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drm/nouveau/disp/dp: maintain receiver caps in response to hpd signal

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Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
This commit is contained in:
Ben Skeggs 2014-05-19 11:54:09 +10:00
parent b8407c9e50
commit bb7ef1ec2e
2 changed files with 70 additions and 10 deletions
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76
drivers/gpu/drm/nouveau/core/engine/disp/outpdp.c
View file

@ -26,21 +26,73 @@
#include "outpdp.h"
#include "conn.h"
#include "dport.h"
static void
nvkm_output_dp_enable(struct nvkm_output_dp *outp, bool present)
{
struct nouveau_i2c_port *port = outp->base.edid;
if (present) {
if (!outp->present) {
nouveau_i2c(port)->acquire_pad(port, 0);
DBG("aux power -> always\n");
outp->present = true;
}
} else {
if (outp->present) {
nouveau_i2c(port)->release_pad(port);
DBG("aux power -> demand\n");
outp->present = false;
}
}
}
static void
nvkm_output_dp_detect(struct nvkm_output_dp *outp)
{
struct nouveau_i2c_port *port = outp->base.edid;
int ret = nouveau_i2c(port)->acquire_pad(port, 0);
if (ret == 0) {
ret = nv_rdaux(outp->base.edid, DPCD_RC00_DPCD_REV,
outp->dpcd, sizeof(outp->dpcd));
nvkm_output_dp_enable(outp, ret == 0);
nouveau_i2c(port)->release_pad(port);
}
}
static void
nvkm_output_dp_service_work(struct work_struct *work)
{
struct nvkm_output_dp *outp = container_of(work, typeof(*outp), work);
struct nouveau_disp *disp = nouveau_disp(outp);
int type = atomic_xchg(&outp->pending, 0);
u32 send = 0;
if (type & (NVKM_I2C_PLUG | NVKM_I2C_UNPLUG)) {
nvkm_output_dp_detect(outp);
if (type & NVKM_I2C_UNPLUG)
send |= NVKM_HPD_UNPLUG;
if (type & NVKM_I2C_PLUG)
send |= NVKM_HPD_PLUG;
nouveau_event_get(outp->base.conn->hpd.event);
}
if (type & NVKM_I2C_IRQ) {
nouveau_event_get(outp->irq);
send |= NVKM_HPD_IRQ;
}
nouveau_event_trigger(disp->hpd, send, outp->base.info.connector);
}
static int
nvkm_output_dp_service(void *data, u32 type, int index)
{
struct nvkm_output_dp *outp = data;
DBG("IRQ: %d\n", type);
return NVKM_EVENT_KEEP;
}
static int
nvkm_output_dp_hotplug(void *data, u32 type, int index)
{
struct nvkm_output_dp *outp = data;
DBG("HPD: %d\n", type);
return NVKM_EVENT_KEEP;
atomic_or(type, &outp->pending);
schedule_work(&outp->work);
return NVKM_EVENT_DROP;
}
int
@ -48,6 +100,7 @@ _nvkm_output_dp_fini(struct nouveau_object *object, bool suspend)
{
struct nvkm_output_dp *outp = (void *)object;
nouveau_event_put(outp->irq);
nvkm_output_dp_enable(outp, false);
return nvkm_output_fini(&outp->base, suspend);
}
@ -55,6 +108,7 @@ int
_nvkm_output_dp_init(struct nouveau_object *object)
{
struct nvkm_output_dp *outp = (void *)object;
nvkm_output_dp_detect(outp);
return nvkm_output_init(&outp->base);
}
@ -113,10 +167,12 @@ nvkm_output_dp_create_(struct nouveau_object *parent,
return ret;
}
INIT_WORK(&outp->work, nvkm_output_dp_service_work);
/* hotplug detect, replaces gpio-based mechanism with aux events */
ret = nouveau_event_new(i2c->ntfy, NVKM_I2C_PLUG | NVKM_I2C_UNPLUG,
outp->base.edid->index,
nvkm_output_dp_hotplug, outp,
nvkm_output_dp_service, outp,
&outp->base.conn->hpd.event);
if (ret) {
ERR("error monitoring aux hpd events: %d\n", ret);

4
drivers/gpu/drm/nouveau/core/engine/disp/outpdp.h
View file

@ -14,6 +14,10 @@ struct nvkm_output_dp {
struct nouveau_eventh *irq;
struct nouveau_eventh *hpd;
struct work_struct work;
atomic_t pending;
bool present;
u8 dpcd[16];
};
#define nvkm_output_dp_create(p,e,c,b,i,d) \