diff options
| -rw-r--r-- | drivers/gpu/drm/Makefile | 2 | ||||
| -rw-r--r-- | drivers/gpu/drm/rcar-du/Kconfig | 1 | ||||
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_lvds.c | 77 | ||||
| -rw-r--r-- | drivers/gpu/drm/rcar-du/rcar_lvds.h | 27 |
4 files changed, 96 insertions, 11 deletions
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile index f0c1f8731a27..1ac55c65eac0 100644 --- a/drivers/gpu/drm/Makefile +++ b/drivers/gpu/drm/Makefile @@ -81,7 +81,7 @@ obj-$(CONFIG_DRM_UDL) += udl/ obj-$(CONFIG_DRM_AST) += ast/ obj-$(CONFIG_DRM_ARMADA) += armada/ obj-$(CONFIG_DRM_ATMEL_HLCDC) += atmel-hlcdc/ -obj-$(CONFIG_DRM_RCAR_DU) += rcar-du/ +obj-y += rcar-du/ obj-$(CONFIG_DRM_SHMOBILE) +=shmobile/ obj-y += omapdrm/ obj-$(CONFIG_DRM_SUN4I) += sun4i/ diff --git a/drivers/gpu/drm/rcar-du/Kconfig b/drivers/gpu/drm/rcar-du/Kconfig index 225141656e19..7c36e2777a15 100644 --- a/drivers/gpu/drm/rcar-du/Kconfig +++ b/drivers/gpu/drm/rcar-du/Kconfig @@ -4,6 +4,7 @@ config DRM_RCAR_DU depends on DRM && OF depends on ARM || ARM64 depends on ARCH_RENESAS || COMPILE_TEST + imply DRM_RCAR_LVDS select DRM_KMS_HELPER select DRM_KMS_CMA_HELPER select DRM_GEM_CMA_HELPER diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c index a7789c5b3880..7ef97b2a6eda 100644 --- a/drivers/gpu/drm/rcar-du/rcar_lvds.c +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c @@ -23,6 +23,7 @@ #include <drm/drm_panel.h> #include <drm/drm_probe_helper.h> +#include "rcar_lvds.h" #include "rcar_lvds_regs.h" struct rcar_lvds; @@ -183,8 +184,9 @@ struct pll_info { static void rcar_lvds_d3_e3_pll_calc(struct rcar_lvds *lvds, struct clk *clk, unsigned long target, struct pll_info *pll, - u32 clksel) + u32 clksel, bool dot_clock_only) { + unsigned int div7 = dot_clock_only ? 1 : 7; unsigned long output; unsigned long fin; unsigned int m_min; @@ -218,9 +220,9 @@ static void rcar_lvds_d3_e3_pll_calc(struct rcar_lvds *lvds, struct clk *clk, * `------------> | | * |/ * - * The /7 divider is optional when the LVDS PLL is used to generate a - * dot clock for the DU RGB output, without using the LVDS encoder. We - * don't support this configuration yet. + * The /7 divider is optional, it is enabled when the LVDS PLL is used + * to drive the LVDS encoder, and disabled when used to generate a dot + * clock for the DU RGB output, without using the LVDS encoder. * * The PLL allowed input frequency range is 12 MHz to 192 MHz. */ @@ -280,7 +282,7 @@ static void rcar_lvds_d3_e3_pll_calc(struct rcar_lvds *lvds, struct clk *clk, * the PLL, followed by a an optional fixed /7 * divider. */ - fout = fvco / (1 << e) / 7; + fout = fvco / (1 << e) / div7; div = DIV_ROUND_CLOSEST(fout, target); diff = abs(fout / div - target); @@ -301,7 +303,7 @@ static void rcar_lvds_d3_e3_pll_calc(struct rcar_lvds *lvds, struct clk *clk, done: output = fin * pll->pll_n / pll->pll_m / (1 << pll->pll_e) - / 7 / pll->div; + / div7 / pll->div; error = (long)(output - target) * 10000 / (long)target; dev_dbg(lvds->dev, @@ -311,17 +313,18 @@ done: pll->pll_m, pll->pll_n, pll->pll_e, pll->div); } -static void rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, unsigned int freq) +static void __rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, + unsigned int freq, bool dot_clock_only) { struct pll_info pll = { .diff = (unsigned long)-1 }; u32 