On OMAP5 it is not possible to use TILER buffer with CPU when caching or
write-combining is used. Doing so leads to errors from the memory
manager.
However, on OMAP4, write-combining works fine.
This patch adds platform specific data for the TILER, and a function
tiler_get_cpu_cache_flags() which can be used to get the caching mode to
be used.
Note that without write-combining the use of the TILER buffer with CPU
is unusably slow. It's still good to have it operational for testing
purposes.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@xxxxxx>
---
drivers/gpu/drm/omapdrm/omap_dmm_priv.h | 6 +++++
drivers/gpu/drm/omapdrm/omap_dmm_tiler.c | 39 ++++++++++++++++++++++++++++++--
drivers/gpu/drm/omapdrm/omap_dmm_tiler.h | 1 +
drivers/gpu/drm/omapdrm/omap_gem.c | 4 ++--
4 files changed, 46 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_priv.h b/drivers/gpu/drm/omapdrm/omap_dmm_priv.h
index 58bcd6ae0255..d96660573076 100644
--- a/drivers/gpu/drm/omapdrm/omap_dmm_priv.h
+++ b/drivers/gpu/drm/omapdrm/omap_dmm_priv.h
@@ -153,6 +153,10 @@ struct refill_engine {
struct list_head idle_node;
};
+struct dmm_platform_data {
+ uint32_t cpu_cache_flags;
+};
+
struct dmm {
struct device *dev;
void __iomem *base;
@@ -183,6 +187,8 @@ struct dmm {
/* allocation list and lock */
struct list_head alloc_head;
+
+ const struct dmm_platform_data *plat_data;
};
#endif
diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
index 56c60552abba..ef3d14d9cfa1 100644
--- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
+++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
@@ -39,6 +39,10 @@
static struct tcm *containers[TILFMT_NFORMATS];
static struct dmm *omap_dmm;
+#if defined(CONFIG_OF)
+static const struct of_device_id dmm_of_match[];
+#endif
+
/* global spinlock for protecting lists */
static DEFINE_SPINLOCK(list_lock);
@@ -529,6 +533,11 @@ size_t tiler_vsize(enum tiler_fmt fmt, uint16_t w, uint16_t h)
return round_up(geom[fmt].cpp * w, PAGE_SIZE) * h;
}
+uint32_t tiler_get_cpu_cache_flags(void)
+{
+ return omap_dmm->plat_data->cpu_cache_flags;
+}
+
bool dmm_is_available(void)
{
return omap_dmm ? true : false;
@@ -592,6 +601,18 @@ static int omap_dmm_probe(struct platform_device *dev)
init_waitqueue_head(&omap_dmm->engine_queue);
+ if (dev->dev.of_node) {
+ const struct of_device_id *match;
+
+ match = of_match_node(dmm_of_match, dev->dev.of_node);
+ if (!match) {
+ dev_err(&dev->dev, "failed to find matching device node\n");
+ return -ENODEV;
+ }
+
+ omap_dmm->plat_data = match->data;
+ }
+
/* lookup hwmod data - base address and irq */
mem = platform_get_resource(dev, IORESOURCE_MEM, 0);
if (!mem) {
@@ -972,9 +993,23 @@ static const struct dev_pm_ops omap_dmm_pm_ops = {
#endif
#if defined(CONFIG_OF)
+static const struct dmm_platform_data dmm_omap4_platform_data = {
+ .cpu_cache_flags = OMAP_BO_WC,
+};
+
+static const struct dmm_platform_data dmm_omap5_platform_data = {
+ .cpu_cache_flags = OMAP_BO_UNCACHED,
+};
+
static const struct of_device_id dmm_of_match[] = {
- { .compatible = "ti,omap4-dmm", },
- { .compatible = "ti,omap5-dmm", },
+ {
+ .compatible = "ti,omap4-dmm",
+ .data = &dmm_omap4_platform_data,
+ },
+ {
+ .compatible = "ti,omap5-dmm",
+ .data = &dmm_omap5_platform_data,
+ },
{},
};
#endif
diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.h b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.h
index 4fdd61e54bd2..e83c78372db8 100644
--- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.h
+++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.h
@@ -106,6 +106,7 @@ uint32_t tiler_stride(enum tiler_fmt fmt, uint32_t orient);
size_t tiler_size(enum tiler_fmt fmt, uint16_t w, uint16_t h);
size_t tiler_vsize(enum tiler_fmt fmt, uint16_t w, uint16_t h);
void tiler_align(enum tiler_fmt fmt, uint16_t *w, uint16_t *h);
+uint32_t tiler_get_cpu_cache_flags(void);
bool dmm_is_available(void);
extern struct platform_driver omap_dmm_driver;
diff --git a/drivers/gpu/drm/omapdrm/omap_gem.c b/drivers/gpu/drm/omapdrm/omap_gem.c
index 9b250c93b046..d37ee756a0b1 100644
--- a/drivers/gpu/drm/omapdrm/omap_gem.c
+++ b/drivers/gpu/drm/omapdrm/omap_gem.c
@@ -1359,8 +1359,8 @@ struct drm_gem_object *omap_gem_new(struct drm_device *dev,
/* currently don't allow cached buffers.. there is some caching
* stuff that needs to be handled better
*/
- flags &= ~(OMAP_BO_CACHED|OMAP_BO_UNCACHED);
- flags |= OMAP_BO_WC;
+ flags &= ~(OMAP_BO_CACHED|OMAP_BO_WC|OMAP_BO_UNCACHED);
+ flags |= tiler_get_cpu_cache_flags();
/* align dimensions to slot boundaries... */
tiler_align(gem2fmt(flags),
--
2.3.0
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