aboutsummaryrefslogtreecommitdiffstats
path: root/target/linux/brcm2708/patches-4.14/950-0434-mmc-bcm2835-Recover-from-MMC_SEND_EXT_CSD.patch
diff options
context:
space:
mode:
Diffstat (limited to 'target/linux/brcm2708/patches-4.14/950-0434-mmc-bcm2835-Recover-from-MMC_SEND_EXT_CSD.patch')
-rw-r--r--target/linux/brcm2708/patches-4.14/950-0434-mmc-bcm2835-Recover-from-MMC_SEND_EXT_CSD.patch50
1 files changed, 0 insertions, 50 deletions
diff --git a/target/linux/brcm2708/patches-4.14/950-0434-mmc-bcm2835-Recover-from-MMC_SEND_EXT_CSD.patch b/target/linux/brcm2708/patches-4.14/950-0434-mmc-bcm2835-Recover-from-MMC_SEND_EXT_CSD.patch
deleted file mode 100644
index 9a9e811038..0000000000
--- a/target/linux/brcm2708/patches-4.14/950-0434-mmc-bcm2835-Recover-from-MMC_SEND_EXT_CSD.patch
+++ /dev/null
@@ -1,50 +0,0 @@
-From c2eae29f6503cf29ac6a204c51132cfed33d203e Mon Sep 17 00:00:00 2001
-From: Phil Elwell <phil@raspberrypi.org>
-Date: Fri, 26 Oct 2018 17:40:44 +0100
-Subject: [PATCH 434/454] mmc/bcm2835: Recover from MMC_SEND_EXT_CSD
-
-If the user issues an "mmc extcsd read", the SD controller receives
-what it thinks is a SEND_IF_COND command with an unexpected data block.
-The resulting operations leave the FSM stuck in READWAIT, a state which
-persists until the MMC framework resets the controller, by which point
-the root filesystem is likely to have been unmounted.
-
-A less heavyweight solution is to detect the condition and nudge the
-FSM by asserting the (self-clearing) FORCE_DATA_MODE bit.
-
-N.B. This workaround was essentially discovered by accident and without
-a full understanding the inner workings of the controller, so it is
-fortunate that the "fix" only modifies error paths.
-
-See: https://github.com/raspberrypi/linux/issues/2728
-
-Signed-off-by: Phil Elwell <phil@raspberrypi.org>
----
- drivers/mmc/host/bcm2835.c | 9 +++++++++
- 1 file changed, 9 insertions(+)
-
---- a/drivers/mmc/host/bcm2835.c
-+++ b/drivers/mmc/host/bcm2835.c
-@@ -772,6 +772,8 @@ static void bcm2835_finish_command(struc
-
- if (!(sdhsts & SDHSTS_CRC7_ERROR) ||
- (host->cmd->opcode != MMC_SEND_OP_COND)) {
-+ u32 edm, fsm;
-+
- if (sdhsts & SDHSTS_CMD_TIME_OUT) {
- host->cmd->error = -ETIMEDOUT;
- } else {
-@@ -780,6 +782,13 @@ static void bcm2835_finish_command(struc
- bcm2835_dumpregs(host);
- host->cmd->error = -EILSEQ;
- }
-+ edm = readl(host->ioaddr + SDEDM);
-+ fsm = edm & SDEDM_FSM_MASK;
-+ if (fsm == SDEDM_FSM_READWAIT ||
-+ fsm == SDEDM_FSM_WRITESTART1)
-+ /* Kick the FSM out of its wait */
-+ writel(edm | SDEDM_FORCE_DATA_MODE,
-+ host->ioaddr + SDEDM);
- bcm2835_finish_request(host);
- return;
- }