[PATCH v3 2/3] drm: zte: add .atomic_disable hook to disable graphic layer
Sean Paul
seanpaul at chromium.org
Wed Jan 4 23:26:45 PST 2017
On Wed, Dec 28, 2016 at 9:37 PM, Shawn Guo <shawnguo at kernel.org> wrote:
> From: Shawn Guo <shawn.guo at linaro.org>
>
> There are a few hardware bits for each graphic layer to control main/aux
> channel and clock selection, as well as the layer enabling. These bits
> sit outside the layer block itself, but in VOU control glue block. We
> currently set these bits up at CRTC initialization for once, and do not
> support disabling the layer.
>
> This patch creates a pair of functions zx_vou_layer_enable[disable] to
> be invoked from plane hooks .atomic_update and .atomic_disable to set up
> and tear down the layer. This is generic for both graphic and video
> layers, so it will make the overlay plane support to be added later much
> easier.
>
This feels ever so slightly awkward since the plane is calling back to
the crtc in enable/disable, but i suppose this is a byproduct of
defining the atomic plane hooks in zx_plane. I think we just need to
be careful not to introduce more of these cross-block/file
dependencies, as that might signify that zx_plane should be merged
into zx_vou. At the moment, I feel like this is fine, so,
Reviewed-by: Sean Paul <seanpaul at chromium.org>
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> ---
> drivers/gpu/drm/zte/zx_plane.c | 15 +++++++++
> drivers/gpu/drm/zte/zx_plane.h | 1 +
> drivers/gpu/drm/zte/zx_vou.c | 70 ++++++++++++++++++++++++++++++------------
> drivers/gpu/drm/zte/zx_vou.h | 3 ++
> 4 files changed, 69 insertions(+), 20 deletions(-)
>
> diff --git a/drivers/gpu/drm/zte/zx_plane.c b/drivers/gpu/drm/zte/zx_plane.c
> index 78d29b1db91c..5445eebf830f 100644
> --- a/drivers/gpu/drm/zte/zx_plane.c
> +++ b/drivers/gpu/drm/zte/zx_plane.c
> @@ -197,12 +197,27 @@ static void zx_gl_plane_atomic_update(struct drm_plane *plane,
> /* Enable HBSC block */
> zx_writel_mask(hbsc + HBSC_CTRL0, HBSC_CTRL_EN, HBSC_CTRL_EN);
>
> + zx_vou_layer_enable(plane);
> +
> zx_gl_set_update(zplane);
> }
>
> +static void zx_plane_atomic_disable(struct drm_plane *plane,
> + struct drm_plane_state *old_state)
> +{
> + struct zx_plane *zplane = to_zx_plane(plane);
> + void __iomem *hbsc = zplane->hbsc;
> +
> + zx_vou_layer_disable(plane);
> +
> + /* Disable HBSC block */
> + zx_writel_mask(hbsc + HBSC_CTRL0, HBSC_CTRL_EN, 0);
> +}
> +
> static const struct drm_plane_helper_funcs zx_gl_plane_helper_funcs = {
> .atomic_check = zx_gl_plane_atomic_check,
> .atomic_update = zx_gl_plane_atomic_update,
> + .atomic_disable = zx_plane_atomic_disable,
> };
>
> static void zx_plane_destroy(struct drm_plane *plane)
> diff --git a/drivers/gpu/drm/zte/zx_plane.h b/drivers/gpu/drm/zte/zx_plane.h
> index 264a92e0b532..933611ddffd0 100644
