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Subject[PATCH 1/5] drm/stm: ltdc: switch to regmap
Date
Replace the legacy register access by regmap API.

Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
---
drivers/gpu/drm/stm/ltdc.c | 138 ++++++++++++++++++-------------------
drivers/gpu/drm/stm/ltdc.h | 1 +
2 files changed, 68 insertions(+), 71 deletions(-)

diff --git a/drivers/gpu/drm/stm/ltdc.c b/drivers/gpu/drm/stm/ltdc.c
index c0619f372630..8dad3d00aa5c 100644
--- a/drivers/gpu/drm/stm/ltdc.c
+++ b/drivers/gpu/drm/stm/ltdc.c
@@ -18,6 +18,7 @@
#include <linux/pinctrl/consumer.h>
#include <linux/platform_device.h>
#include <linux/pm_runtime.h>
+#include <linux/regmap.h>
#include <linux/reset.h>

#include <drm/drm_atomic.h>
@@ -343,31 +344,14 @@ static const u64 ltdc_format_modifiers[] = {
DRM_FORMAT_MOD_INVALID
};

-static inline u32 reg_read(void __iomem *base, u32 reg)
-{
- return readl_relaxed(base + reg);
-}
-
-static inline void reg_write(void __iomem *base, u32 reg, u32 val)
-{
- writel_relaxed(val, base + reg);
-}
-
-static inline void reg_set(void __iomem *base, u32 reg, u32 mask)
-{
- reg_write(base, reg, reg_read(base, reg) | mask);
-}
-
-static inline void reg_clear(void __iomem *base, u32 reg, u32 mask)
-{
- reg_write(base, reg, reg_read(base, reg) & ~mask);
-}
-
-static inline void reg_update_bits(void __iomem *base, u32 reg, u32 mask,
- u32 val)
-{
- reg_write(base, reg, (reg_read(base, reg) & ~mask) | val);
-}
+static const struct regmap_config stm32_ltdc_regmap_cfg = {
+ .reg_bits = 32,
+ .val_bits = 32,
+ .reg_stride = sizeof(u32),
+ .max_register = 0x400,
+ .use_relaxed_mmio = true,
+ .cache_type = REGCACHE_NONE,
+};

static inline struct ltdc_device *crtc_to_ltdc(struct drm_crtc *crtc)
{
@@ -494,9 +478,13 @@ static irqreturn_t ltdc_irq(int irq, void *arg)
struct drm_device *ddev = arg;
struct ltdc_device *ldev = ddev->dev_private;

- /* Read & Clear the interrupt status */
- ldev->irq_status = reg_read(ldev->regs, LTDC_ISR);
- reg_write(ldev->regs, LTDC_ICR, ldev->irq_status);
+ /*
+ * Read & Clear the interrupt status
+ * In order to write / read registers in this critical section
+ * very quickly, the regmap functions are not used.
+ */
+ ldev->irq_status = readl_relaxed(ldev->regs + LTDC_ISR);
+ writel_relaxed(ldev->irq_status, ldev->regs + LTDC_ICR);

return IRQ_WAKE_THREAD;
}
@@ -520,7 +508,7 @@ static void ltdc_crtc_update_clut(struct drm_crtc *crtc)
for (i = 0; i < CLUT_SIZE; i++, lut++) {
val = ((lut->red << 8) & 0xff0000) | (lut->green & 0xff00) |
(lut->blue >> 8) | (i << 24);
- reg_write(ldev->regs, LTDC_L1CLUTWR, val);
+ regmap_write(ldev->regmap, LTDC_L1CLUTWR, val);
}
}

@@ -535,13 +523,13 @@ static void ltdc_crtc_atomic_enable(struct drm_crtc *crtc,
pm_runtime_get_sync(ddev->dev);

/* Sets the background color value */
- reg_write(ldev->regs, LTDC_BCCR, BCCR_BCBLACK);
+ regmap_write(ldev->regmap, LTDC_BCCR, BCCR_BCBLACK);

/* Enable IRQ */
- reg_set(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
+ regmap_set_bits(ldev->regmap, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);

/* Commit shadow registers = update planes at next vblank */
- reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);
+ regmap_set_bits(ldev->regmap, LTDC_SRCR, SRCR_VBR);

drm_crtc_vblank_on(crtc);
}
@@ -557,10 +545,10 @@ static void ltdc_crtc_atomic_disable(struct drm_crtc *crtc,
drm_crtc_vblank_off(crtc);

