OD9nI54bY967FWG/ 3UOVhClJW4x4n2d97tfeDtKj/uthmhp699BqkgzMipcAj7tJSDny5vG9BdCLomnktnEj JLHLZjM0+76mx9DOq+ZPhDpQbUs1EjdA5A8QskH4ttK1DQdid4KKDe5WnlGyued2Rstr Jr5nh/9uT/4QkkPRzvI8bD+mOl9SVJHzqYG1WEKJvRVndpiMXm7cxc7b5miDOmV6Uxx4 nj86LC1IOU+6NmDxVUZhIhYSv6YkCgpUu0klxQEKrS1S9MHECaNaSDIhEyK/W8FZe9Tk t+cg== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20210112; h=cc:to:in-reply-to:references:message-id:content-transfer-encoding :mime-version:subject:date:from:x-gm-message-state:from:to:cc :subject:date:message-id:reply-to; bh=kplxU2lR5aG0mBiBv43tp2KK14DvgQ3747TCEeV3JMg=; b=5iSPFIfl3WnsWc7dUwv/MwlohBLbg3MWKAScFRWaEIYYjEoNDZMKT3QwLYX1q7fpHe wDLCA+3Wytf6lPhoG/gN6QD110WvgJ1XgiRMKRbiqKUq3vQL2Nx/EJrdBAOgjbDn6iXI wmhhRCOrC3Ax5MBzTxK2Dd6webT3VoWNQykfjW7YsnYpOLaFV1L34tO2Ys0x+pR6KTQY hD2SsltPBxJ5KBCzgqeMUvDj0hjj/CSGt0JKAOsLxT7IUmcz0jOniqPi7nsxCidP/shW oma+7T2Qi/trMKzbaUqPJVCW+cRAaSn3t/7fSP+wJBzumZ3T1LHh4g6uOGyzKO9xQOFf MqNA== X-Gm-Message-State: ANoB5pnFEeinkpVK5msbBWcIpwutSA6B3lvmzwRkqYRS4Z81LkAO1GFz xOhRR8drLj2we2dis9ATwsbppA== X-Google-Smtp-Source: AA0mqf4iGDXMlAJ1h8pqCDx2Am2EQUjsXM5qy6Z6ikSWJyeR7/x1T5VoUQJXLLJdiXSkQzAYW6nAog== X-Received: by 2002:a17:906:a259:b0:7ad:ccae:a30d with SMTP id bi25-20020a170906a25900b007adccaea30dmr15189830ejb.704.1669023760591; Mon, 21 Nov 2022 01:42:40 -0800 (PST) Received: from [127.0.1.1] ([2a0e:41a:894f:0:c97f:bc5d:82d3:1a3b]) by smtp.gmail.com with ESMTPSA id k11-20020a17090632cb00b0078d3f96d293sm4822240ejk.30.2022.11.21.01.42.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 21 Nov 2022 01:42:39 -0800 (PST) From: Carlo Caione Date: Mon, 21 Nov 2022 10:42:30 +0100 Subject: [PATCH v2 1/2] drm/tiny: rpi-lcd-35: Enable driver module autoloading MIME-Version: 1.0 Message-Id: <20221116-s905x_spi_ili9486-v2-1-084c6e3cd930@baylibre.com> References: <20221116-s905x_spi_ili9486-v2-0-084c6e3cd930@baylibre.com> In-Reply-To: <20221116-s905x_spi_ili9486-v2-0-084c6e3cd930@baylibre.com> To: Mark Brown , Daniel Vetter , David Airlie , Martin Blumenstingl , Kevin Hilman , Kamlesh Gurudasani , Jerome Brunet , Neil Armstrong Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, Carlo Caione X-Mailer: b4 0.10.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221121_014242_349101_4573E5EC X-CRM114-Status: UNSURE ( 8.47 ) X-CRM114-Notice: Please train this message. X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org SPI devices use the spi_device_id for module autoloading even on systems using device tree. Add the spi_device_id entry to enable autoloading for the 3.5inch RPi Display (rpi-lcd-35). Signed-off-by: Carlo Caione Reviewed-by: Neil Armstrong --- drivers/gpu/drm/tiny/ili9486.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/gpu/drm/tiny/ili9486.c b/drivers/gpu/drm/tiny/ili9486.c index 1bb847466b10..bd37dfe8dd05 100644 --- a/drivers/gpu/drm/tiny/ili9486.c +++ b/drivers/gpu/drm/tiny/ili9486.c @@ -183,6 +183,7 @@ MODULE_DEVICE_TABLE(of, ili9486_of_match); static const struct spi_device_id ili9486_id[] = { { "ili9486", 0 }, + { "rpi-lcd-35", 0 }, { } }; MODULE_DEVICE_TABLE(spi, ili9486_id); From patchwork Mon Nov 21 09:42:31 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Carlo Caione X-Patchwork-Id: 13050543 X-Patchwork-Delegate: neil.armstrong@linaro.org 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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 8DDB1C4332F for ; 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Mon, 21 Nov 2022 01:42:41 -0800 (PST) From: Carlo Caione Date: Mon, 21 Nov 2022 10:42:31 +0100 Subject: [PATCH