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[144.168.56.201]) by smtp.gmail.com with ESMTPSA id b10sm12840748pgh.15.2021.01.09.04.36.28 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 09 Jan 2021 04:36:31 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references :mime-version:content-transfer-encoding; bh=mG1MTXK9dNCfs7Rn1MWcFj8sMscSVuyy26GcmnPOYdM=; b=pcYzFWX0Y0ahryzO4n3aYv78WToGnijRSHa/OoRZPdYNXUL1VhvMQXJvTCphAIo6E4 IqBXKb/89RvHo3zlXgrdbqOkn16bSwX0yopprU/52ph/rnwyAQm/BMY1kYjpvyXpj+8Z qcBxSNUn9460CiE0VEzGgHkDgWjqOGKu/4EUkUB0AWRaLyC9vmnTiWReCWl6SoBb4PB6 JZfNb6mI+DKuRUhUdUTN4meXS0+IJ7xHx8ZYQtMqzGaAqwWAi6fhaT7HDb8Xc0FXKyNh t8fsjJzOqjNVW0w6YmQbw2Wh15xd03yzW7fvmtYP3TJKbJZ8x344hh04yuyQVqU8yp3T k5KQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=mG1MTXK9dNCfs7Rn1MWcFj8sMscSVuyy26GcmnPOYdM=; b=jsjoHXgSaZEsKRgLGASAMYixeJcISiqthjDUPS9NiMSfWiW/OaKudHrnQHIXvouaCQ axTPRqhy5o5AzDi5Hswgj7EFpE78UaZmNm5vxz+she2CTLpCI8KBMn5S2v+lehkwM14y CjaseVQIg6v/tsYtiZ7Z9ZSzWgIJNc5ySS9fE8wdRemvexgzoJT0Fng7U5XqL3DWKpht BKYbcQLFdr3anmbPysVtRfngYpRwu1JwGvX+275dcQrd5a4V9oF58u235aJ89dVbBTDG cLXpdy9ub+GJhYJfmxn/6EwRrLV3DYMRaTuKXOUn2hMpG7NP2/oq8NGW16eOFMCBctQ0 We+g== X-Gm-Message-State: AOAM531AszTHEmJpyBCA8y/TSrDsc6XpVdJwgf9Cyi4denkOtpn/O/M8 US5UgVZ9aoAVHJ00E5LBxwra5a790Ho= X-Google-Smtp-Source: ABdhPJyttpSoLeyDjOMY0mGkKPkD6qFK0H+opSslOdu+Wuk3ZZaxf4oNcu//OPxxQgkal6Ju2z0ouA== X-Received: by 2002:a63:1d59:: with SMTP id d25mr11322861pgm.259.1610195792482; Sat, 09 Jan 2021 04:36:32 -0800 (PST) From: Bin Meng To: Peter Maydell , Jean-Christophe Dubois , Alistair Francis , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , qemu-arm@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH v3 6/6] hw/ssi: imx_spi: Correct tx and rx fifo endianness Date: Sat, 9 Jan 2021 20:35:45 +0800 Message-Id: <20210109123545.12001-7-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210109123545.12001-1-bmeng.cn@gmail.com> References: <20210109123545.12001-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=2607:f8b0:4864:20::42a; envelope-from=bmeng.cn@gmail.com; helo=mail-pf1-x42a.google.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Bin Meng Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @gmail.com) Content-Type: text/plain; charset="utf-8" From: Bin Meng The endianness of data exchange between tx and rx fifo is incorrect. Earlier bytes are supposed to show up on MSB and later bytes on LSB, ie: in big endian. The manual does not explicitly say this, but the U-Boot and Linux driver codes have a swap on the data transferred to tx fifo and from rx fifo. With this change, U-Boot read from / write to SPI flash tests pass. =3D> sf test 1ff000 1000 SPI flash test: 0 erase: 0 ticks, 4096000 KiB/s 32768.000 Mbps 1 check: 3 ticks, 1333 KiB/s 10.664 Mbps 2 write: 235 ticks, 17 KiB/s 0.136 Mbps 3 read: 2 ticks, 2000 KiB/s 16.000 Mbps Test passed 0 erase: 0 ticks, 4096000 KiB/s 32768.000 Mbps 1 check: 3 ticks, 1333 KiB/s 10.664 Mbps 2 write: 235 ticks, 17 KiB/s 0.136 Mbps 3 read: 2 ticks, 2000 KiB/s 16.000 Mbps Fixes: c906a3a01582 ("i.MX: Add the Freescale SPI Controller") Signed-off-by: Bin Meng --- Changes in v3: - Simplify the tx fifo endianness handling hw/ssi/imx_spi.c | 7 ++----- 1 file changed, 2 insertions(+), 5 deletions(-) diff --git a/hw/ssi/imx_spi.c b/hw/ssi/imx_spi.c index 68a32b689e..a81242e860 100644 --- a/hw/ssi/imx_spi.c +++ b/hw/ssi/imx_spi.c @@ -171,7 +171,6 @@ static void imx_spi_flush_txfifo(IMXSPIState *s) =20 while (!fifo32_is_empty(&s->tx_fifo)) { int tx_burst =3D 0; - int index =3D 0; =20 if (s->burst_length <=3D 0) { s->burst_length =3D imx_spi_burst_length(s); @@ -192,7 +191,7 @@ static void imx_spi_flush_txfifo(IMXSPIState *s) rx =3D 0; =20 while (tx_burst > 0) { - uint8_t byte =3D tx & 0xff; + uint8_t byte =3D tx >> (tx_burst - 8); =20 DPRINTF("writing 0x%02x\n", (uint32_t)byte); =20 @@ -201,13 +200,11 @@ static void imx_spi_flush_txfifo(IMXSPIState *s) =20 DPRINTF("0x%02x read\n", (uint32_t)byte); =20 - tx =3D tx >> 8; - rx |=3D (byte << (index * 8)); + rx =3D (rx << 8) | byte; =20 /* Remove 8 bits from the actual burst */ tx_burst -=3D 8; s->burst_length -=3D 8; - index++; } =20 DPRINTF("data rx:0x%08x\n", rx); --=20 2.25.1