/* disable IRQ */
- reg_clear(ldev->regs, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);
+ regmap_clear_bits(ldev->regmap, LTDC_IER, IER_RRIE | IER_FUIE | IER_TERRIE);

/* immediately commit disable of layers before switching off LTDC */
- reg_set(ldev->regs, LTDC_SRCR, SRCR_IMR);
+ regmap_set_bits(ldev->regmap, LTDC_SRCR, SRCR_IMR);

pm_runtime_put_sync(ddev->dev);
}
@@ -708,26 +696,26 @@ static void ltdc_crtc_mode_set_nofb(struct drm_crtc *crtc)
if (bus_flags & DRM_BUS_FLAG_PIXDATA_DRIVE_NEGEDGE)
val |= GCR_PCPOL;

- reg_update_bits(ldev->regs, LTDC_GCR,
- GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);
+ regmap_update_bits(ldev->regmap, LTDC_GCR,
+ GCR_HSPOL | GCR_VSPOL | GCR_DEPOL | GCR_PCPOL, val);

/* Set Synchronization size */
val = (hsync << 16) | vsync;
- reg_update_bits(ldev->regs, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);
+ regmap_update_bits(ldev->regmap, LTDC_SSCR, SSCR_VSH | SSCR_HSW, val);

/* Set Accumulated Back porch */
val = (accum_hbp << 16) | accum_vbp;
- reg_update_bits(ldev->regs, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);
+ regmap_update_bits(ldev->regmap, LTDC_BPCR, BPCR_AVBP | BPCR_AHBP, val);

/* Set Accumulated Active Width */
val = (accum_act_w << 16) | accum_act_h;
- reg_update_bits(ldev->regs, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);
+ regmap_update_bits(ldev->regmap, LTDC_AWCR, AWCR_AAW | AWCR_AAH, val);

/* Set total width & height */
val = (total_width << 16) | total_height;
- reg_update_bits(ldev->regs, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);
+ regmap_update_bits(ldev->regmap, LTDC_TWCR, TWCR_TOTALH | TWCR_TOTALW, val);

- reg_write(ldev->regs, LTDC_LIPCR, (accum_act_h + 1));
+ regmap_write(ldev->regmap, LTDC_LIPCR, (accum_act_h + 1));
}

static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
@@ -742,7 +730,7 @@ static void ltdc_crtc_atomic_flush(struct drm_crtc *crtc,
ltdc_crtc_update_clut(crtc);

/* Commit shadow registers = update planes at next vblank */
- reg_set(ldev->regs, LTDC_SRCR, SRCR_VBR);
+ regmap_set_bits(ldev->regmap, LTDC_SRCR, SRCR_VBR);

if (event) {
crtc->state->event = NULL;
@@ -784,10 +772,14 @@ static bool ltdc_crtc_get_scanout_position(struct drm_crtc *crtc,
* simplify the code and only test if line > vactive_end
*/
if (pm_runtime_active(ddev->dev)) {
- line = reg_read(ldev->regs, LTDC_CPSR) & CPSR_CYPOS;
- vactive_start = reg_read(ldev->regs, LTDC_BPCR) & BPCR_AVBP;
- vactive_end = reg_read(ldev->regs, LTDC_AWCR) & AWCR_AAH;
- vtotal = reg_read(ldev->regs, LTDC_TWCR) & TWCR_TOTALH;
+ regmap_read(ldev->regmap, LTDC_CPSR, &line);
+ line &= CPSR_CYPOS;
+ regmap_read(ldev->regmap, LTDC_BPCR, &vactive_start);
+ vactive_start &= BPCR_AVBP;
+ regmap_read(ldev->regmap, LTDC_AWCR, &vactive_end);
+ vactive_end &= AWCR_AAH;
+ regmap_read(ldev->regmap, LTDC_TWCR, &vtotal);
+ vtotal &= TWCR_TOTALH;

if (line > vactive_end)
*vpos = line - vtotal - vactive_start;
@@ -823,7 +815,7 @@ static int ltdc_crtc_enable_vblank(struct drm_crtc *crtc)
DRM_DEBUG_DRIVER("\n");

if (state->enable)
- reg_set(ldev->regs, LTDC_IER, IER_LIE);
+ regmap_set_bits(ldev->regmap, LTDC_IER, IER_LIE);
else
return -EPERM;

