diff options
author | Koji Matsuoka <koji.matsuoka.xm@renesas.com> | 2015-07-28 20:12:43 +0900 |
---|---|---|
committer | Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com> | 2016-02-23 09:34:32 +0200 |
commit | 6bc2e15cf21cd96eba69ac83ddd37a7994148b16 (patch) | |
tree | 1d54f430befed85fd0a96762ab06dd2f74b69cb0 /drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c | |
parent | drm: rcar-du: lvds: Rename PLLEN bit to PLLON (diff) | |
download | linux-dev-6bc2e15cf21cd96eba69ac83ddd37a7994148b16.tar.xz linux-dev-6bc2e15cf21cd96eba69ac83ddd37a7994148b16.zip |
drm: rcar-du: lvds: Add R-Car Gen3 support
The LVDS encoder differs slightly in Gen3 SoCs in its PLL configuration.
Add support for the Gen3 LVDS PLL parameters and startup procedure.
Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@renesas.com>
Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>
Diffstat (limited to 'drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c')
-rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c | 133 |
1 files changed, 97 insertions, 36 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c index 02acebadf7d6..ef3a50321ecc 100644 --- a/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c +++ b/drivers/gpu/drm/rcar-du/rcar_du_lvdsenc.c @@ -38,22 +38,13 @@ static void rcar_lvds_write(struct rcar_du_lvdsenc *lvds, u32 reg, u32 data) iowrite32(data, lvds->mmio + reg); } -static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds, - struct rcar_du_crtc *rcrtc) +static void rcar_du_lvdsenc_start_gen2(struct rcar_du_lvdsenc *lvds, + struct rcar_du_crtc *rcrtc) { const struct drm_display_mode *mode = &rcrtc->crtc.mode; unsigned int freq = mode->clock; u32 lvdcr0; - u32 lvdhcr; u32 pllcr; - int ret; - - if (lvds->enabled) - return 0; - - ret = clk_prepare_enable(lvds->clock); - if (ret < 0) - return ret; /* PLL clock configuration */ if (freq < 39000) @@ -67,26 +58,6 @@ static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds, rcar_lvds_write(lvds, LVDPLLCR, pllcr); - /* Hardcode the channels and control signals routing for now. - * - * HSYNC -> CTRL0 - * VSYNC -> CTRL1 - * DISP -> CTRL2 - * 0 -> CTRL3 - */ - rcar_lvds_write(lvds, LVDCTRCR, LVDCTRCR_CTR3SEL_ZERO | - LVDCTRCR_CTR2SEL_DISP | LVDCTRCR_CTR1SEL_VSYNC | - LVDCTRCR_CTR0SEL_HSYNC); - - if (rcar_du_needs(lvds->dev, RCAR_DU_QUIRK_LVDS_LANES)) - lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 3) - | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 1); - else - lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 1) - | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 3); - - rcar_lvds_write(lvds, LVDCHCR, lvdhcr); - /* Select the input, hardcode mode 0, enable LVDS operation and turn * bias circuitry on. */ @@ -96,8 +67,10 @@ static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds, rcar_lvds_write(lvds, LVDCR0, lvdcr0); /* Turn all the channels on. */ - rcar_lvds_write(lvds, LVDCR1, LVDCR1_CHSTBY(3) | LVDCR1_CHSTBY(2) | - LVDCR1_CHSTBY(1) | LVDCR1_CHSTBY(0) | LVDCR1_CLKSTBY); + rcar_lvds_write(lvds, LVDCR1, + LVDCR1_CHSTBY_GEN2(3) | LVDCR1_CHSTBY_GEN2(2) | + LVDCR1_CHSTBY_GEN2(1) | LVDCR1_CHSTBY_GEN2(0) | + LVDCR1_CLKSTBY_GEN2); /* Turn