mirrors/linux-stable
1
0
Fork 0
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git synced 2024-09-29 22:02:02 +00:00
Code Issues Releases Wiki Activity

drm/stm: ltdc: switch to regmap

Browse source 
Replace the legacy register access by regmap API.

Signed-off-by: Yannick Fertre <yannick.fertre@foss.st.com>
Acked-by: Philippe Cornu <philippe.cornu@foss.st.com>
Reviewed-by: Philippe Cornu <philippe.cornu@foss.st.com>
Reviewed-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Tested-by: Raphael Gallais-Pou <raphael.gallais-pou@foss.st.com>
Signed-off-by: Philippe Cornu <philippe.cornu@foss.st.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20211215214738.19946-1-yannick.fertre@foss.st.com
This commit is contained in:
Yannick Fertre 2021-12-15 22:47:38 +01:00 committed by Philippe Cornu
parent 8f54eab0ef
commit 734c26450a
2 changed files with 68 additions and 71 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

138
drivers/gpu/drm/stm/ltdc.c
View file

@ -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) {

1
drivers/gpu/drm/stm/ltdc.h
View file

@ -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;