[SRU][H/raspi][PATCH 2/5] mmc: sdhost: Pass DT pointer to rpi_firmware_get

[Juerg Haefliger]

From: Phil Elwell <phil at raspberrypi.com>

BugLink: https://bugs.launchpad.net/bugs/1950064

Using the rpi_firmware API as intended allows proper reference counting
of the firmware device and means we can remove a downstream patch to
the firmware driver.

Signed-off-by: Phil Elwell <phil at raspberrypi.com>

(cherry picked from commit 491b5c65cbed7d30cc2b3e5a6e724dcff0865809 linux-rpi)
Signed-off-by: Juerg Haefliger <juergh at canonical.com>
---
 drivers/mmc/host/bcm2835-sdhost.c | 16 ++++++++++++++--
 1 file changed, 14 insertions(+), 2 deletions(-)

diff --git a/drivers/mmc/host/bcm2835-sdhost.c b/drivers/mmc/host/bcm2835-sdhost.c
index 7caba5e12f79..2c4124082785 100644
--- a/drivers/mmc/host/bcm2835-sdhost.c
+++ b/drivers/mmc/host/bcm2835-sdhost.c
@@ -147,6 +147,8 @@
 struct bcm2835_host {
 	spinlock_t		lock;
 
+	struct rpi_firmware	*fw;
+
 	void __iomem		*ioaddr;
 	phys_addr_t		bus_addr;
 
@@ -1558,7 +1560,7 @@ void bcm2835_sdhost_set_clock(struct bcm2835_host *host, unsigned int clock)
 	if (host->firmware_sets_cdiv) {
 		u32 msg[3] = { clock, 0, 0 };
 
-		rpi_firmware_property(rpi_firmware_get(NULL),
+		rpi_firmware_property(host->fw,
 				      RPI_FIRMWARE_SET_SDHOST_CLOCK,
 				      &msg, sizeof(msg));
 
@@ -2100,6 +2102,13 @@ static int bcm2835_sdhost_probe(struct platform_device *pdev)
 		goto err;
 	}
 
+	host->fw = rpi_firmware_get(
+		of_parse_phandle(dev->of_node, "firmware", 0));
+	if (!host->fw) {
+		ret = -EPROBE_DEFER;
+		goto err;
+	}
+
 	host->max_clk = clk_get_rate(clk);
 
 	host->irq = platform_get_irq(pdev, 0);
@@ -2124,7 +2133,7 @@ static int bcm2835_sdhost_probe(struct platform_device *pdev)
 	msg[1] = ~0;
 	msg[2] = ~0;
 
-	rpi_firmware_property(rpi_firmware_get(NULL),
+	rpi_firmware_property(host->fw,
 			      RPI_FIRMWARE_SET_SDHOST_CLOCK,
 			      &msg, sizeof(msg));
 
@@ -2142,6 +2151,8 @@ static int bcm2835_sdhost_probe(struct platform_device *pdev)
 
 err:
 	pr_debug("bcm2835_sdhost_probe -> err %d\n", ret);
+	if (host->fw)
+		rpi_firmware_put(host->fw);
 	if (host->dma_chan_rxtx)
 		dma_release_channel(host->dma_chan_rxtx);
 	mmc_free_host(mmc);
@@ -2164,6 +2175,7 @@ static int bcm2835_sdhost_remove(struct platform_device *pdev)
 	del_timer_sync(&host->timer);
 
 	tasklet_kill(&host->finish_tasklet);
+	rpi_firmware_put(host->fw);
 	if (host->dma_chan_rxtx)
 		dma_release_channel(host->dma_chan_rxtx);
 	mmc_free_host(host->mmc);
-- 
2.30.2