On 03/02/2010 04:18 PM, Sergei Shtylyov wrote:
Hello. Anton Vorontsov wrote:Factor out some ahci_em_messages handling code from ahci_init_one(). We would like to reuse it for non-PCI devices. Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxxxxx> --- drivers/ata/ahci.c | 41 ++++++++++++++++++++++++----------------- 1 files changed, 24 insertions(+), 17 deletions(-) diff --git a/drivers/ata/ahci.c b/drivers/ata/ahci.c index 18443e9..6694b17 100644 --- a/drivers/ata/ahci.c +++ b/drivers/ata/ahci.c @@ -3040,6 +3040,29 @@ static inline void ahci_gtf_filter_workaround(struct ata_host *host) {} #endif +static void ahci_set_em_messages(struct ahci_host_priv *hpriv, + struct ata_port_info *pi) +{ + u8 messages; + void __iomem *mmio = hpriv->mmio; + u32 em_loc = readl(mmio + HOST_EM_LOC); + u32 em_ctl = readl(mmio + HOST_EM_CTL); + + if (!ahci_em_messages || !(hpriv->cap & HOST_CAP_EMS)) + return; + + messages = (em_ctl & EM_CTRL_MSG_TYPE) >> 16; + + /* we only support LED message type right now */ + if ((messages & 0x01) && (ahci_em_messages == 1)) { + /* store em_loc */ + hpriv->em_loc = ((em_loc >> 16) * 4);Could drop unneeded parens, while at it...
While not strictly necessary, parens often help with readability. I think the above code looks fine as-is. If the reader has to waste a few seconds recalling C's operator precedence, that detracts from the easy reading of the code. Not everyone is like me and has worked on a C compiler, you know ;-)
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