the PLL on, wait for the startup delay, and turn the output * on. @@ -109,8 +82,90 @@ static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds, lvdcr0 |= LVDCR0_LVRES; rcar_lvds_write(lvds, LVDCR0, lvdcr0); +} + +static void rcar_du_lvdsenc_start_gen3(struct rcar_du_lvdsenc *lvds, + struct rcar_du_crtc *rcrtc) +{ + const struct drm_display_mode *mode = &rcrtc->crtc.mode; + unsigned int freq = mode->clock; + u32 lvdcr0; + u32 pllcr; + + /* PLL clock configuration */ + if (freq < 42000) + pllcr = LVDPLLCR_PLLDIVCNT_42M; + else if (freq < 85000) + pllcr = LVDPLLCR_PLLDIVCNT_85M; + else if (freq < 128000) + pllcr = LVDPLLCR_PLLDIVCNT_128M; + else + pllcr = LVDPLLCR_PLLDIVCNT_148M; + + rcar_lvds_write(lvds, LVDPLLCR, pllcr); + + /* Turn the PLL on, set it to LVDS normal mode, wait for the startup + * delay and turn the output on. + */ + lvdcr0 = LVDCR0_PLLON; + rcar_lvds_write(lvds, LVDCR0, lvdcr0); + + lvdcr0 |= LVDCR0_PWD; + rcar_lvds_write(lvds, LVDCR0, lvdcr0); + + usleep_range(100, 150); + + lvdcr0 |= LVDCR0_LVRES; + rcar_lvds_write(lvds, LVDCR0, lvdcr0); + + /* Turn all the channels on. */ + rcar_lvds_write(lvds, LVDCR1, + LVDCR1_CHSTBY_GEN3(3) | LVDCR1_CHSTBY_GEN3(2) | + LVDCR1_CHSTBY_GEN3(1) | LVDCR1_CHSTBY_GEN3(0) | + LVDCR1_CLKSTBY_GEN3); +} + +static int rcar_du_lvdsenc_start(struct rcar_du_lvdsenc *lvds, + struct rcar_du_crtc *rcrtc) +{ + u32 lvdhcr; + int ret; + + if (lvds->enabled) + return 0; + + ret = clk_prepare_enable(lvds->clock); + if (ret < 0) + return ret; + + /* Hardcode the channels and control signals routing for now. + * + * HSYNC -> CTRL0 + * VSYNC -> CTRL1 + * DISP -> CTRL2 + * 0 -> CTRL3 + */ + rcar_lvds_write(lvds, LVDCTRCR, LVDCTRCR_CTR3SEL_ZERO | + LVDCTRCR_CTR2SEL_DISP | LVDCTRCR_CTR1SEL_VSYNC | + LVDCTRCR_CTR0SEL_HSYNC); + + if (rcar_du_needs(lvds->dev, RCAR_DU_QUIRK_LVDS_LANES)) + lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 3) + | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 1); + else + lvdhcr = LVDCHCR_CHSEL_CH(0, 0) | LVDCHCR_CHSEL_CH(1, 1) + | LVDCHCR_CHSEL_CH(2, 2) | LVDCHCR_CHSEL_CH(3, 3); + + rcar_lvds_write(lvds, LVDCHCR, lvdhcr); + + /* Perform generation-specific initialization. */ + if (lvds->dev->info->gen < 3) + rcar_du_lvdsenc_start_gen2(lvds, rcrtc); + else + rcar_du_lvdsenc_start_gen3(lvds, rcrtc); lvds->enabled = true; + return 0; } @@ -143,10 +198,16 @@ int rcar_du_lvdsenc_enable(struct rcar_du_lvdsenc *lvds, struct drm_crtc *crtc, void rcar_du_lvdsenc_atomic_check(struct rcar_du_lvdsenc *lvds, struct drm_display_mode *mode) { - /* The internal LVDS encoder has a clock frequency operating range of - * 30MHz to 150MHz. Clamp the clock accordingly. + struct rcar_du_device *rcdu = lvds->dev; + + /* The internal LVDS encoder has a restricted clock frequency operating + * range (30MHz to 150MHz on Gen2, 25.175MHz to 148.5MHz on Gen3). Clamp + * the clock accordingly. */ - mode->clock = clamp(mode->clock, 30000, 150000); + if (rcdu->info->gen < 3) + mode->clock = clamp(mode->clock, 30000, 150000); + else + mode->clock = clamp(mode->clock, 25175, 148500); } static int rcar_du_lvdsenc_get_resources(struct rcar_du_lvdsenc *lvds, |