From: Alexey Brodkin <Alexey.Brodkin@xxxxxxxxxxxx> Date: Thu, 5 Jun 2014 16:58:00 +0400 > On some platforms existing 100 msecond delay is not enough for DMA block to > recover after reset. This is because MAC DMA waits for all PHY input clocks > to present and depending on the board reset bit deassertion may take much > longer than previously used 100 milliseconds > > I have a board that requires more than 2 seconds for DMA to zero "reset" bit. > If for other boards it's still not long enough this value should be extended > once again. > > In the same change I convert "mdelay" to "msleep" to make CPU available for > other processes during DMA init delay which is especially useful in case of > delay for a few seconds. > > Signed-off-by: Alexey Brodkin <abrodkin@xxxxxxxxxxxx> This will not work, you cannot sleep with spinlocks held, and this code is absolutely called in such a context. For example stmmac_resume() --> stmmac_hw_setup() -> stmmac_init_dma_engine(). stmmac_resume() holds priv->lock over all of these operations, and even has interrupts disabled. -- To unsubscribe from this list: send the line "unsubscribe devicetree" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