@@ -835,7 +827,7 @@ static void ltdc_crtc_disable_vblank(struct drm_crtc *crtc)
struct ltdc_device *ldev = crtc_to_ltdc(crtc);

DRM_DEBUG_DRIVER("\n");
- reg_clear(ldev->regs, LTDC_IER, IER_LIE);
+ regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE);
}

static const struct drm_crtc_funcs ltdc_crtc_funcs = {
@@ -913,19 +905,20 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
newstate->crtc_w, newstate->crtc_h,
newstate->crtc_x, newstate->crtc_y);

- bpcr = reg_read(ldev->regs, LTDC_BPCR);
+ regmap_read(ldev->regmap, LTDC_BPCR, &bpcr);
+
ahbp = (bpcr & BPCR_AHBP) >> 16;
avbp = bpcr & BPCR_AVBP;

/* Configures the horizontal start and stop position */
val = ((x1 + 1 + ahbp) << 16) + (x0 + 1 + ahbp);
- reg_update_bits(ldev->regs, LTDC_L1WHPCR + lofs,
- LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1WHPCR + lofs,
+ LXWHPCR_WHSTPOS | LXWHPCR_WHSPPOS, val);

/* Configures the vertical start and stop position */
val = ((y1 + 1 + avbp) << 16) + (y0 + 1 + avbp);
- reg_update_bits(ldev->regs, LTDC_L1WVPCR + lofs,
- LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1WVPCR + lofs,
+ LXWVPCR_WVSTPOS | LXWVPCR_WVSPPOS, val);

/* Specifies the pixel format */
pf = to_ltdc_pixelformat(fb->format->format);
@@ -938,19 +931,18 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
(char *)&fb->format->format);
val = 0; /* set by default ARGB 32 bits */
}
- reg_update_bits(ldev->regs, LTDC_L1PFCR + lofs, LXPFCR_PF, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1PFCR + lofs, LXPFCR_PF, val);

/* Configures the color frame buffer pitch in bytes & line length */
pitch_in_bytes = fb->pitches[0];
line_length = fb->format->cpp[0] *
(x1 - x0 + 1) + (ldev->caps.bus_width >> 3) - 1;
val = ((pitch_in_bytes << 16) | line_length);
- reg_update_bits(ldev->regs, LTDC_L1CFBLR + lofs,
- LXCFBLR_CFBLL | LXCFBLR_CFBP, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1CFBLR + lofs, LXCFBLR_CFBLL | LXCFBLR_CFBP, val);

/* Specifies the constant alpha value */
val = newstate->alpha >> 8;
- reg_update_bits(ldev->regs, LTDC_L1CACR + lofs, LXCACR_CONSTA, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1CACR + lofs, LXCACR_CONSTA, val);

/* Specifies the blending factors */
val = BF1_PAXCA | BF2_1PAXCA;
@@ -962,24 +954,22 @@ static void ltdc_plane_atomic_update(struct drm_plane *plane,
plane->type != DRM_PLANE_TYPE_PRIMARY)
val = BF1_PAXCA | BF2_1PAXCA;

- reg_update_bits(ldev->regs, LTDC_L1BFCR + lofs,
- LXBFCR_BF2 | LXBFCR_BF1, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1BFCR + lofs, LXBFCR_BF2 | LXBFCR_BF1, val);

/* Configures the frame buffer line number */
val = y1 - y0 + 1;
- reg_update_bits(ldev->regs, LTDC_L1CFBLNR + lofs, LXCFBLNR_CFBLN, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1CFBLNR + lofs, LXCFBLNR_CFBLN, val);

/* Sets the FB address */
paddr = (u32)drm_fb_cma_get_gem_addr(fb, newstate, 0);

DRM_DEBUG_DRIVER("fb: phys 0x%08x", paddr);
- reg_write(ldev->regs, LTDC_L1CFBAR + lofs, paddr);
+ regmap_write(ldev->regmap, LTDC_L1CFBAR + lofs, paddr);

