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path: root/drivers/gpu/drm/radeon/radeon_i2c.c
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Diffstat (limited to 'drivers/gpu/drm/radeon/radeon_i2c.c')
-rw-r--r--drivers/gpu/drm/radeon/radeon_i2c.c397
1 files changed, 267 insertions, 130 deletions
diff --git a/drivers/gpu/drm/radeon/radeon_i2c.c b/drivers/gpu/drm/radeon/radeon_i2c.c
index 4ae50c19589..add62200840 100644
--- a/drivers/gpu/drm/radeon/radeon_i2c.c
+++ b/drivers/gpu/drm/radeon/radeon_i2c.c
@@ -23,49 +23,79 @@
* Authors: Dave Airlie
* Alex Deucher
*/
-#include "drmP.h"
-#include "radeon_drm.h"
+#include <linux/export.h>
+
+#include <drm/drmP.h>
+#include <drm/drm_edid.h>
+#include <drm/radeon_drm.h>
#include "radeon.h"
#include "atom.h"
+extern int radeon_atom_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
+ struct i2c_msg *msgs, int num);
+extern u32 radeon_atom_hw_i2c_func(struct i2c_adapter *adap);
+
/**
* radeon_ddc_probe
*
*/
-bool radeon_ddc_probe(struct radeon_connector *radeon_connector)
+bool radeon_ddc_probe(struct radeon_connector *radeon_connector, bool use_aux)
{
- u8 out_buf[] = { 0x0, 0x0};
- u8 buf[2];
+ u8 out = 0x0;
+ u8 buf[8];
int ret;
struct i2c_msg msgs[] = {
{
- .addr = 0x50,
+ .addr = DDC_ADDR,
.flags = 0,
.len = 1,
- .buf = out_buf,
+ .buf = &out,
},
{
- .addr = 0x50,
+ .addr = DDC_ADDR,
.flags = I2C_M_RD,
- .len = 1,
+ .len = 8,
.buf = buf,
}
};
- ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
- if (ret == 2)
- return true;
+ /* on hw with routers, select right port */
+ if (radeon_connector->router.ddc_valid)
+ radeon_router_select_ddc_port(radeon_connector);
+
+ if (use_aux) {
+ ret = i2c_transfer(&radeon_connector->ddc_bus->aux.ddc, msgs, 2);
+ } else {
+ ret = i2c_transfer(&radeon_connector->ddc_bus->adapter, msgs, 2);
+ }
- return false;
+ if (ret != 2)
+ /* Couldn't find an accessible DDC on this connector */
+ return false;
+ /* Probe also for valid EDID header
+ * EDID header starts with:
+ * 0x00,0xFF,0xFF,0xFF,0xFF,0xFF,0xFF,0x00.
+ * Only the first 6 bytes must be valid as
+ * drm_edid_block_valid() can fix the last 2 bytes */
+ if (drm_edid_header_is_valid(buf) < 6) {
+ /* Couldn't find an accessible EDID on this
+ * connector */
+ return false;
+ }
+ return true;
}
+/* bit banging i2c */
-static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
+static int pre_xfer(struct i2c_adapter *i2c_adap)
{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
uint32_t temp;
+ mutex_lock(&i2c->mutex);
+
/* RV410 appears to have a bug where the hw i2c in reset
* holds the i2c port in a bad state - switch hw i2c away before
* doing DDC - do this for all r200s/r300s/r400s for safety sake
@@ -94,6 +124,13 @@ static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
}
}
+ /* switch the pads to ddc mode */
+ if (ASIC_IS_DCE3(rdev) && rec->hw_capable) {
+ temp = RREG32(rec->mask_clk_reg);
+ temp &= ~(1 << 16);
+ WREG32(rec->mask_clk_reg, temp);
+ }
+
/* clear the output pin values */
temp = RREG32(rec->a_clk_reg) & ~rec->a_clk_mask;
WREG32(rec->a_clk_reg, temp);
@@ -109,21 +146,34 @@ static void radeon_i2c_do_lock(struct radeon_i2c_chan *i2c, int lock_state)
