From mboxrd@z Thu Jan 1 00:00:00 1970 From: srinivas.kandagatla@linaro.org (Srinivas Kandagatla) Date: Thu, 31 Mar 2016 16:58:27 +0100 Subject: [RFC PATCH 1/3] libahci: save port map for forced port map In-Reply-To: <20160330185706.GQ7822@mtj.duckdns.org> References: <1459257075-21393-1-git-send-email-srinivas.kandagatla@linaro.org> <1459257075-21393-2-git-send-email-srinivas.kandagatla@linaro.org> <20160330185706.GQ7822@mtj.duckdns.org> Message-ID: <56FD4923.3090209@linaro.org> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On 30/03/16 19:57, Tejun Heo wrote: > Hello, > > On Tue, Mar 29, 2016 at 02:11:13PM +0100, Srinivas Kandagatla wrote: >> In usecases where force_port_map is used saved_port_map is never set, >> resulting in not programming the PORTS_IMPL register as part of intial >> config. This patch fixes this by setting it to port_map even in case >> where force_port_map is used, making it more inline with other parts of >> the code. >> >> Signed-off-by: Srinivas Kandagatla >> --- >> drivers/ata/libahci.c | 1 + >> 1 file changed, 1 insertion(+) >> >> diff --git a/drivers/ata/libahci.c b/drivers/ata/libahci.c >> index 3982054..a5d7c1c 100644 >> --- a/drivers/ata/libahci.c >> +++ b/drivers/ata/libahci.c >> @@ -507,6 +507,7 @@ void ahci_save_initial_config(struct device *dev, struct ahci_host_priv *hpriv) >> dev_info(dev, "forcing port_map 0x%x -> 0x%x\n", >> port_map, hpriv->force_port_map); >> port_map = hpriv->force_port_map; >> + hpriv->saved_port_map = port_map; > > So, the only change it'd cause is making the driver write the forced > value to the PI register. Does that make sense? Yes, that is the intention, I guess, This was done exactly in case where the port number was fabricated too. Without this I could not get the sata working on my board with forced port map option. --srini > > Thanks. >