shinys000114/linux
1
0
Fork 0
mirror of https://github.com/hardkernel/linux.git synced 2026-06-06 10:58:48 +09:00
Code Issues Packages Projects Releases Wiki Activity

mmc: core: add argument check for cmd1

Browse Source 
According to eMMC specification v5.1 section A6.1, the R3 response
value should be 0x00FF8080, 0x40FF8080, 0x80FF8080 or 0xC0FF8080.
The EMMC device may be abnormal if a wrong OCR data is configured.

Signed-off-by: Yifeng Zhao <yifeng.zhao@rock-chips.com>
Change-Id: I5b19c0a937b55dc75e9d1abf7f9c8cf9a5d083b5
This commit is contained in:
Yifeng Zhao
2021-12-22 18:09:40 +08:00
committed by Tao Huang
parent 44f46d2c06
commit 69da1839de
1 changed files with 9 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

9
drivers/mmc/core/mmc_ops.c
View File

@@ -184,6 +184,15 @@ int mmc_send_op_cond(struct mmc_host *host, u32 ocr, u32 *rocr)
if (err)
break;
/*
* According to eMMC specification v5.1 section A6.1, the R3
* response value should be 0x00FF8080, 0x40FF8080, 0x80FF8080
* or 0xC0FF8080. The EMMC device may be abnormal if a wrong
* OCR data is configured.
*/
if ((cmd.resp[0] & 0xFFFFFF) != 0x00FF8080)
continue;
/* wait until reset completes */
if (mmc_host_is_spi(host)) {
if (!(cmd.resp[0] & R1_SPI_IDLE))