WREG32(rec->en_data_reg, temp);
/* mask the gpio pins for software use */
- temp = RREG32(rec->mask_clk_reg);
- if (lock_state)
- temp |= rec->mask_clk_mask;
- else
- temp &= ~rec->mask_clk_mask;
+ temp = RREG32(rec->mask_clk_reg) | rec->mask_clk_mask;
WREG32(rec->mask_clk_reg, temp);
temp = RREG32(rec->mask_clk_reg);
+ temp = RREG32(rec->mask_data_reg) | rec->mask_data_mask;
+ WREG32(rec->mask_data_reg, temp);
temp = RREG32(rec->mask_data_reg);
- if (lock_state)
- temp |= rec->mask_data_mask;
- else
- temp &= ~rec->mask_data_mask;
+
+ return 0;
+}
+
+static void post_xfer(struct i2c_adapter *i2c_adap)
+{
+ struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
+ struct radeon_device *rdev = i2c->dev->dev_private;
+ struct radeon_i2c_bus_rec *rec = &i2c->rec;
+ uint32_t temp;
+
+ /* unmask the gpio pins for software use */
+ temp = RREG32(rec->mask_clk_reg) & ~rec->mask_clk_mask;
+ WREG32(rec->mask_clk_reg, temp);
+ temp = RREG32(rec->mask_clk_reg);
+
+ temp = RREG32(rec->mask_data_reg) & ~rec->mask_data_mask;
WREG32(rec->mask_data_reg, temp);
temp = RREG32(rec->mask_data_reg);
+
+ mutex_unlock(&i2c->mutex);
}
static int get_clock(void *i2c_priv)
@@ -181,13 +231,14 @@ static void set_data(void *i2c_priv, int data)
WREG32(rec->en_data_reg, val);
}
+/* hw i2c */
+
static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
{
- struct radeon_pll *spll = &rdev->clock.spll;
- u32 sclk = radeon_get_engine_clock(rdev);
+ u32 sclk = rdev->pm.current_sclk;
u32 prescale = 0;
- u32 n, m;
- u8 loop;
+ u32 nm;
+ u8 n, m, loop;
int i2c_clock;
switch (rdev->family) {
@@ -203,13 +254,15 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
case CHIP_R300:
case CHIP_R350:
case CHIP_RV350:
- n = (spll->reference_freq) / (4 * 6);
+ i2c_clock = 60;
+ nm = (sclk * 10) / (i2c_clock * 4);
for (loop = 1; loop < 255; loop++) {
- if ((loop * (loop - 1)) > n)
+ if ((nm / loop) < loop)
break;
}
- m = loop - 1;
- prescale = m | (loop << 8);
+ n = loop - 1;
+ m = loop - 2;
+ prescale = m | (n << 8);
break;
case CHIP_RV380:
case CHIP_RS400:
@@ -217,7 +270,6 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
case CHIP_R420:
case CHIP_R423:
case CHIP_RV410:
- sclk = radeon_get_engine_clock(rdev);
prescale = (((sclk * 10)/(4 * 128 * 100) + 1) << 8) + 128;
break;
case CHIP_RS600:
@@ -232,7 +284,6 @@ static u32 radeon_get_i2c_prescale(struct radeon_device *rdev)
case CHIP_RV570:
case CHIP_R580:
i2c_clock = 50;
- sclk = radeon_get_engine_clock(rdev);
if (rdev->family == CHIP_R520)
prescale = (127 << 8) + ((sclk * 10) / (4 * 127 * i2c_clock));
else
@@ -291,6 +342,7 @@ static int r100_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
prescale = radeon_get_i2c_prescale(rdev);
reg = ((prescale << RADEON_I2C_PRESCALE_SHIFT) |
+ RADEON_I2C_DRIVE_EN |
RADEON_I2C_START |
RADEON_I2C_STOP |
RADEON_I2C_GO);
@@ -757,26 +809,15 @@ done:
return ret;
}
-static int radeon_sw_i2c_xfer(struct i2c_adapter *i2c_adap,
+static int radeon_hw_i2c_xfer(struct i2c_adapter *i2c_adap,
struct i2c_msg *msgs, int num)
{
struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
- int ret;
-
- radeon_i2c_do_lock(i2c, 1);
- ret = i2c_transfer(&i2c->algo.radeon.bit_adapter, msgs, num);
