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drm/sun4i: frontend: Apply format sub-sampling to CH1 dimensions

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The frontend comes with two "channels", that can be configured
independently. When used in YUV mode, the first channel (CH0) represents
the luminance component while the second channel (CH1) represents the
chrominance. In RGB mode, both have to be configured the same way.

Use variables (with the YUV terminology) for each channel's
dimensions, calculating the chroma dimensions from the luma dimensions
and the sub-sampling factors from the format description.

Since the configured size only has pixel precision, the fractional
fixed-point part of the source size is dropped for both components to
ensure that the scaling factors are accurate.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20181123092515.2511-26-paul.kocialkowski@bootlin.com
This commit is contained in:
Paul Kocialkowski 2018-11-23 10:24:57 +01:00 committed by Maxime Ripard
parent dc7d4b655a
commit 411e83069e
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GPG key ID: E3EF0D6F671851C5
1 changed files with 16 additions and 8 deletions
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24
drivers/gpu/drm/sun4i/sun4i_frontend.c
View file

@ -239,16 +239,24 @@ void sun4i_frontend_update_coord(struct sun4i_frontend *frontend,
struct drm_plane *plane)
{
struct drm_plane_state *state = plane->state;
struct drm_framebuffer *fb = state->fb;
uint32_t luma_width, luma_height;
uint32_t chroma_width, chroma_height;
/* Set height and width */
DRM_DEBUG_DRIVER("Frontend size W: %u H: %u\n",
state->crtc_w, state->crtc_h);
luma_width = state->src_w >> 16;
luma_height = state->src_h >> 16;
chroma_width = DIV_ROUND_UP(luma_width, fb->format->hsub);
chroma_height = DIV_ROUND_UP(luma_height, fb->format->vsub);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_INSIZE_REG,
SUN4I_FRONTEND_INSIZE(state->src_h >> 16,
state->src_w >> 16));
SUN4I_FRONTEND_INSIZE(luma_height, luma_width));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_INSIZE_REG,
SUN4I_FRONTEND_INSIZE(state->src_h >> 16,
state->src_w >> 16));
SUN4I_FRONTEND_INSIZE(chroma_height, chroma_width));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_OUTSIZE_REG,
SUN4I_FRONTEND_OUTSIZE(state->crtc_h, state->crtc_w));
@ -256,14 +264,14 @@ void sun4i_frontend_update_coord(struct sun4i_frontend *frontend,
SUN4I_FRONTEND_OUTSIZE(state->crtc_h, state->crtc_w));
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_HORZFACT_REG,
state->src_w / state->crtc_w);
(luma_width << 16) / state->crtc_w);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_HORZFACT_REG,
state->src_w / state->crtc_w);
(chroma_width << 16) / state->crtc_w);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH0_VERTFACT_REG,
state->src_h / state->crtc_h);
(luma_height << 16) / state->crtc_h);
regmap_write(frontend->regs, SUN4I_FRONTEND_CH1_VERTFACT_REG,
state->src_h / state->crtc_h);
(chroma_height << 16) / state->crtc_h);
regmap_write_bits(frontend->regs, SUN4I_FRONTEND_FRM_CTRL_REG,
SUN4I_FRONTEND_FRM_CTRL_REG_RDY,