[PATCH 1/5] drm: zte: add interlace mode support
Shawn Guo
shawnguo at kernel.org
Thu Jan 26 03:14:31 UTC 2017
Hi Sean,
Thanks for reviewing the patches.
On Mon, Jan 23, 2017 at 10:19:01AM -0500, Sean Paul wrote:
> On Fri, Jan 20, 2017 at 12:24:56AM +0800, Shawn Guo wrote:
> > From: Shawn Guo <shawn.guo at linaro.org>
> >
> > It adds interlace mode support in VOU TIMING_CTRL and channel control
> > block, so that VOU driver gets ready to support output device in
> > interlace mode like TV Encoder.
> >
> > Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> > ---
> > drivers/gpu/drm/zte/zx_vou.c | 53 +++++++++++++++++++++++++++++++++++++--
> > drivers/gpu/drm/zte/zx_vou_regs.h | 15 +++++++++++
> > 2 files changed, 66 insertions(+), 2 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/zte/zx_vou.c b/drivers/gpu/drm/zte/zx_vou.c
> > index 3056b41df518..8c4f0e2885f3 100644
> > --- a/drivers/gpu/drm/zte/zx_vou.c
> > +++ b/drivers/gpu/drm/zte/zx_vou.c
>
> <snip>
>
> > @@ -196,19 +211,26 @@ static inline void vou_chn_set_update(struct zx_crtc *zcrtc)
> > static void zx_crtc_enable(struct drm_crtc *crtc)
> > {
> > struct drm_display_mode *mode = &crtc->state->adjusted_mode;
> > + bool interlaced = mode->flags & DRM_MODE_FLAG_INTERLACE;
> > struct zx_crtc *zcrtc = to_zx_crtc(crtc);
> > struct zx_vou_hw *vou = zcrtc->vou;
> > const struct zx_crtc_regs *regs = zcrtc->regs;
> > const struct zx_crtc_bits *bits = zcrtc->bits;
> > struct videomode vm;
> > + u32 vactive;
> > u32 pol = 0;
> > u32 val;
> > + u32 mask;
> > int ret;
> >
> > drm_display_mode_to_videomode(mode, &vm);
> >
> > /* Set up timing parameters */
> > - val = V_ACTIVE(vm.vactive - 1);
> > + vactive = vm.vactive;
> > + if (interlaced)
> > + vactive /= 2;
> > +
> > + val = V_ACTIVE(vactive - 1);
>
> Instead of introducing a new var, I think you can get away with:
>
> if (interlaced)
> val = V_ACTIVE(vm.vactive / 2);
> else
> val = V_ACTIVE(vm.vactive - 1);
The variable is used by SEC_V_ACTIVE register setup below as well. But
yeah, I admit this additional variable makes the code even harder for
readers. I will kill it by having interlaced case check where
necessary.
>
>
> > val |= H_ACTIVE(vm.hactive - 1);
> > zx_writel(vou->timing + regs->fir_active, val);
> >
> > @@ -222,6 +244,22 @@ static void zx_crtc_enable(struct drm_crtc *crtc)
> > val |= FRONT_PORCH(vm.vfront_porch - 1);
> > zx_writel(vou->timing + regs->fir_vtiming, val);
> >
> > + if (interlaced) {
> > + u32 shift = bits->sec_vactive_shift;
> > + u32 mask = bits->sec_vactive_mask;
>
> mask is already defined at the function scope
Right. I will rename the one in function scope to avoid the confusion.
>
> > +
> > + val = zx_readl(vou->timing + SEC_V_ACTIVE);
> > + val &= ~mask;
> > + val |= ((vactive - 1) << shift) & mask;
> > + zx_writel(vou->timing + SEC_V_ACTIVE, val);
> > +
> > + val = SYNC_WIDE(vm.vsync_len - 1);
> > + /* sec_vbp = fir_vbp + 1 */
>
> Looks like leftover kruft here.
It's actually a comment which seems to be only understandable by
myself :) I will write up some proper text for it.
