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[144.168.56.201]) by smtp.gmail.com with ESMTPSA id jx4sm13519070pjb.24.2021.01.10.00.15.27 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 10 Jan 2021 00:15:29 -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 v4 6/6] hw/ssi: imx_spi: Correct tx and rx fifo endianness Date: Sun, 10 Jan 2021 16:14:29 +0800 Message-Id: <20210110081429.10126-7-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20210110081429.10126-1-bmeng.cn@gmail.com> References: <20210110081429.10126-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::633; envelope-from=bmeng.cn@gmail.com; helo=mail-pl1-x633.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+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" 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. => 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 --- (no changes since v3) 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 47c8a0f572..b5124a6426 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) while (!fifo32_is_empty(&s->tx_fifo)) { int tx_burst = 0; - int index = 0; if (s->burst_length <= 0) { s->burst_length = imx_spi_burst_length(s); @@ -192,7 +191,7 @@ static void imx_spi_flush_txfifo(IMXSPIState *s) rx = 0; while (tx_burst > 0) { - uint8_t byte = tx & 0xff; + uint8_t byte = tx >> (tx_burst - 8); DPRINTF("writing 0x%02x\n", (uint32_t)byte); @@ -201,13 +200,11 @@ static void imx_spi_flush_txfifo(IMXSPIState *s) DPRINTF("0x%02x read\n", (uint32_t)byte); - tx = tx >> 8; - rx |= (byte << (index * 8)); + rx = (rx << 8) | byte; /* Remove 8 bits from the actual burst */ tx_burst -= 8; s->burst_length -= 8; - index++; } DPRINTF("data rx:0x%08x\n", rx); -- 2.25.1