Author: jmcneill
Date: Tue Nov 15 23:48:30 2016
New Revision: 308705
URL: https://svnweb.freebsd.org/changeset/base/308705
Log:
On command error, reset only DMA and FIFO engines instead of the entire
controller. Fixes eMMC device detection on OrangePi Plus 2e (and likely
others).
Modified:
head/sys/arm/allwinner/a10_mmc.c
Modified: head/sys/arm/allwinner/a10_mmc.c
==============================================================================
--- head/sys/arm/allwinner/a10_mmc.c Tue Nov 15 23:46:01 2016
(r308704)
+++ head/sys/arm/allwinner/a10_mmc.c Tue Nov 15 23:48:30 2016
(r308705)
@@ -58,6 +58,7 @@ __FBSDID("$FreeBSD$");
#define A10_MMC_DMA_SEGS ((MAXPHYS / PAGE_SIZE) + 1)
#define A10_MMC_DMA_MAX_SIZE 0x2000
#define A10_MMC_DMA_FTRGLEVEL 0x20070008
+#define A10_MMC_RESET_RETRY 1000
#define CARD_ID_FREQUENCY 400000
@@ -229,7 +230,7 @@ a10_mmc_attach(device_t dev)
bus_width = 4;
sc->a10_host.f_min = 400000;
- sc->a10_host.f_max = 50000000;
+ sc->a10_host.f_max = 52000000;
sc->a10_host.host_ocr = MMC_OCR_320_330 | MMC_OCR_330_340;
sc->a10_host.mode = mode_sd;
sc->a10_host.caps = MMC_CAP_HSPEED;
@@ -449,11 +450,27 @@ a10_mmc_req_done(struct a10_mmc_softc *s
{
struct mmc_command *cmd;
struct mmc_request *req;
+ uint32_t val, mask;
+ int retry;
cmd = sc->a10_req->cmd;
if (cmd->error != MMC_ERR_NONE) {
- /* Reset the controller. */
- a10_mmc_reset(sc);
+ /* Reset the FIFO and DMA engines. */
+ mask = A10_MMC_CTRL_FIFO_RST | A10_MMC_CTRL_DMA_RST;
+ val = A10_MMC_READ_4(sc, A10_MMC_GCTL);
+ A10_MMC_WRITE_4(sc, A10_MMC_GCTL, val | mask);
+
+ retry = A10_MMC_RESET_RETRY;
+ while (--retry > 0) {
+ val = A10_MMC_READ_4(sc, A10_MMC_GCTL);
+ if ((val & mask) == 0)
+ break;
+ DELAY(10);
+ }
+ if (retry == 0)
+ device_printf(sc->a10_dev,
+ "timeout resetting DMA/FIFO\n");
+ a10_mmc_update_clock(sc, 1);
}
req = sc->a10_req;
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