>
> > + val |= BACK_PORCH(vm.vback_porch);
> > + val |= FRONT_PORCH(vm.vfront_porch - 1);
> > + zx_writel(vou->timing + regs->sec_vtiming, val);
> > + }
> > +
> > /* Set up polarities */
> > if (vm.flags & DISPLAY_FLAGS_VSYNC_LOW)
> > pol |= 1 << POL_VSYNC_SHIFT;
> > @@ -232,9 +270,16 @@ static void zx_crtc_enable(struct drm_crtc *crtc)
> > pol << bits->polarity_shift);
> >
> > /* Setup SHIFT register by following what ZTE BSP does */
> > - zx_writel(vou->timing + regs->timing_shift, H_SHIFT_VAL);
> > + val = H_SHIFT_VAL;
> > + if (interlaced)
> > + val |= V_SHIFT_VAL << 16;
> > + zx_writel(vou->timing + regs->timing_shift, val);
> > zx_writel(vou->timing + regs->timing_pi_shift, H_PI_SHIFT_VAL);
> >
> > + /* Progressive or interlace scan select */
> > + mask = bits->interlace_select | bits->pi_enable;
> > + zx_writel_mask(vou->timing + SCAN_CTRL, mask, interlaced ? mask : 0);
> > +
> > /* Enable TIMING_CTRL */
> > zx_writel_mask(vou->timing + TIMING_TC_ENABLE, bits->tc_enable,
> > bits->tc_enable);
> > @@ -245,6 +290,10 @@ static void zx_crtc_enable(struct drm_crtc *crtc)
> > zx_writel_mask(zcrtc->chnreg + CHN_CTRL1, CHN_SCREEN_H_MASK,
> > vm.vactive << CHN_SCREEN_H_SHIFT);
> >
> > + /* Configure channel interlace buffer control */
> > + zx_writel_mask(zcrtc->chnreg + CHN_INTERLACE_BUF_CTRL, CHN_INTERLACE_EN,
> > + interlaced ? CHN_INTERLACE_EN : 0);
> > +
> > /* Update channel */
> > vou_chn_set_update(zcrtc);
> >
> > diff --git a/drivers/gpu/drm/zte/zx_vou_regs.h b/drivers/gpu/drm/zte/zx_vou_regs.h
> > index 193c1ce01fe7..e6ed844e068a 100644
> > --- a/drivers/gpu/drm/zte/zx_vou_regs.h
> > +++ b/drivers/gpu/drm/zte/zx_vou_regs.h
> > @@ -75,6 +75,8 @@
> > #define CHN_SCREEN_H_SHIFT 5
> > #define CHN_SCREEN_H_MASK (0x1fff << CHN_SCREEN_H_SHIFT)
> > #define CHN_UPDATE 0x08
> > +#define CHN_INTERLACE_BUF_CTRL 0x24
>
> Maybe it's my email reader, but it seems like there's an alignment issue here.
It's indeed your email reader.
Shawn
>
> > +#define CHN_INTERLACE_EN BIT(2)
> >
> > /* TIMING_CTRL registers */
> > #define TIMING_TC_ENABLE 0x04
> > @@ -117,6 +119,19 @@
> > #define TIMING_MAIN_SHIFT 0x2c
> > #define TIMING_AUX_SHIFT 0x30
> > #define H_SHIFT_VAL 0x0048
> > +#define V_SHIFT_VAL 0x0001
> > +#define SCAN_CTRL 0x34
> > +#define AUX_PI_EN BIT(19)
> > +#define MAIN_PI_EN BIT(18)
> > +#define AUX_INTERLACE_SEL BIT(1)
> > +#define MAIN_INTERLACE_SEL BIT(0)
> > +#define SEC_V_ACTIVE 0x38
> > +#define SEC_VACT_MAIN_SHIFT 0
> > +#define SEC_VACT_MAIN_MASK (0xffff << SEC_VACT_MAIN_SHIFT)
> > +#define SEC_VACT_AUX_SHIFT 16
> > +#define SEC_VACT_AUX_MASK (0xffff << SEC_VACT_AUX_SHIFT)
> > +#define SEC_MAIN_V_TIMING 0x3c
> > +#define SEC_AUX_V_TIMING 0x40
> > #define TIMING_MAIN_PI_SHIFT 0x68
> > #define TIMING_AUX_PI_SHIFT 0x6c
> > #define H_PI_SHIFT_VAL 0x000f
> > --
> > 1.9.1
> >
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