[RFC v3 3/5] drm/mediatek: add shadow register support
YT Shen
yt.shen at mediatek.com
Mon Jun 20 01:51:12 PDT 2016
Hi CK,
On Mon, 2016-06-13 at 14:43 +0800, CK Hu wrote:
> Hi, YT:
>
> One comment inline.
>
> On Thu, 2016-06-09 at 00:03 +0800, YT Shen wrote:
> > We need to acquire mutex before using the resources,
> > and need to release it after finished.
> > So we don't need to write registers in the blanking period.
> >
> > Signed-off-by: YT Shen <yt.shen at mediatek.com>
> > ---
> > drivers/gpu/drm/mediatek/mtk_drm_crtc.c | 75 +++++++++++++++++++------------
> > drivers/gpu/drm/mediatek/mtk_drm_ddp.c | 22 +++++++++
> > drivers/gpu/drm/mediatek/mtk_drm_ddp.h | 2 +
> > drivers/gpu/drm/mediatek/mtk_drm_drv.c | 1 +
> > drivers/gpu/drm/mediatek/mtk_drm_drv.h | 1 +
> > 5 files changed, 72 insertions(+), 29 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > index 24aa3ba..80d9641 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_crtc.c
> > @@ -315,6 +315,42 @@ static void mtk_crtc_ddp_hw_fini(struct mtk_drm_crtc *mtk_crtc)
> > pm_runtime_put(drm->dev);
> > }
> >
> > +static void mtk_crtc_ddp_config(struct drm_crtc *crtc)
> > +{
> > + struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> > + struct mtk_crtc_state *state = to_mtk_crtc_state(mtk_crtc->base.state);
> > + struct mtk_ddp_comp *ovl = mtk_crtc->ddp_comp[0];
> > + unsigned int i;
> > +
> > + /*
> > + * TODO: instead of updating the registers here, we should prepare
> > + * working registers in atomic_commit and let the hardware command
> > + * queue update module registers on vblank.
> > + */
> > + if (state->pending_config) {
> > + mtk_ddp_comp_config(ovl, state->pending_width,
> > + state->pending_height,
> > + state->pending_vrefresh);
> > +
> > + state->pending_config = false;
> > + }
> > +
> > + if (mtk_crtc->pending_planes) {
> > + for (i = 0; i < OVL_LAYER_NR; i++) {
> > + struct drm_plane *plane = &mtk_crtc->planes[i].base;
> > + struct mtk_plane_state *plane_state;
> > +
> > + plane_state = to_mtk_plane_state(plane->state);
> > +
> > + if (plane_state->pending.config) {
> > + mtk_ddp_comp_layer_config(ovl, i, plane_state);
> > + plane_state->pending.config = false;
> > + }
> > + }
> > + mtk_crtc->pending_planes = false;
> > + }
> > +}
> > +
> > static void mtk_drm_crtc_enable(struct drm_crtc *crtc)
> > {
> > struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> > @@ -391,6 +427,7 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> > struct drm_crtc_state *old_crtc_state)
> > {
> > struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> > + struct mtk_drm_private *priv = crtc->dev->dev_private;
> > unsigned int pending_planes = 0;
> > int i;
> >
> > @@ -409,6 +446,12 @@ static void mtk_drm_crtc_atomic_flush(struct drm_crtc *crtc,
> > }
> > if (pending_planes)
> > mtk_crtc->pending_planes = true;
> > +
> > + if (priv->data->shadow_register) {
> > + mtk_disp_mutex_acquire(mtk_crtc->mutex);
> > + mtk_crtc_ddp_config(crtc);
> > + mtk_disp_mutex_release(mtk_crtc->mutex);
> > + }
> > }
> >
> > static const struct drm_crtc_funcs mtk_crtc_funcs = {
> > @@ -453,36 +496,10 @@ err_cleanup_crtc:
> > void mtk_crtc_ddp_irq(struct drm_crtc *crtc, struct mtk_ddp_comp *ovl)
> > {
> > struct mtk_drm_crtc *mtk_crtc = to_mtk_crtc(crtc);
> > - struct mtk_crtc_state *state = to_mtk_crtc_state(mtk_crtc->base.state);
> > - unsigned int i;
> > + struct mtk_drm_private *priv = crtc->dev->dev_private;
> >
> > - /*
> > - * TODO: instead of updating the registers here, we should prepare
> > - * working registers in atomic_commit and let the hardware command
> > - * queue update module registers on vblank.
