[PATCH net-next 13/13] net: ipa: pass a value to gsi_irq_type_update()

[Alex Elder]

Now that all of the GSI interrupts are handled uniformly,
change gsi_irq_type_update() so it takes a value.  Have the
function assign that value to the cached mask of enabled GSI
IRQ types before writing it to hardware.

Note that gsi_irq_teardown() will only be called after
gsi_irq_disable(), so it's not necessary for the former
to disable all IRQ types.  Get rid of that.

Signed-off-by: Alex Elder <el...@linaro.org>
---
 drivers/net/ipa/gsi.c | 31 +++++++++++++------------------
 1 file changed, 13 insertions(+), 18 deletions(-)

diff --git a/drivers/net/ipa/gsi.c b/drivers/net/ipa/gsi.c
index aa3983649bc30..961a11d4fb270 100644
--- a/drivers/net/ipa/gsi.c
+++ b/drivers/net/ipa/gsi.c
@@ -231,30 +231,29 @@ static u32 gsi_channel_id(struct gsi_channel *channel)
 }
 
 /* Update the GSI IRQ type register with the cached value */
-static void gsi_irq_type_update(struct gsi *gsi)
+static void gsi_irq_type_update(struct gsi *gsi, u32 val)
 {
-       iowrite32(gsi->type_enabled_bitmap,
-                 gsi->virt + GSI_CNTXT_TYPE_IRQ_MSK_OFFSET);
+       gsi->type_enabled_bitmap = val;
+       iowrite32(val, gsi->virt + GSI_CNTXT_TYPE_IRQ_MSK_OFFSET);
 }
 
 static void gsi_irq_type_enable(struct gsi *gsi, enum gsi_irq_type_id type_id)
 {
-       gsi->type_enabled_bitmap |= BIT(type_id);
-       gsi_irq_type_update(gsi);
+       gsi_irq_type_update(gsi, gsi->type_enabled_bitmap | BIT(type_id));
 }
 
 static void gsi_irq_type_disable(struct gsi *gsi, enum gsi_irq_type_id type_id)
 {
-       gsi->type_enabled_bitmap &= ~BIT(type_id);
-       gsi_irq_type_update(gsi);
+       gsi_irq_type_update(gsi, gsi->type_enabled_bitmap & ~BIT(type_id));
 }
 
 /* Turn off all GSI interrupts initially */
 static void gsi_irq_setup(struct gsi *gsi)
 {
-       gsi->type_enabled_bitmap = 0;
-       gsi_irq_type_update(gsi);
+       /* Disable all interrupt types */
+       gsi_irq_type_update(gsi, 0);
 
+       /* Clear all type-specific interrupt masks */
        iowrite32(0, gsi->virt + GSI_CNTXT_SRC_CH_IRQ_MSK_OFFSET);
        iowrite32(0, gsi->virt + GSI_CNTXT_SRC_EV_CH_IRQ_MSK_OFFSET);
        iowrite32(0, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
@@ -267,8 +266,7 @@ static void gsi_irq_setup(struct gsi *gsi)
 /* Turn off all GSI interrupts when we're all done */
 static void gsi_irq_teardown(struct gsi *gsi)
 {
-       gsi->type_enabled_bitmap = 0;
-       gsi_irq_type_update(gsi);
+       /* Nothing to do */
 }
 
 static void gsi_irq_ieob_enable(struct gsi *gsi, u32 evt_ring_id)
@@ -308,7 +306,7 @@ static void gsi_irq_enable(struct gsi *gsi)
         * that so we can at least report the error should it occur.
         */
        iowrite32(ERROR_INT_FMASK, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
-       gsi->type_enabled_bitmap |= BIT(GSI_GLOB_EE);
+       gsi_irq_type_update(gsi, gsi->type_enabled_bitmap | BIT(GSI_GLOB_EE));
 
        /* General GSI interrupts are reported to all EEs; if they occur
         * they are unrecoverable (without reset).  A breakpoint interrupt
@@ -319,18 +317,15 @@ static void gsi_irq_enable(struct gsi *gsi)
        val |= CMD_FIFO_OVRFLOW_FMASK;
        val |= MCS_STACK_OVRFLOW_FMASK;
        iowrite32(val, gsi->virt + GSI_CNTXT_GSI_IRQ_EN_OFFSET);
-       gsi->type_enabled_bitmap |= BIT(GSI_GENERAL);
-
-       /* Finally update the interrupt types we want enabled */
-       gsi_irq_type_update(gsi);
+       gsi_irq_type_update(gsi, gsi->type_enabled_bitmap | BIT(GSI_GENERAL));
 }
 
 /* Disable all GSI interrupt types */
 static void gsi_irq_disable(struct gsi *gsi)
 {
-       gsi->type_enabled_bitmap = 0;
-       gsi_irq_type_update(gsi);
+       gsi_irq_type_update(gsi, 0);
 
+       /* Clear the type-specific interrupt masks set by gsi_irq_enable() */
        iowrite32(0, gsi->virt + GSI_CNTXT_GSI_IRQ_EN_OFFSET);
        iowrite32(0, gsi->virt + GSI_CNTXT_GLOB_IRQ_EN_OFFSET);
 }
-- 
2.20.1