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Subject[PATCH 1/7] mmc: meson-gx: remove open coded read with timeout
Date
There is already a function available to poll a register until a
condition is met. Let's use it instead of open coding it.

Signed-off-by: Jerome Brunet <jbrunet@baylibre.com>
---
drivers/mmc/host/meson-gx-mmc.c | 18 ++++--------------
1 file changed, 4 insertions(+), 14 deletions(-)

diff --git a/drivers/mmc/host/meson-gx-mmc.c b/drivers/mmc/host/meson-gx-mmc.c
index 2eba507790e4..2deeacc051b1 100644
--- a/drivers/mmc/host/meson-gx-mmc.c
+++ b/drivers/mmc/host/meson-gx-mmc.c
@@ -23,6 +23,7 @@
#include <linux/init.h>
#include <linux/delay.h>
#include <linux/device.h>
+#include <linux/iopoll.h>
#include <linux/of_device.h>
#include <linux/platform_device.h>
#include <linux/ioport.h>
@@ -1100,7 +1101,6 @@ static irqreturn_t meson_mmc_irq(int irq, void *dev_id)

static int meson_mmc_wait_desc_stop(struct meson_host *host)
{
- int loop;
u32 status;

/*
@@ -1110,20 +1110,10 @@ static int meson_mmc_wait_desc_stop(struct meson_host *host)
* If we don't confirm the descriptor is stopped, it might raise new
* IRQs after we have called mmc_request_done() which is bad.
*/
- for (loop = 50; loop; loop--) {
- status = readl(host->regs + SD_EMMC_STATUS);
- if (status & (STATUS_BUSY | STATUS_DESC_BUSY))
- udelay(100);
- else
- break;
- }

- if (status & (STATUS_BUSY | STATUS_DESC_BUSY)) {
- dev_err(host->dev, "Timed out waiting for host to stop\n");
- return -ETIMEDOUT;
- }
-
- return 0;
+ return readl_poll_timeout(host->regs + SD_EMMC_STATUS, status,
+ !(status & (STATUS_BUSY | STATUS_DESC_BUSY)),
+ 100, 5000);
}

static irqreturn_t meson_mmc_irq_thread(int irq, void *dev_id)
--
2.20.1
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