[PATCH v2 6/8] mmc: sunxi: Move the reset deassertion before enabling the clocks
From: Maxime Ripard <hidden>
Date: 2018-03-08 14:52:52
Also in:
linux-mmc
Subsystem:
multimedia card (mmc), secure digital (sd) and sdio subsystem, the rest · Maintainers:
Ulf Hansson, Linus Torvalds
As per Allwinner guidelines, the reset line should be deasserted before turning the clocks on. Implement it in our driver as well. Signed-off-by: Maxime Ripard <redacted> --- drivers/mmc/host/sunxi-mmc.c | 36 ++++++++++++++++++------------------ 1 file changed, 18 insertions(+), 18 deletions(-)
diff --git a/drivers/mmc/host/sunxi-mmc.c b/drivers/mmc/host/sunxi-mmc.c
index 34bc90bc04b2..c6431f6e816f 100644
--- a/drivers/mmc/host/sunxi-mmc.c
+++ b/drivers/mmc/host/sunxi-mmc.c@@ -1188,10 +1188,19 @@ static int sunxi_mmc_enable(struct sunxi_mmc_host *host) { int ret; + if (!IS_ERR(host->reset)) { + ret = reset_control_reset(host->reset); + if (ret) { + dev_err(host->dev, "Couldn't reset the MMC controller (%d)\n", + ret); + return ret; + } + } + ret = clk_prepare_enable(host->clk_ahb); if (ret) { - dev_err(dev, "Couldn't enable the bus clocks (%d)\n", ret); - return ret; + dev_err(host->dev, "Couldn't enable the bus clocks (%d)\n", ret); + goto error_assert_reset; } ret = clk_prepare_enable(host->clk_mmc);
@@ -1212,28 +1221,16 @@ static int sunxi_mmc_enable(struct sunxi_mmc_host *host) goto error_disable_clk_output; } - if (!IS_ERR(host->reset)) { - ret = reset_control_reset(host->reset); - if (ret) { - dev_err(dev, "Couldn't reset the MMC controller (%d)\n", - ret); - goto error_disable_clk_sample; - } - } - /* * Sometimes the controller asserts the irq on boot for some reason, * make sure the controller is in a sane state before enabling irqs. */ ret = sunxi_mmc_reset_host(host); if (ret) - goto error_assert_reset; + goto error_disable_clk_sample; return 0; -error_assert_reset: - if (!IS_ERR(host->reset)) - reset_control_assert(host->reset); error_disable_clk_sample: clk_disable_unprepare(host->clk_sample); error_disable_clk_output:
@@ -1242,6 +1239,9 @@ static int sunxi_mmc_enable(struct sunxi_mmc_host *host) clk_disable_unprepare(host->clk_mmc); error_disable_clk_ahb: clk_disable_unprepare(host->clk_ahb); +error_assert_reset: + if (!IS_ERR(host->reset)) + reset_control_assert(host->reset); return ret; }
@@ -1249,13 +1249,13 @@ static void sunxi_mmc_disable(struct sunxi_mmc_host *host) { sunxi_mmc_reset_host(host); - if (!IS_ERR(host->reset)) - reset_control_assert(host->reset); - clk_disable_unprepare(host->clk_sample); clk_disable_unprepare(host->clk_output); clk_disable_unprepare(host->clk_mmc); clk_disable_unprepare(host->clk_ahb); + + if (!IS_ERR(host->reset)) + reset_control_assert(host->reset); } static int sunxi_mmc_resource_request(struct sunxi_mmc_host *host,
--
git-series 0.9.1