bus: omap_l3_noc: fix masterid detection

As per Documentation (OMAP4+), then masterid is infact encoded as
follows:
"L3_TARG_STDERRLOG_MSTADDR[7:0] STDERRLOG_MSTADDR stores the NTTP
master address. The master address is the concatenation of Prefix &
Initiator ConnID. It is defined on 8 bits. The 6 MSBs are used to
distinguish the different initiators."

So, when we matchup currently with the master ID list, we never get a
proper match other than when MPU is the master (thanks to 0).

Now, on other platforms such as AM437x, this tends to be bits[5:0].

Fix this by using the relevant 6MSBits to identify the master ID for
standard and custom errors.

Reported-by: Darren Etheridge <detheridge@ti.com>
Signed-off-by: Nishanth Menon <nm@ti.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@ti.com>
Acked-by: Peter Ujfalusi <peter.ujfalusi@ti.com>
Tested-by: Darren Etheridge <detheridge@ti.com>
Tested-by: Sekhar Nori <nsekhar@ti.com>

2 files changed, 9 insertions, 1 deletions

diff --git a/drivers/bus/omap_l3_noc.c b/drivers/bus/omap_l3_noc.c
index 9524452ee12c..8a1926daacd7 100644
--- a/drivers/bus/omap_l3_noc.c
+++ b/drivers/bus/omap_l3_noc.c
@@ -127,7 +127,11 @@ static irqreturn_t l3_interrupt_handler(int irq, void *_l3)
                                           L3_TARG_STDERRLOG_MSTADDR;
 
                         std_err_main = readl_relaxed(l3_targ_stderr);
-                        masterid = readl_relaxed(l3_targ_mstaddr);
+
+                        /* STDERRLOG_MSTADDR Stores the NTTP master address. */
+                        masterid = (readl_relaxed(l3_targ_mstaddr) &
+                                    l3->mst_addr_mask) >>
+                                        __ffs(l3->mst_addr_mask);
 
                         switch (std_err_main & CUSTOM_ERROR) {
                         case STANDARD_ERROR:
diff --git a/drivers/bus/omap_l3_noc.h b/drivers/bus/omap_l3_noc.h
index 64869fe656e5..ba8692444665 100644
--- a/drivers/bus/omap_l3_noc.h
+++ b/drivers/bus/omap_l3_noc.h
@@ -84,6 +84,7 @@ struct l3_flagmux_data {
  * @l3_masters: array pointing to master data containing name and register
  *              offset for the master.
  * @num_master: number of masters
+ * @mst_addr_mask: Mask representing MSTADDR information of NTTP packet
  * @debug_irq:  irq number of the debug interrupt (populated runtime)
  * @app_irq:    irq number of the application interrupt (populated runtime)
  */
@@ -96,6 +97,7 @@ struct omap_l3 {
 
         struct l3_masters_data *l3_masters;
         int num_masters;
+        u32 mst_addr_mask;
 
         int debug_irq;
         int app_irq;
@@ -200,6 +202,8 @@ static const struct omap_l3 omap_l3_data = {
         .num_modules = ARRAY_SIZE(omap_l3_flagmux),
         .l3_masters = omap_l3_masters,
         .num_masters = ARRAY_SIZE(omap_l3_masters),
+        /* The 6 MSBs of register field used to distinguish initiator */
+        .mst_addr_mask = 0xFC,
 };
 
 #endif  /* __OMAP_L3_NOC_H */