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[144.168.56.201]) by smtp.gmail.com with ESMTPSA id t23sm45957591pfc.0.2020.12.31.03.30.46 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 31 Dec 2020 03:30:48 -0800 (PST) From: Bin Meng To: =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Alistair Francis , qemu-block@nongnu.org, qemu-riscv@nongnu.org, qemu-devel@nongnu.org Subject: [PATCH 07/22] hw/sd: ssi-sd: Suffix a data block with CRC16 Date: Thu, 31 Dec 2020 19:29:55 +0800 Message-Id: <20201231113010.27108-8-bmeng.cn@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20201231113010.27108-1-bmeng.cn@gmail.com> References: <20201231113010.27108-1-bmeng.cn@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Received-SPF: pass client-ip=2607:f8b0:4864:20::52a; envelope-from=bmeng.cn@gmail.com; helo=mail-pg1-x52a.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 Per the SD spec, a valid data block is suffixed with a 16-bit CRC generated by the standard CCITT polynomial x16+x12+x5+1. This part is currently missing in the ssi-sd state machine. Without it, all data block transfer fails in guest software because the expected CRC16 is missing on the data out line. Fixes: 775616c3ae8c ("Partial SD card SPI mode support") Signed-off-by: Bin Meng --- hw/sd/ssi-sd.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/hw/sd/ssi-sd.c b/hw/sd/ssi-sd.c index 228ce4ddc7..10b0ac2eaf 100644 --- a/hw/sd/ssi-sd.c +++ b/hw/sd/ssi-sd.c @@ -17,6 +17,7 @@ #include "hw/qdev-properties.h" #include "hw/sd/sd.h" #include "qapi/error.h" +#include "qemu/crc-ccitt.h" #include "qemu/module.h" #include "qom/object.h" @@ -40,6 +41,7 @@ typedef enum { SSI_SD_RESPONSE, SSI_SD_DATA_START, SSI_SD_DATA_READ, + SSI_SD_DATA_CRC16, } ssi_sd_mode; struct ssi_sd_state { @@ -48,6 +50,7 @@ struct ssi_sd_state { int cmd; uint8_t cmdarg[4]; uint8_t response[5]; + uint16_t crc16; int32_t arglen; int32_t response_pos; int32_t stopping; @@ -193,12 +196,24 @@ static uint32_t ssi_sd_transfer(SSIPeripheral *dev, uint32_t val) case SSI_SD_DATA_START: DPRINTF("Start read block\n"); s->mode = SSI_SD_DATA_READ; + s->response_pos = 0; return 0xfe; case SSI_SD_DATA_READ: val = sdbus_read_byte(&s->sdbus); + s->crc16 = crc_ccitt_false(s->crc16, (uint8_t *)&val, 1); if (!sdbus_data_ready(&s->sdbus)) { DPRINTF("Data read end\n"); + s->mode = SSI_SD_DATA_CRC16; + } + return val; + case SSI_SD_DATA_CRC16: + val = (s->crc16 & 0xff00) >> 8; + s->crc16 <<= 8; + s->response_pos++; + if (s->response_pos == 2) { + DPRINTF("CRC16 read end\n"); s->mode = SSI_SD_CMD; + s->response_pos = 0; } return val; } @@ -236,6 +251,7 @@ static const VMStateDescription vmstate_ssi_sd = { VMSTATE_INT32(cmd, ssi_sd_state), VMSTATE_UINT8_ARRAY(cmdarg, ssi_sd_state, 4), VMSTATE_UINT8_ARRAY(response, ssi_sd_state, 5), + VMSTATE_UINT16(crc16, ssi_sd_state), VMSTATE_INT32(arglen, ssi_sd_state), VMSTATE_INT32(response_pos, ssi_sd_state), VMSTATE_INT32(stopping, ssi_sd_state), @@ -287,6 +303,7 @@ static void ssi_sd_reset(DeviceState *dev) s->cmd = 0; memset(s->cmdarg, 0, sizeof(s->cmdarg)); memset(s->response, 0, sizeof(s->response)); + s->crc16 = 0; s->arglen = 0; s->response_pos = 0; s->stopping = 0; -- 2.25.1