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Subject[v2,3/3] mmc: mediatek: add optional module reset property
Date
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.

Fixes: 966580ad236e ("mmc: mediatek: add support for MT7622 SoC")
Signed-off-by: Wenbin Mei <wenbin.mei@mediatek.com>
Tested-by: Frank Wunderlich <frank-w@public-files.de>
---
drivers/mmc/host/mtk-sd.c | 13 +++++++++++++
1 file changed, 13 insertions(+)

diff --git a/drivers/mmc/host/mtk-sd.c b/drivers/mmc/host/mtk-sd.c
index 39e7fc54c438..2b243c03c9b2 100644
--- a/drivers/mmc/host/mtk-sd.c
+++ b/drivers/mmc/host/mtk-sd.c
@@ -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>
@@ -434,6 +435,7 @@ struct msdc_host {
struct msdc_save_para save_para; /* used when gate HCLK */
struct msdc_tune_para def_tune_para; /* default tune setting */
struct msdc_tune_para saved_tune_para; /* tune result of CMD21/CMD19 */
+ struct reset_control *reset;
};

static const struct mtk_mmc_compatible mt8135_compat = {
@@ -1516,6 +1518,12 @@ static void msdc_init_hw(struct msdc_host *host)
u32 val;
u32 tune_reg = host->dev_comp->pad_tune_reg;

+ if (!IS_ERR(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);

@@ -2273,6 +2281,11 @@ 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 (PTR_ERR(host->reset) == -EPROBE_DEFER)
+ return PTR_ERR(host->reset);
+
host->irq = platform_get_irq(pdev, 0);
if (host->irq < 0) {
ret = -EINVAL;
--
2.18.0
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