drm: rcar-du: lvds: Add API to enable/disable clock output

On the D3 and E3 platforms, the LVDS internal PLL supplies the pixel
clock to the DU. This works automatically for LVDS outputs as the LVDS
encoder is enabled through the bridge API, enabling the internal PLL and
clock output. However, when using the DU DPAD output with the LVDS
outputs turned off, the LVDS PLL needs to be controlled manually. Add an
API to do so, to be called by the DU driver.

The drivers/gpu/drm/rcar-du/ directory has to be treated as obj-y
unconditionally, as the LVDS driver could be built-in while the DU
driver is compiled as a module.

Signed-off-by: Laurent Pinchart <laurent.pinchart+renesas@ideasonboard.com>

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index f0c1f8731a2761ed4d1408ced0a8f05c1cc7993d..1ac55c65eac0dc42700aac97c827391527ba4580 100644 (file)
--- 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 225141656e1903758e096561521629e7154bf78c..7c36e2777a154e98c233a2eb153e4be4c9811299 100644 (file)
--- 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 a7789c5b3880138b1bf7e58074ab0eeedd4b4233..7ef97b2a6edaa63a2c8b0f4638c1e5f18f4f2dc5 100644 (file)
--- 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 (file)
index 0000000..a709cae
--- /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__ */