[PATCH v2 1/5] drm: zte: add interlace mode support
Sean Paul
seanpaul at chromium.org
Thu Jan 26 18:37:59 UTC 2017
On Thu, Jan 26, 2017 at 11:20:49PM +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.
>
Reviewed-by: Sean Paul <seanpaul at chromium.org>
> Signed-off-by: Shawn Guo <shawn.guo at linaro.org>
> ---
> Changes for v2:
> - Save the use of variable 'vactive' by checking interlaced case.
> - Rename mask variable for scan register to avoid naming scope
> confusion.
> - Write a proper comment to explain how vback_porch of the first
> and second field are related.
>
> drivers/gpu/drm/zte/zx_vou.c | 52 +++++++++++++++++++++++++++++++++++++--
> drivers/gpu/drm/zte/zx_vou_regs.h | 15 +++++++++++
> 2 files changed, 65 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/zte/zx_vou.c b/drivers/gpu/drm/zte/zx_vou.c
> index 3056b41df518..fe066e0f3df4 100644
> --- a/drivers/gpu/drm/zte/zx_vou.c
> +++ b/drivers/gpu/drm/zte/zx_vou.c
> @@ -40,6 +40,7 @@ struct zx_crtc_regs {
> u32 fir_active;
> u32 fir_htiming;
> u32 fir_vtiming;
> + u32 sec_vtiming;
> u32 timing_shift;
> u32 timing_pi_shift;
> };
> @@ -48,6 +49,7 @@ struct zx_crtc_regs {
> .fir_active = FIR_MAIN_ACTIVE,
> .fir_htiming = FIR_MAIN_H_TIMING,
> .fir_vtiming = FIR_MAIN_V_TIMING,
> + .sec_vtiming = SEC_MAIN_V_TIMING,
> .timing_shift = TIMING_MAIN_SHIFT,
> .timing_pi_shift = TIMING_MAIN_PI_SHIFT,
> };
> @@ -56,6 +58,7 @@ struct zx_crtc_regs {
> .fir_active = FIR_AUX_ACTIVE,
> .fir_htiming = FIR_AUX_H_TIMING,
> .fir_vtiming = FIR_AUX_V_TIMING,
> + .sec_vtiming = SEC_AUX_V_TIMING,
> .timing_shift = TIMING_AUX_SHIFT,
> .timing_pi_shift = TIMING_AUX_PI_SHIFT,
> };
> @@ -65,6 +68,10 @@ struct zx_crtc_bits {
> u32 polarity_shift;
> u32 int_frame_mask;
> u32 tc_enable;
> + u32 sec_vactive_shift;
> + u32 sec_vactive_mask;
> + u32 interlace_select;
> + u32 pi_enable;
> };
>
> static const struct zx_crtc_bits main_crtc_bits = {
> @@ -72,6 +79,10 @@ struct zx_crtc_bits {
> .polarity_shift = MAIN_POL_SHIFT,
> .int_frame_mask = TIMING_INT_MAIN_FRAME,
> .tc_enable = MAIN_TC_EN,
> + .sec_vactive_shift = SEC_VACT_MAIN_SHIFT,
> + .sec_vactive_mask = SEC_VACT_MAIN_MASK,
> + .interlace_select = MAIN_INTERLACE_SEL,
> + .pi_enable = MAIN_PI_EN,
> };
>
> static const struct zx_crtc_bits aux_crtc_bits = {
> @@ -79,6 +90,10 @@ struct zx_crtc_bits {
> .polarity_shift = AUX_POL_SHIFT,
> .int_frame_mask = TIMING_INT_AUX_FRAME,
> .tc_enable = AUX_TC_EN,
> + .sec_vactive_shift = SEC_VACT_AUX_SHIFT,
> + .sec_vactive_mask = SEC_VACT_AUX_MASK,
> + .interlace_select = AUX_INTERLACE_SEL,
> + .pi_enable = AUX_PI_EN,
> };
>
> struct zx_crtc {
> @@ -196,11 +211,13 @@ 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 scan_mask;
> u32 pol = 0;
> u32 val;
> int ret;
> @@ -208,7 +225,7 @@ static void zx_crtc_enable(struct drm_crtc *crtc)
> drm_display_mode_to_videomode(mode, &vm);
>
> /* Set up timing parameters */
> - val = V_ACTIVE(vm.vactive - 1);
> + val = V_ACTIVE((interlaced ? vm.vactive / 2 : vm.vactive) - 1);
> val |= H_ACTIVE(vm.hactive - 1);
> zx_writel(vou->timing + regs->fir_active, val);
>
> @@ -222,6 +239,25 @@ 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;
> +
> + val = zx_readl(vou->timing + SEC_V_ACTIVE);
> + val &= ~mask;
> + val |= ((vm.vactive / 2 - 1) << shift) & mask;
> + zx_writel(vou->timing + SEC_V_ACTIVE, val);
> +
> + val = SYNC_WIDE(vm.vsync_len - 1);
> + /*
> + * The vback_porch for the second field needs to shift one on
> + * the value for the first field.
> + */
> + 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 +268,17 @@ 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 */
> + scan_mask = bits->interlace_select | bits->pi_enable;
> + zx_writel_mask(vou->timing + SCAN_CTRL, scan_mask,
> + interlaced ? scan_mask : 0);
> +
> /* Enable TIMING_CTRL */
> zx_writel_mask(vou->timing + TIMING_TC_ENABLE, bits->tc_enable,
> bits->tc_enable);
> @@ -245,6 +289,10 @@ 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
> +#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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--
Sean Paul, Software Engineer, Google / Chromium OS
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