lvdpllcr; rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.dotclkin[0], freq, &pll, - LVDPLLCR_CKSEL_DU_DOTCLKIN(0)); + LVDPLLCR_CKSEL_DU_DOTCLKIN(0), dot_clock_only); rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.dotclkin[1], freq, &pll, - LVDPLLCR_CKSEL_DU_DOTCLKIN(1)); + LVDPLLCR_CKSEL_DU_DOTCLKIN(1), dot_clock_only); rcar_lvds_d3_e3_pll_calc(lvds, lvds->clocks.extal, freq, &pll, - LVDPLLCR_CKSEL_EXTAL); + LVDPLLCR_CKSEL_EXTAL, dot_clock_only); lvdpllcr = LVDPLLCR_PLLON | pll.clksel | LVDPLLCR_CLKOUT | LVDPLLCR_PLLN(pll.pll_n - 1) | LVDPLLCR_PLLM(pll.pll_m - 1); @@ -330,6 +333,9 @@ static void rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, unsigned int freq) lvdpllcr |= LVDPLLCR_STP_CLKOUTE | LVDPLLCR_OUTCLKSEL | LVDPLLCR_PLLE(pll.pll_e - 1); + if (dot_clock_only) + lvdpllcr |= LVDPLLCR_OCKSEL; + rcar_lvds_write(lvds, LVDPLLCR, lvdpllcr); if (pll.div > 1) @@ -343,6 +349,57 @@ static void rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, unsigned int freq) rcar_lvds_write(lvds, LVDDIV, 0); } +static void rcar_lvds_pll_setup_d3_e3(struct rcar_lvds *lvds, unsigned int freq) +{ + __rcar_lvds_pll_setup_d3_e3(lvds, freq, false); +} + +/* ----------------------------------------------------------------------------- + * Clock - D3/E3 only + */ + +int rcar_lvds_clk_enable(struct drm_bridge *bridge, unsigned long freq) +{ + struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge); + int ret; + + if (WARN_ON(!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL))) + return -ENODEV; + + dev_dbg(lvds->dev, "enabling LVDS PLL, freq=%luHz\n", freq); + + WARN_ON(lvds->enabled); + + ret = clk_prepare_enable(lvds->clocks.mod); + if (ret < 0) + return ret; + + __rcar_lvds_pll_setup_d3_e3(lvds, freq, true); + + lvds->enabled = true; + return 0; +} +EXPORT_SYMBOL_GPL(rcar_lvds_clk_enable); + +void rcar_lvds_clk_disable(struct drm_bridge *bridge) +{ + struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge); + + if (WARN_ON(!(lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL))) + return; + + dev_dbg(lvds->dev, "disabling LVDS PLL\n"); + + WARN_ON(!lvds->enabled); + + rcar_lvds_write(lvds, LVDPLLCR, 0); + + clk_disable_unprepare(lvds->clocks.mod); + + lvds->enabled = false; +} +EXPORT_SYMBOL_GPL(rcar_lvds_clk_disable); + /* ----------------------------------------------------------------------------- * Bridge */ diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.h b/drivers/gpu/drm/rcar-du/rcar_lvds.h new file mode 100644 index 000000000000..a709cae1bc32 --- /dev/null +++ b/drivers/gpu/drm/rcar-du/rcar_lvds.h @@ -0,0 +1,27 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * rcar_lvds.h -- R-Car LVDS Encoder + * + * Copyright (C) 2013-2018 Renesas Electronics Corporation + * + * Contact: Laurent Pinchart (laurent.pinchart@ideasonboard.com) + */ + +#ifndef __RCAR_LVDS_H__ +#define __RCAR_LVDS_H__ + +struct drm_bridge; + +#if IS_ENABLED(CONFIG_DRM_RCAR_LVDS) +int rcar_lvds_clk_enable(struct drm_bridge *bridge, unsigned long freq); +void rcar_lvds_clk_disable(struct drm_bridge *bridge); +#else +static inline int rcar_lvds_clk_enable(struct drm_bridge *bridge, + unsigned long freq) +{ + return -ENOSYS; +} +static inline void rcar_lvds_clk_disable(struct drm_bridge *bridge) { } +#endif /* CONFIG_DRM_RCAR_LVDS */ + +#endif /* __RCAR_LVDS_H__ */ |