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path: root/drivers/gpu/drm/rcar-du/rcar_lvds.c
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Diffstat (limited to 'drivers/gpu/drm/rcar-du/rcar_lvds.c')
-rw-r--r--drivers/gpu/drm/rcar-du/rcar_lvds.c103
1 files changed, 88 insertions, 15 deletions
diff --git a/drivers/gpu/drm/rcar-du/rcar_lvds.c b/drivers/gpu/drm/rcar-du/rcar_lvds.c
index 534a128a869d..7ef97b2a6eda 100644
--- a/drivers/gpu/drm/rcar-du/rcar_lvds.c
+++ b/drivers/gpu/drm/rcar-du/rcar_lvds.c
@@ -10,6 +10,7 @@
#include <linux/clk.h>
#include <linux/delay.h>
#include <linux/io.h>
+#include <linux/module.h>
#include <linux/of.h>
#include <linux/of_device.h>
#include <linux/of_graph.h>
@@ -19,9 +20,10 @@
#include <drm/drm_atomic.h>
#include <drm/drm_atomic_helper.h>
#include <drm/drm_bridge.h>
-#include <drm/drm_crtc_helper.h>
#include <drm/drm_panel.h>
+#include <drm/drm_probe_helper.h>
+#include "rcar_lvds.h"
#include "rcar_lvds_regs.h"
struct rcar_lvds;
@@ -182,8 +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;
@@ -217,9 +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.
*/
@@ -279,7 +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);
@@ -300,7 +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,
@@ -310,17 +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);
@@ -329,6 +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)
@@ -342,6 +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
*/
@@ -520,8 +578,8 @@ static void rcar_lvds_get_lvds_mode(struct rcar_lvds *lvds)
}
static void rcar_lvds_mode_set(struct drm_bridge *bridge,
- struct drm_display_mode *mode,
- struct drm_display_mode *adjusted_mode)
+ const struct drm_display_mode *mode,
+ const struct drm_display_mode *adjusted_mode)
{
struct rcar_lvds *lvds = bridge_to_rcar_lvds(bridge);
@@ -544,7 +602,10 @@ static int rcar_lvds_attach(struct drm_bridge *bridge)
return drm_bridge_attach(bridge->encoder, lvds->next_bridge,
bridge);
- /* Otherwise we have a panel, create a connector. */
+ /* Otherwise if we have a panel, create a connector. */
+ if (!lvds->panel)
+ return 0;
+
ret = drm_connector_init(bridge->dev, connector, &rcar_lvds_conn_funcs,
DRM_MODE_CONNECTOR_LVDS);
if (ret < 0)
@@ -592,7 +653,8 @@ static int rcar_lvds_parse_dt(struct rcar_lvds *lvds)
local_output = of_graph_get_endpoint_by_regs(lvds->dev->of_node, 1, 0);
if (!local_output) {
dev_dbg(lvds->dev, "unconnected port@1\n");
- return -ENODEV;
+ ret = -ENODEV;
+ goto done;
}
/*
@@ -642,6 +704,15 @@ done:
of_node_put(remote_input);
of_node_put(remote);
+ /*
+ * On D3/E3 the LVDS encoder provides a clock to the DU, which can be
+ * used for the DPAD output even when the LVDS output is not connected.
+ * Don't fail probe in that case as the DU will need the bridge to
+ * control the clock.
+ */
+ if (lvds->info->quirks & RCAR_LVDS_QUIRK_EXT_PLL)
+ return ret == -ENODEV ? 0 : ret;
+
return ret;
}
@@ -785,6 +856,8 @@ static const struct rcar_lvds_device_info rcar_lvds_r8a77995_info = {
static const struct of_device_id rcar_lvds_of_table[] = {
{ .compatible = "renesas,r8a7743-lvds", .data = &rcar_lvds_gen2_info },
+ { .compatible = "renesas,r8a7744-lvds", .data = &rcar_lvds_gen2_info },
+ { .compatible = "renesas,r8a774c0-lvds", .data = &rcar_lvds_r8a77990_info },
{ .compatible = "renesas,r8a7790-lvds", .data = &rcar_lvds_r8a7790_info },
{ .compatible = "renesas,r8a7791-lvds", .data = &rcar_lvds_gen2_info },
{ .compatible = "renesas,r8a7793-lvds", .data = &rcar_lvds_gen2_info },
generated by cgit v1.2.3 (git 2.46.0) at 2025-10-31 10:47:54 +0000