Retrieve the LVDS mode from the panel and configure the LVDS encoder accordingly. LVDS mode selection is static as LVDS panels can't be hot-plugged on any of the device supported by the driver. Support for dynamic mode selection can be implemented in the future when needed.
Signed-off-by: Laurent Pinchart laurent.pinchart+renesas@ideasonboard.com --- Changes since v2:
- Rebased on top of the DRM_BUS_FLAG_DATA_MIRROR rename. --- drivers/gpu/drm/rcar-du/rcar_du_encoder.c | 27 +++++++++++++++++++++++++++ drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c | 11 +++++++++-- drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h | 13 +++++++++++++ 3 files changed, 49 insertions(+), 2 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c index 31f878ad099d..3a3c9374794e 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_encoder.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_encoder.c @@ -98,6 +98,8 @@ static void rcar_du_encoder_mode_set(struct drm_encoder *encoder, struct drm_connector_state *conn_state) { struct rcar_du_encoder *renc = to_rcar_encoder(encoder); + struct drm_display_info *info = &conn_state->connector->display_info; + enum rcar_lvds_mode mode;
rcar_du_crtc_route_output(crtc_state->crtc, renc->output);
@@ -111,6 +113,31 @@ static void rcar_du_encoder_mode_set(struct drm_encoder *encoder, }
renc->connector = to_rcar_connector(conn_state->connector); + + if (!info->num_bus_formats || !info->bus_formats) { + dev_err(encoder->dev->dev, "no LVDS bus format reported\n"); + return; + } + + switch (info->bus_formats[0]) { + case MEDIA_BUS_FMT_RGB666_1X7X3_SPWG: + case MEDIA_BUS_FMT_RGB888_1X7X4_JEIDA: + mode = RCAR_LVDS_MODE_JEIDA; + break; + case MEDIA_BUS_FMT_RGB888_1X7X4_SPWG: + mode = RCAR_LVDS_MODE_VESA; + break; + default: + dev_err(encoder->dev->dev, + "unsupported LVDS bus format 0x%04x\n", + info->bus_formats[0]); + return; + } + + if (info->bus_flags & DRM_BUS_FLAG_DATA_LSB_TO_MSB) + mode |= RCAR_LVDS_MODE_MIRROR; + + rcar_du_lvdsenc_set_mode(renc->lvds, mode); }
static const struct drm_encoder_helper_funcs encoder_helper_funcs = { diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c index e3a4985f6f3f..1661f6201210 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c @@ -31,6 +31,7 @@ struct rcar_du_lvdsenc { bool enabled;
enum rcar_lvds_input input; + enum rcar_lvds_mode mode; };
static void rcar_lvds_write(struct rcar_du_lvdsenc *lvds, u32 reg, u32 data) @@ -61,7 +62,7 @@ static void rcar_du_lvdsenc_start_gen2(struct rcar_du_lvdsenc *lvds, /* Select the input, hardcode mode 0, enable LVDS operation and turn * bias circuitry on. */ - lvdcr0 = LVDCR0_BEN | LVDCR0_LVEN; + lvdcr0 = (lvds->mode << LVDCR0_LVMD_SHIFT) | LVDCR0_BEN | LVDCR0_LVEN; if (rcrtc->index == 2) lvdcr0 |= LVDCR0_DUSEL; rcar_lvds_write(lvds, LVDCR0, lvdcr0); @@ -114,7 +115,7 @@ static void rcar_du_lvdsenc_start_gen3(struct rcar_du_lvdsenc *lvds, * Turn the PLL on, set it to LVDS normal mode, wait for the startup * delay and turn the output on. */ - lvdcr0 = LVDCR0_PLLON; + lvdcr0 = (lvds->mode << LVDCR0_LVMD_SHIFT) | LVDCR0_PLLON; rcar_lvds_write(lvds, LVDCR0, lvdcr0);
lvdcr0 |= LVDCR0_PWD; @@ -211,6 +212,12 @@ void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds, mode->clock = clamp(mode->clock, 25175, 148500); }
+void rcar_du_lvdsenc_set_mode(struct rcar_du_lvdsenc *lvds, + enum rcar_lvds_mode mode) +{ + lvds->mode = mode; +} + static int rcar_du_lvdsenc_get_resources(struct rcar_du_lvdsenc *lvds, struct platform_device *pdev) { diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h index dfdba746edf4..7218ac89333e 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.h @@ -26,8 +26,17 @@ enum rcar_lvds_input { RCAR_LVDS_INPUT_DU2, };
+/* Keep in sync with the LVDCR0.LVMD hardware register values. */ +enum rcar_lvds_mode { + RCAR_LVDS_MODE_JEIDA = 0, + RCAR_LVDS_MODE_MIRROR = 1, + RCAR_LVDS_MODE_VESA = 4, +}; + #if IS_ENABLED(CONFIG_DRM_RCAR_LVDS) int rcar_du_lvdsenc_init(struct rcar_du_device *rcdu); +void rcar_du_lvdsenc_set_mode(struct rcar_du_lvdsenc *lvds, + enum rcar_lvds_mode mode); int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds, struct drm_crtc *crtc, bool enable); void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds, @@ -37,6 +46,10 @@ static inline int rcar_du_lvdsenc_init(struct rcar_du_device *rcdu) { return 0; } +static inline void rcar_du_lvdsenc_set_mode(struct rcar_du_lvdsenc *lvds, + enum rcar_lvds_mode mode) +{ +} static inline int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds, struct drm_crtc *crtc, bool enable) {