redonkable
/
alistair23-linux
1
0
Fork 0
Code Releases Activity

mmc: mediatek: add optional module reset property 

commit 855d388df2 upstream.

This patch fixs eMMC-Access on mt7622/Bpi-64.
Before we got these Errors on mounting eMMC ion R64:
[   48.664925] blk_update_request: I/O error, dev mmcblk0, sector 204800 op 0x1:(WRITE)
flags 0x800 phys_seg 1 prio class 0
[   48.676019] Buffer I/O error on dev mmcblk0p1, logical block 0, lost sync page write

This patch adds a optional reset management for msdc.
Sometimes the bootloader does not bring msdc register
to default state, so need reset the msdc controller.

Cc: <stable@vger.kernel.org> # v5.4+
Fixes: 966580ad23 ("mmc: mediatek: add support for MT7622 SoC")
Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
Reviewed-by: Philipp Zabel <p.zabel@pengutronix.de>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
Link: https://lore.kernel.org/r/20200814014346.6496-4-wenbin.mei@mediatek.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
5.4-rM2-2.2.x-imx-squashed
Wenbin Mei 2020-08-14 09:43:46 +08:00 committed by Greg Kroah-Hartman
parent 2816ccd071
commit 5876ee035b
1 changed files with 13 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

13
drivers/mmc/host/mtk-sd.c
View File

@ -22,6 +22,7 @@
#include <linux/slab.h>
#include <linux/spinlock.h>
#include <linux/interrupt.h>
#include <linux/reset.h>
#include <linux/mmc/card.h>
#include <linux/mmc/core.h>
@ -412,6 +413,7 @@ struct msdc_host {
struct pinctrl_state *pins_uhs;
struct delayed_work req_timeout;
int irq; /* host interrupt */
struct reset_control *reset;
struct clk *src_clk; /* msdc source clock */
struct clk *h_clk; /* msdc h_clk */
@ -1474,6 +1476,12 @@ static void msdc_init_hw(struct msdc_host *host)
u32 val;
u32 tune_reg = host->dev_comp->pad_tune_reg;
if (host->reset) {
reset_control_assert(host->reset);
usleep_range(10, 50);
reset_control_deassert(host->reset);
}
/* Configure to MMC/SD mode, clock free running */
sdr_set_bits(host->base + MSDC_CFG, MSDC_CFG_MODE | MSDC_CFG_CKPDN);
@ -2232,6 +2240,11 @@ static int msdc_drv_probe(struct platform_device *pdev)
if (IS_ERR(host->src_clk_cg))
host->src_clk_cg = NULL;
host->reset = devm_reset_control_get_optional_exclusive(&pdev->dev,
"hrst");
if (IS_ERR(host->reset))
return PTR_ERR(host->reset);
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0) {
ret = -EINVAL;