From: Koji Matsuoka <koji.matsuoka.xm@xxxxxxxxxxx>
The workaround of DPLLCR2 register is required at the time of
H3(WS1.0) and H3(WS1.1). This patch adds procedure to apply
the workaround by revision.
Signed-off-by: Koji Matsuoka <koji.matsuoka.xm@xxxxxxxxxxx>
[uli: replace PRR hack with soc_device_match()]
Signed-off-by: Ulrich Hecht <ulrich.hecht+renesas@xxxxxxxxx>
---
drivers/gpu/drm/rcar-du/rcar_du_crtc.c | 88 ++++++++++++++++++++++++++++++++-
drivers/gpu/drm/rcar-du/rcar_du_crtc.h | 8 +++
drivers/gpu/drm/rcar-du/rcar_du_drv.c | 5 ++
drivers/gpu/drm/rcar-du/rcar_du_drv.h | 3 +-
drivers/gpu/drm/rcar-du/rcar_du_plane.h | 7 ++-
drivers/gpu/drm/rcar-du/rcar_du_regs.h | 21 +++++++-
6 files changed, 128 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
index 7316fc7..85e3c53 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.c
@@ -13,6 +13,7 @@
#include <linux/clk.h>
#include <linux/mutex.h>
+#include <linux/sys_soc.h>
#include <drm/drmP.h>
#include <drm/drm_atomic.h>
@@ -106,14 +107,70 @@ static void rcar_du_crtc_put(struct rcar_du_crtc *rcrtc)
* Hardware Setup
*/
+static void rcar_du_dpll_divider(struct dpll_info *dpll, unsigned int extclk,
+ unsigned int mode_clock)
+{
+ unsigned long dpllclk;
+ unsigned long diff;
+ unsigned long n, m, fdpll;
+ bool match_flag = false;
+ bool clk_diff_set = true;
+
+ for (n = 39; n < 120; n++) {
+ for (m = 0; m < 4; m++) {
+ for (fdpll = 1; fdpll < 32; fdpll++) {
+ /* 1/2 (FRQSEL=1) for duty rate 50% */
+ dpllclk = extclk * (n + 1) / (m + 1)
+ / (fdpll + 1) / 2;
+ if (dpllclk >= 400000000)
+ continue;
+
+ diff = abs((long)dpllclk - (long)mode_clock);
+ if (clk_diff_set ||
+ ((diff == 0) || (dpll->diff > diff))) {
+ dpll->diff = diff;
+ dpll->n = n;
+ dpll->m = m;
+ dpll->fdpll = fdpll;
+ dpll->dpllclk = dpllclk;
+
+ if (clk_diff_set)
+ clk_diff_set = false;
+
+ if (diff == 0) {
+ match_flag = true;
+ break;
+ }
+ }
+ }
+ if (match_flag)
+ break;
+ }
+ if (match_flag)
+ break;
+ }
+}
+
+static const struct soc_device_attribute r8a7795es1[] = {
+ { .soc_id = "r8a7795", .revision = "ES1.*" },
+ { /* sentinel */ }
+};
+
static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
{
const struct drm_display_mode *mode = &rcrtc->crtc.state->adjusted_mode;
+ struct rcar_du_device *rcdu = rcrtc->group->dev;
unsigned long mode_clock = mode->clock * 1000;
unsigned long clk;
u32 value;
u32 escr;
u32 div;
+ u32 dpll_reg = 0;
+ struct dpll_info *dpll;
+
+ dpll = kzalloc(sizeof(*dpll), GFP_KERNEL);
+ if (dpll == NULL)
+ return;
/* Compute the clock divisor and select the internal or external dot
* clock based on the requested frequency.
@@ -130,6 +187,15 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
u32 extdiv;
extclk = clk_get_rate(rcrtc->extclock);
+
+ if (rcdu->info->dpll_ch & (0x01 << rcrtc->index)) {
+ rcar_du_dpll_divider(dpll, extclk, mode_clock);
+ extclk = dpll->dpllclk;
+ dev_dbg(rcrtc->group->dev->dev,
+ "dpllclk:%d, fdpll:%d, n:%d, m:%d, diff:%d\n",
+ dpll->dpllclk, dpll->fdpll, dpll->n, dpll->m,
+ dpll->diff);
+ }
extdiv = DIV_ROUND_CLOSEST(extclk, mode_clock);
extdiv = clamp(extdiv, 1U, 64U) - 1;
@@ -140,7 +206,27 @@ static void rcar_du_crtc_set_display_timing(struct rcar_du_crtc *rcrtc)
abs((long)rate - (long)mode_clock)) {
dev_dbg(rcrtc->group->dev->dev,
"crtc%u: using external clock\n", rcrtc->index);
- escr = extdiv | ESCR_DCLKSEL_DCLKIN;
+ if (rcdu->info->dpll_ch & (0x01 << rcrtc->index)) {
+ escr = ESCR_DCLKSEL_DCLKIN | 0x01;
+ dpll_reg = DPLLCR_CODE | DPLLCR_M(dpll->m) |
+ DPLLCR_FDPLL(dpll->fdpll) |
+ DPLLCR_CLKE | DPLLCR_N(dpll->n) |
+ DPLLCR_STBY;
+
+ if (rcrtc->index == DU_CH_1)
+ dpll_reg |= (DPLLCR_PLCS1 |
+ DPLLCR_INCS_DPLL01_DOTCLKIN13);
+ if (rcrtc->index == DU_CH_2) {
+ dpll_reg |= (DPLLCR_PLCS0 |
+ DPLLCR_INCS_DPLL01_DOTCLKIN02);
+ if (soc_device_match(r8a7795es1))
+ dpll_reg |= (0x01 << 21);
+ }
+
+ rcar_du_group_write(rcrtc->group, DPLLCR,
+ dpll_reg);
+ } else
+ escr = extdiv | ESCR_DCLKSEL_DCLKIN;
}
}
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
index 459e539..9a56cc7 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_crtc.h
@@ -54,6 +54,14 @@ struct rcar_du_crtc {
struct rcar_du_vsp *vsp;
};
+struct dpll_info {
+ unsigned int dpllclk;
