summaryrefslogtreecommitdiff
path: root/drivers/mmc/host/rtsx_pci_sdmmc.c
diff options
context:
space:
mode:
authorRoger Tseng <rogerable@realtek.com>2014-08-15 14:06:00 +0800
committerUlf Hansson <ulf.hansson@linaro.org>2014-09-09 13:59:01 +0200
commitd1419d50c1bf711e9fd27b516a739c86b23f7cf9 (patch)
treef132bc99fea470f40582995f3cc4b3f6c3de11b5 /drivers/mmc/host/rtsx_pci_sdmmc.c
parentee9d19d42c6b30e464a4c748654582fc6b3ff853 (diff)
mmc: rtsx_pci_sdmmc: fix incorrect last byte in R2 response
Current code erroneously fill the last byte of R2 response with an undefined value. In addition, the controller actually 'offloads' the last byte (CRC7, end bit) while receiving R2 response and thus it's impossible to get the actual value. This could cause mmc stack to obtain inconsistent CID from the same card after resume and misidentify it as a different card. Fix by assigning dummy CRC and end bit: {7'b0, 1} = 0x1 to the last byte of R2. Cc: <stable@vger.kernel.org> # v3.8+ Fixes: ff984e57d36e ("mmc: Add realtek pcie sdmmc host driver") Signed-off-by: Roger Tseng <rogerable@realtek.com> Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/rtsx_pci_sdmmc.c')
-rw-r--r--drivers/mmc/host/rtsx_pci_sdmmc.c7
1 files changed, 7 insertions, 0 deletions
diff --git a/drivers/mmc/host/rtsx_pci_sdmmc.c b/drivers/mmc/host/rtsx_pci_sdmmc.c
index dfde4a210238..b2537e2f26b1 100644
--- a/drivers/mmc/host/rtsx_pci_sdmmc.c
+++ b/drivers/mmc/host/rtsx_pci_sdmmc.c
@@ -412,6 +412,13 @@ static void sd_send_cmd_get_rsp(struct realtek_pci_sdmmc *host,
}
if (rsp_type == SD_RSP_TYPE_R2) {
+ /*
+ * The controller offloads the last byte {CRC-7, end bit 1'b1}
+ * of response type R2. Assign dummy CRC, 0, and end bit to the
+ * byte(ptr[16], goes into the LSB of resp[3] later).
+ */
+ ptr[16] = 1;
+
for (i = 0; i < 4; i++) {
cmd->resp[i] = get_unaligned_be32(ptr + 1 + i * 4);
dev_dbg(sdmmc_dev(host), "cmd->resp[%d] = 0x%08x\n",