> > - */
> > - if (state->pending_config) {
> > - mtk_ddp_comp_config(ovl, state->pending_width,
> > - state->pending_height,
> > - state->pending_vrefresh);
> > -
> > - state->pending_config = false;
> > - }
> > -
> > - if (mtk_crtc->pending_planes) {
> > - for (i = 0; i < OVL_LAYER_NR; i++) {
> > - struct drm_plane *plane = &mtk_crtc->planes[i].base;
> > - struct mtk_plane_state *plane_state;
> > -
> > - plane_state = to_mtk_plane_state(plane->state);
> > -
> > - if (plane_state->pending.config) {
> > - mtk_ddp_comp_layer_config(ovl, i, plane_state);
> > - plane_state->pending.config = false;
> > - }
> > - }
> > - mtk_crtc->pending_planes = false;
> > - }
> > + if (!priv->data->shadow_register)
> > + mtk_crtc_ddp_config(crtc);
> >
> > mtk_drm_finish_page_flip(mtk_crtc);
> > }
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > index 8030769..fa53806 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.c
> > @@ -12,6 +12,7 @@
> > */
> >
> > #include <linux/clk.h>
> > +#include <linux/iopoll.h>
> > #include <linux/module.h>
> > #include <linux/of_device.h>
> > #include <linux/platform_device.h>
> > @@ -32,6 +33,7 @@
> > #define DISP_REG_CONFIG_MMSYS_CG_CON0 0x100
> >
> > #define DISP_REG_MUTEX_EN(n) (0x20 + 0x20 * (n))
> > +#define DISP_REG_MUTEX(n) (0x24 + 0x20 * (n))
> > #define DISP_REG_MUTEX_RST(n) (0x28 + 0x20 * (n))
> > #define DISP_REG_MUTEX_MOD(n) (0x2c + 0x20 * (n))
> > #define DISP_REG_MUTEX_SOF(n) (0x30 + 0x20 * (n))
> > @@ -300,6 +302,26 @@ void mtk_disp_mutex_disable(struct mtk_disp_mutex *mutex)
> > writel(0, ddp->regs + DISP_REG_MUTEX_EN(mutex->id));
> > }
> >
> > +void mtk_disp_mutex_acquire(struct mtk_disp_mutex *mutex)
> > +{
> > + struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
> > + mutex[mutex->id]);
> > + u32 tmp;
> > +
> > + writel(1, ddp->regs + DISP_REG_MUTEX_EN(mutex->id));
> > + writel(1, ddp->regs + DISP_REG_MUTEX(mutex->id));
> > + readl_poll_timeout_atomic(ddp->regs + DISP_REG_MUTEX(mutex->id), tmp,
> > + tmp & 0x2, 1, 10000);
> > +}
> > +
> > +void mtk_disp_mutex_release(struct mtk_disp_mutex *mutex)
> > +{
> > + struct mtk_ddp *ddp = container_of(mutex, struct mtk_ddp,
> > + mutex[mutex->id]);
> > +
> > + writel(0, ddp->regs + DISP_REG_MUTEX(mutex->id));
> > +}
> > +
> > static int mtk_ddp_probe(struct platform_device *pdev)
> > {
> > struct device *dev = &pdev->dev;
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> > index 92c1175..f9a7991 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_ddp.h
> > @@ -37,5 +37,7 @@ void mtk_disp_mutex_remove_comp(struct mtk_disp_mutex *mutex,
> > enum mtk_ddp_comp_id id);
> > void mtk_disp_mutex_unprepare(struct mtk_disp_mutex *mutex);
> > void mtk_disp_mutex_put(struct mtk_disp_mutex *mutex);
> > +void mtk_disp_mutex_acquire(struct mtk_disp_mutex *mutex);
> > +void mtk_disp_mutex_release(struct mtk_disp_mutex *mutex);
> >
> > #endif /* MTK_DRM_DDP_H */
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.c b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > index 80b4f54..e9eb535 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.c
> > @@ -133,6 +133,7 @@ static const struct mtk_mmsys_driver_data mt8173_mmsys_driver_data = {
> > .main_len = ARRAY_SIZE(mt8173_mtk_ddp_main),
> > .ext_path = mt8173_mtk_ddp_ext,
> > .ext_len = ARRAY_SIZE(mt8173_mtk_ddp_ext),
> > + .shadow_register = false,
>
> global data is initialized as zero.
OK, I will update it in the next version.
>
> > };
> >
> > static int mtk_drm_kms_init(struct drm_device *drm)
> > diff --git a/drivers/gpu/drm/mediatek/mtk_drm_drv.h b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > index fa0b106..94f8b66 100644
> > --- a/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > +++ b/drivers/gpu/drm/mediatek/mtk_drm_drv.h
> > @@ -33,6 +33,7 @@ struct mtk_mmsys_driver_data {
> > unsigned int main_len;
> > const enum mtk_ddp_comp_id *ext_path;
> > unsigned int ext_len;
> > + bool shadow_register;
> > };
> >
> > struct mtk_drm_private {
>
>
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