> --- a/drivers/gpu/drm/zte/zx_plane.h
> +++ b/drivers/gpu/drm/zte/zx_plane.h
> @@ -18,6 +18,7 @@ struct zx_plane {
> void __iomem *csc;
> void __iomem *hbsc;
> void __iomem *rsz;
> + const struct vou_layer_bits *bits;
> };
>
> #define to_zx_plane(plane) container_of(plane, struct zx_plane, plane)
> diff --git a/drivers/gpu/drm/zte/zx_vou.c b/drivers/gpu/drm/zte/zx_vou.c
> index d5c801f6f97b..3fb4fc04e693 100644
> --- a/drivers/gpu/drm/zte/zx_vou.c
> +++ b/drivers/gpu/drm/zte/zx_vou.c
> @@ -65,7 +65,6 @@ struct zx_crtc_bits {
> u32 polarity_shift;
> u32 int_frame_mask;
> u32 tc_enable;
> - u32 gl_enable;
> };
>
> static const struct zx_crtc_bits main_crtc_bits = {
> @@ -73,7 +72,6 @@ struct zx_crtc_bits {
> .polarity_shift = MAIN_POL_SHIFT,
> .int_frame_mask = TIMING_INT_MAIN_FRAME,
> .tc_enable = MAIN_TC_EN,
> - .gl_enable = OSD_CTRL0_GL0_EN,
> };
>
> static const struct zx_crtc_bits aux_crtc_bits = {
> @@ -81,7 +79,6 @@ struct zx_crtc_bits {
> .polarity_shift = AUX_POL_SHIFT,
> .int_frame_mask = TIMING_INT_AUX_FRAME,
> .tc_enable = AUX_TC_EN,
> - .gl_enable = OSD_CTRL0_GL1_EN,
> };
>
> struct zx_crtc {
> @@ -97,6 +94,24 @@ struct zx_crtc {
>
> #define to_zx_crtc(x) container_of(x, struct zx_crtc, crtc)
>
> +struct vou_layer_bits {
> + u32 enable;
> + u32 chnsel;
> + u32 clksel;
> +};
> +
> +static const struct vou_layer_bits zx_gl_bits[GL_NUM] = {
> + {
> + .enable = OSD_CTRL0_GL0_EN,
> + .chnsel = OSD_CTRL0_GL0_SEL,
> + .clksel = VOU_CLK_GL0_SEL,
> + }, {
> + .enable = OSD_CTRL0_GL1_EN,
> + .chnsel = OSD_CTRL0_GL1_SEL,
> + .clksel = VOU_CLK_GL1_SEL,
> + },
> +};
> +
> struct zx_vou_hw {
> struct device *dev;
> void __iomem *osd;
> @@ -220,10 +235,6 @@ static void zx_crtc_enable(struct drm_crtc *crtc)
> /* Enable channel */
> zx_writel_mask(zcrtc->chnreg + CHN_CTRL0, CHN_ENABLE, CHN_ENABLE);
>
> - /* Enable Graphic Layer */
> - zx_writel_mask(vou->osd + OSD_CTRL0, bits->gl_enable,
> - bits->gl_enable);
> -
> drm_crtc_vblank_on(crtc);
>
> ret = clk_set_rate(zcrtc->pixclk, mode->clock * 1000);
> @@ -247,9 +258,6 @@ static void zx_crtc_disable(struct drm_crtc *crtc)
>
> drm_crtc_vblank_off(crtc);
>
> - /* Disable Graphic Layer */
> - zx_writel_mask(vou->osd + OSD_CTRL0, bits->gl_enable, 0);
> -
> /* Disable channel */
> zx_writel_mask(zcrtc->chnreg + CHN_CTRL0, CHN_ENABLE, 0);
>
> @@ -316,6 +324,7 @@ static int zx_crtc_init(struct drm_device *drm, struct zx_vou_hw *vou,
> zplane->csc = vou->osd + MAIN_CSC_OFFSET;
> zplane->hbsc = vou->osd + MAIN_HBSC_OFFSET;
> zplane->rsz = vou->otfppu + MAIN_RSZ_OFFSET;
> + zplane->bits = &zx_gl_bits[0];
> zcrtc->chnreg = vou->osd + OSD_MAIN_CHN;
> zcrtc->regs = &main_crtc_regs;
> zcrtc->bits = &main_crtc_bits;
> @@ -324,6 +333,7 @@ static int zx_crtc_init(struct drm_device *drm, struct zx_vou_hw *vou,
> zplane->csc = vou->osd + AUX_CSC_OFFSET;
> zplane->hbsc = vou->osd + AUX_HBSC_OFFSET;