v2 2/2] drm/tiny: ili9486: Do not assume 8-bit only SPI controllers MIME-Version: 1.0 Message-Id: <20221116-s905x_spi_ili9486-v2-2-084c6e3cd930@baylibre.com> References: <20221116-s905x_spi_ili9486-v2-0-084c6e3cd930@baylibre.com> In-Reply-To: <20221116-s905x_spi_ili9486-v2-0-084c6e3cd930@baylibre.com> To: Mark Brown , Daniel Vetter , David Airlie , Martin Blumenstingl , Kevin Hilman , Kamlesh Gurudasani , Jerome Brunet , Neil Armstrong Cc: dri-devel@lists.freedesktop.org, linux-arm-kernel@lists.infradead.org, linux-amlogic@lists.infradead.org, linux-kernel@vger.kernel.org, Carlo Caione X-Mailer: b4 0.10.1 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221121_094244_455153_51DBC236 X-CRM114-Status: GOOD ( 19.50 ) X-BeenThere: linux-amlogic@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-amlogic" Errors-To: linux-amlogic-bounces+linux-amlogic=archiver.kernel.org@lists.infradead.org The pixel data for the ILI9486 is always 16-bits wide and it must be sent over the SPI bus. When the controller is only able to deal with 8-bit transfers, this 16-bits data needs to be swapped before the sending to account for the big endian bus, this is on the contrary not needed when the SPI controller already supports 16-bits transfers. The decision about swapping the pixel data or not is taken in the MIPI DBI code by probing the controller capabilities: if the controller only suppors 8-bit transfers the data is swapped, otherwise it is not. This swapping/non-swapping is relying on the assumption that when the controller does support 16-bit transactions then the data is sent unswapped in 16-bits-per-word over SPI. The problem with the ILI9486 driver is that it is forcing 8-bit transactions also for controllers supporting 16-bits, violating the assumption and corrupting the pixel data. Align the driver to what is done in the MIPI DBI code by adjusting the tranfer size to the maximum allowed by the SPI controller. Signed-off-by: Carlo Caione Reviewed-by: Neil Armstrong --- drivers/gpu/drm/tiny/ili9486.c | 13 +++++++++---- 1 file changed, 9 insertions(+), 4 deletions(-) diff --git a/drivers/gpu/drm/tiny/ili9486.c b/drivers/gpu/drm/tiny/ili9486.c index bd37dfe8dd05..4d80a413338f 100644 --- a/drivers/gpu/drm/tiny/ili9486.c +++ b/drivers/gpu/drm/tiny/ili9486.c @@ -43,6 +43,7 @@ static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par, size_t num) { struct spi_device *spi = mipi->spi; + unsigned int bpw = 8; void *data = par; u32 speed_hz; int i, ret; @@ -56,8 +57,6 @@ static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par, * The displays are Raspberry Pi HATs and connected to the 8-bit only * SPI controller, so 16-bit command and parameters need byte swapping * before being transferred as 8-bit on the big endian SPI bus. - * Pixel data bytes have already been swapped before this function is - * called. */ buf[0] = cpu_to_be16(*cmd); gpiod_set_value_cansleep(mipi->dc, 0); @@ -71,12 +70,18 @@ static int waveshare_command(struct mipi_dbi *mipi, u8 *cmd, u8 *par, for (i = 0; i < num; i++) buf[i] = cpu_to_be16(par[i]); num *= 2; - speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num); data = buf; } + /* + * Check whether pixel data bytes needs to be swapped or not + */ + if (*cmd == MIPI_DCS_WRITE_MEMORY_START && !mipi->swap_bytes) + bpw = 16; + gpiod_set_value_cansleep(mipi->dc, 1); - ret = mipi_dbi_spi_transfer(spi, speed_hz, 8, data, num); + speed_hz = mipi_dbi_spi_cmd_max_speed(spi, num); + ret = mipi_dbi_spi_transfer(spi, speed_hz, bpw, data, num); free: kfree(buf);