+ unsigned int diff;
+ unsigned int fdpll;
+ unsigned int n;
+ unsigned int m;
+};
+
#define to_rcar_crtc(c) container_of(c, struct rcar_du_crtc, crtc)
enum rcar_du_output {
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.c b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
index 4d0ae8a..d968fa9 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.c
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.c
@@ -55,6 +55,7 @@ static const struct rcar_du_device_info rcar_du_r8a7779_info = {
},
},
.num_lvds = 0,
+ .dpll_ch = 0,
};
static const struct rcar_du_device_info rcar_du_r8a7790_info = {
@@ -84,6 +85,7 @@ static const struct rcar_du_device_info rcar_du_r8a7790_info = {
},
},
.num_lvds = 2,
+ .dpll_ch = 0,
};
/* M2-W (r8a7791) and M2-N (r8a7793) are identical */
@@ -108,6 +110,7 @@ static const struct rcar_du_device_info rcar_du_r8a7791_info = {
},
},
.num_lvds = 1,
+ .dpll_ch = 0,
};
static const struct rcar_du_device_info rcar_du_r8a7794_info = {
@@ -131,6 +134,7 @@ static const struct rcar_du_device_info rcar_du_r8a7794_info = {
},
},
.num_lvds = 0,
+ .dpll_ch = 0,
};
static const struct rcar_du_device_info rcar_du_r8a7795_info = {
@@ -165,6 +169,7 @@ static const struct rcar_du_device_info rcar_du_r8a7795_info = {
},
},
.num_lvds = 1,
+ .dpll_ch = BIT(1) | BIT(2),
};
static const struct of_device_id rcar_du_of_table[] = {
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_drv.h b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
index c9db610..6366d24 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_drv.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_drv.h
@@ -1,7 +1,7 @@
/*
* rcar_du_drv.h -- R-Car Display Unit DRM driver
*
- * Copyright (C) 2013-2015 Renesas Electronics Corporation
+ * Copyright (C) 2013-2016 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@xxxxxxxxxxxxxxxx)
*
@@ -69,6 +69,7 @@ struct rcar_du_device_info {
unsigned int num_crtcs;
struct rcar_du_output_routing routes[RCAR_DU_OUTPUT_MAX];
unsigned int num_lvds;
+ unsigned int dpll_ch;
};
#define RCAR_DU_MAX_CRTCS 4
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_plane.h b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
index 8b91dd3..c1de338 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_plane.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_plane.h
@@ -1,7 +1,7 @@
/*
* rcar_du_plane.h -- R-Car Display Unit Planes
*
- * Copyright (C) 2013-2014 Renesas Electronics Corporation
+ * Copyright (C) 2013-2016 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@xxxxxxxxxxxxxxxx)
*
@@ -34,6 +34,11 @@ enum rcar_du_plane_source {
RCAR_DU_PLANE_VSPD1,
};
+#define DU_CH_0 0
+#define DU_CH_1 1
+#define DU_CH_2 2
+#define DU_CH_3 3
+
struct rcar_du_plane {
struct drm_plane plane;
struct rcar_du_group *group;
diff --git a/drivers/gpu/drm/rcar-du/rcar_du_regs.h b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
index fedb016..513a716 100644
--- a/drivers/gpu/drm/rcar-du/rcar_du_regs.h
+++ b/drivers/gpu/drm/rcar-du/rcar_du_regs.h
@@ -1,7 +1,7 @@
/*
* rcar_du_regs.h -- R-Car Display Unit Registers Definitions
*
- * Copyright (C) 2013-2015 Renesas Electronics Corporation
+ * Copyright (C) 2013-2016 Renesas Electronics Corporation
*
* Contact: Laurent Pinchart (laurent.pinchart@xxxxxxxxxxxxxxxx)
*
@@ -277,6 +277,25 @@
#define DEFR10_TSEL_H3_TCON1 (0 << 1) /* DEFR102 register only (DU2/DU3) */
#define DEFR10_DEFE10 (1 << 0)
+#define DPLLCR 0x20044
+#define DPLLCR_CODE (0x95 << 24)
+#define DPLLCR_PLCS1 (1 << 23)
+#define DPLLCR_PLCS0 (1 << 20)
+#define DPLLCR_CLKE (1 << 18)
+#define DPLLCR_FDPLL(n) ((n) << 12) /* n=0 Setting prohibited */
+/* H'00 to H'26, H'78 to H'7F: Setting prohibited.*/
+#define DPLLCR_N(n) ((n) << 5)
+#define DPLLCR_M(n) ((n) << 3)
+#define DPLLCR_STBY (1 << 2)
+#define DPLLCR_INCS_DPLL01_DOTCLKIN02 (0 << 0)
+#define DPLLCR_INCS_DPLL01_DOTCLKIN13 (1 << 1)
+
+#define DPLLC2R 0x20048
+#define DPLLC2R_CODE (0x95 << 24)
+#define DPLLC2R_SELC (1 << 12)
+#define DPLLC2R_M(n) ((n) << 8)
+#define DPLLC2R_FDPLL(n) ((n) << 0) /* n=0 Setting prohibited */
+
/* -----------------------------------------------------------------------------
* Display Timing Generation Registers
*/
--
2.7.4