> zplane->rsz = vou->otfppu + AUX_RSZ_OFFSET;
> + zplane->bits = &zx_gl_bits[1];
> zcrtc->chnreg = vou->osd + OSD_AUX_CHN;
> zcrtc->regs = &aux_crtc_regs;
> zcrtc->bits = &aux_crtc_bits;
> @@ -411,6 +421,36 @@ void zx_vou_disable_vblank(struct drm_device *drm, unsigned int pipe)
> zcrtc->bits->int_frame_mask, 0);
> }
>
> +void zx_vou_layer_enable(struct drm_plane *plane)
> +{
> + struct zx_crtc *zcrtc = to_zx_crtc(plane->state->crtc);
> + struct zx_vou_hw *vou = zcrtc->vou;
> + struct zx_plane *zplane = to_zx_plane(plane);
> + const struct vou_layer_bits *bits = zplane->bits;
> +
> + if (zcrtc->chn_type == VOU_CHN_MAIN) {
> + zx_writel_mask(vou->osd + OSD_CTRL0, bits->chnsel, 0);
> + zx_writel_mask(vou->vouctl + VOU_CLK_SEL, bits->clksel, 0);
> + } else {
> + zx_writel_mask(vou->osd + OSD_CTRL0, bits->chnsel,
> + bits->chnsel);
> + zx_writel_mask(vou->vouctl + VOU_CLK_SEL, bits->clksel,
> + bits->clksel);
> + }
> +
> + zx_writel_mask(vou->osd + OSD_CTRL0, bits->enable, bits->enable);
> +}
> +
> +void zx_vou_layer_disable(struct drm_plane *plane)
> +{
> + struct zx_crtc *zcrtc = to_zx_crtc(plane->crtc);
> + struct zx_vou_hw *vou = zcrtc->vou;
> + struct zx_plane *zplane = to_zx_plane(plane);
> + const struct vou_layer_bits *bits = zplane->bits;
> +
> + zx_writel_mask(vou->osd + OSD_CTRL0, bits->enable, 0);
> +}
> +
> static irqreturn_t vou_irq_handler(int irq, void *dev_id)
> {
> struct zx_vou_hw *vou = dev_id;
> @@ -469,19 +509,9 @@ static void vou_dtrc_init(struct zx_vou_hw *vou)
>
> static void vou_hw_init(struct zx_vou_hw *vou)
> {
> - /* Set GL0 to main channel and GL1 to aux channel */
> - zx_writel_mask(vou->osd + OSD_CTRL0, OSD_CTRL0_GL0_SEL, 0);
> - zx_writel_mask(vou->osd + OSD_CTRL0, OSD_CTRL0_GL1_SEL,
> - OSD_CTRL0_GL1_SEL);
> -
> /* Release reset for all VOU modules */
> zx_writel(vou->vouctl + VOU_SOFT_RST, ~0);
>
> - /* Select main clock for GL0 and aux clock for GL1 module */
> - zx_writel_mask(vou->vouctl + VOU_CLK_SEL, VOU_CLK_GL0_SEL, 0);
> - zx_writel_mask(vou->vouctl + VOU_CLK_SEL, VOU_CLK_GL1_SEL,
> - VOU_CLK_GL1_SEL);
> -
> /* Enable clock auto-gating for all VOU modules */
> zx_writel(vou->vouctl + VOU_CLK_REQEN, ~0);
>
> diff --git a/drivers/gpu/drm/zte/zx_vou.h b/drivers/gpu/drm/zte/zx_vou.h
> index 349e06cd86f4..4b4339be641b 100644
> --- a/drivers/gpu/drm/zte/zx_vou.h
> +++ b/drivers/gpu/drm/zte/zx_vou.h
> @@ -43,4 +43,7 @@ struct vou_inf {
> int zx_vou_enable_vblank(struct drm_device *drm, unsigned int pipe);
> void zx_vou_disable_vblank(struct drm_device *drm, unsigned int pipe);
>
> +void zx_vou_layer_enable(struct drm_plane *plane);
> +void zx_vou_layer_disable(struct drm_plane *plane);
> +
> #endif /* __ZX_VOU_H__ */
> --
> 1.9.1
>
--
Sean Paul, Software Engineer, Google / Chromium OS
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