On 10/27/2022 12:21 PM, Takashi Iwai wrote:
On Thu, 27 Oct 2022 10:23:25 +0200,
Cezary Rojewski wrote:
--- a/sound/hda/hdac_stream.c
+++ b/sound/hda/hdac_stream.c
@@ -821,6 +821,27 @@ void snd_hdac_stream_drsm_enable(struct hdac_bus *bus,
}
EXPORT_SYMBOL_GPL(snd_hdac_stream_drsm_enable);
+/*
+ * snd_hdac_stream_wait_drsm - wait for HW to clear RSM for a stream
+ * @azx_dev: HD-audio core stream to await RSM for
+ *
+ * Returns 0 on success and -ETIMEDOUT upon a timeout.
+ */
+int snd_hdac_stream_wait_drsm(struct hdac_stream *azx_dev)
+{
+ struct hdac_bus *bus = azx_dev->bus;
+ u32 mask, reg;
+ int ret;
+
+ mask = 1 << azx_dev->index;
+
+ ret = readb_poll_timeout(bus->drsmcap + AZX_REG_DRSM_CTL, reg, !(reg & mask), 250, 2000);
Remember that HD-audio bus doesn't always allow readb(). Tegra
requires the aligned access, for example.
The readb_poll_timeout macro was updated to take care of that,
https://lore.kernel.org/all/20221007084856.1638302-1-amadeuszx.slawinski@xxxxxxxxxxxxxxx/
so it should be fine?