/* Enable layer and CLUT if needed */
val = fb->format->format == DRM_FORMAT_C8 ? LXCR_CLUTEN : 0;
val |= LXCR_LEN;
- reg_update_bits(ldev->regs, LTDC_L1CR + lofs,
- LXCR_LEN | LXCR_CLUTEN, val);
+ regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_LEN | LXCR_CLUTEN, val);

ldev->plane_fpsi[plane->index].counter++;

@@ -1004,7 +994,7 @@ static void ltdc_plane_atomic_disable(struct drm_plane *plane,
u32 lofs = plane->index * LAY_OFS;

/* disable layer */
- reg_clear(ldev->regs, LTDC_L1CR + lofs, LXCR_LEN);
+ regmap_write_bits(ldev->regmap, LTDC_L1CR + lofs, LXCR_LEN, 0);

DRM_DEBUG_DRIVER("CRTC:%d plane:%d\n",
oldstate->crtc->base.id, plane->base.id);
@@ -1172,7 +1162,7 @@ static void ltdc_encoder_disable(struct drm_encoder *encoder)
DRM_DEBUG_DRIVER("\n");

/* Disable LTDC */
- reg_clear(ldev->regs, LTDC_GCR, GCR_LTDCEN);
+ regmap_clear_bits(ldev->regmap, LTDC_GCR, GCR_LTDCEN);

/* Set to sleep state the pinctrl whatever type of encoder */
pinctrl_pm_select_sleep_state(ddev->dev);
@@ -1186,7 +1176,7 @@ static void ltdc_encoder_enable(struct drm_encoder *encoder)
DRM_DEBUG_DRIVER("\n");

/* Enable LTDC */
- reg_set(ldev->regs, LTDC_GCR, GCR_LTDCEN);
+ regmap_set_bits(ldev->regmap, LTDC_GCR, GCR_LTDCEN);
}

static void ltdc_encoder_mode_set(struct drm_encoder *encoder,
@@ -1249,15 +1239,15 @@ static int ltdc_get_caps(struct drm_device *ddev)
* at least 1 layer must be managed & the number of layers
* must not exceed LTDC_MAX_LAYER
*/
- lcr = reg_read(ldev->regs, LTDC_LCR);
+ regmap_read(ldev->regmap, LTDC_LCR, &lcr);

ldev->caps.nb_layers = clamp((int)lcr, 1, LTDC_MAX_LAYER);

/* set data bus width */
- gc2r = reg_read(ldev->regs, LTDC_GC2R);
+ regmap_read(ldev->regmap, LTDC_GC2R, &gc2r);
bus_width_log2 = (gc2r & GC2R_BW) >> 4;
ldev->caps.bus_width = 8 << bus_width_log2;
- ldev->caps.hw_version = reg_read(ldev->regs, LTDC_IDR);
+ regmap_read(ldev->regmap, LTDC_IDR, &ldev->caps.hw_version);

switch (ldev->caps.hw_version) {
case HWVER_10200:
@@ -1410,9 +1400,15 @@ int ltdc_load(struct drm_device *ddev)
goto err;
}

+ ldev->regmap = devm_regmap_init_mmio(&pdev->dev, ldev->regs, &stm32_ltdc_regmap_cfg);
+ if (IS_ERR(ldev->regmap)) {
+ DRM_ERROR("Unable to regmap ltdc registers\n");
+ ret = PTR_ERR(ldev->regmap);
+ goto err;
+ }
+
/* Disable interrupts */
- reg_clear(ldev->regs, LTDC_IER,
- IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);
+ regmap_clear_bits(ldev->regmap, LTDC_IER, IER_LIE | IER_RRIE | IER_FUIE | IER_TERRIE);

ret = ltdc_get_caps(ddev);
if (ret) {
diff --git a/drivers/gpu/drm/stm/ltdc.h b/drivers/gpu/drm/stm/ltdc.h
index 55a125f89af6..20b3dcc7817b 100644
--- a/drivers/gpu/drm/stm/ltdc.h
+++ b/drivers/gpu/drm/stm/ltdc.h
@@ -32,6 +32,7 @@ struct fps_info {

struct ltdc_device {
void __iomem *regs;
+ struct regmap *regmap;
struct clk *pixel_clk; /* lcd pixel clock */
struct mutex err_lock; /* protecting error_status */
struct ltdc_caps caps;
--
2.17.1
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