- radeon_i2c_do_lock(i2c, 0);
-
- return ret;
-}
-
-static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
- struct i2c_msg *msgs, int num)
-{
- struct radeon_i2c_chan *i2c = i2c_get_adapdata(i2c_adap);
struct radeon_device *rdev = i2c->dev->dev_private;
struct radeon_i2c_bus_rec *rec = &i2c->rec;
- int ret;
+ int ret = 0;
+
+ mutex_lock(&i2c->mutex);
switch (rdev->family) {
case CHIP_R100:
@@ -797,16 +838,12 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_RV410:
case CHIP_RS400:
case CHIP_RS480:
- if (rec->hw_capable)
- ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
- else
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
+ ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_RS600:
case CHIP_RS690:
case CHIP_RS740:
/* XXX fill in hw i2c implementation */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_RV515:
case CHIP_R520:
@@ -814,20 +851,16 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_RV560:
case CHIP_RV570:
case CHIP_R580:
- if (rec->hw_capable) {
- if (rec->mm_i2c)
- ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
- else
- ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
- } else
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
+ if (rec->mm_i2c)
+ ret = r100_hw_i2c_xfer(i2c_adap, msgs, num);
+ else
+ ret = r500_hw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_R600:
case CHIP_RV610:
case CHIP_RV630:
case CHIP_RV670:
/* XXX fill in hw i2c implementation */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_RV620:
case CHIP_RV635:
@@ -838,7 +871,6 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_RV710:
case CHIP_RV740:
/* XXX fill in hw i2c implementation */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
case CHIP_CEDAR:
case CHIP_REDWOOD:
@@ -846,7 +878,6 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
case CHIP_CYPRESS:
case CHIP_HEMLOCK:
/* XXX fill in hw i2c implementation */
- ret = radeon_sw_i2c_xfer(i2c_adap, msgs, num);
break;
default:
DRM_ERROR("i2c: unhandled radeon chip\n");
@@ -854,92 +885,94 @@ static int radeon_i2c_xfer(struct i2c_adapter *i2c_adap,
break;
}
+ mutex_unlock(&i2c->mutex);
+
return ret;
}
-static u32 radeon_i2c_func(struct i2c_adapter *adap)
+static u32 radeon_hw_i2c_func(struct i2c_adapter *adap)
{
return I2C_FUNC_I2C | I2C_FUNC_SMBUS_EMUL;
}
static const struct i2c_algorithm radeon_i2c_algo = {
- .master_xfer = radeon_i2c_xfer,
- .functionality = radeon_i2c_func,
+ .master_xfer = radeon_hw_i2c_xfer,
+ .functionality = radeon_hw_i2c_func,
+};
+
+static const struct i2c_algorithm radeon_atom_i2c_algo = {
+ .master_xfer = radeon_atom_hw_i2c_xfer,
+ .functionality = radeon_atom_hw_i2c_func,
};
struct radeon_i2c_chan *radeon_i2c_create(struct drm_device *dev,
struct radeon_i2c_bus_rec *rec,
const char *name)
{
+ struct radeon_device *rdev = dev->dev_private;
struct radeon_i2c_chan *i2c;
int ret;
- i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
- if (i2c == NULL)
+ /* don't add the mm_i2c bus unless hw_i2c is enabled */
+ if (rec->mm_i2c && (radeon_hw_i2c == 0))
return NULL;
- /* set the internal bit adapter */
- i2c->algo.radeon.bit_adapter.owner = THIS_MODULE;
- i2c_set_adapdata(&i2c->algo.radeon.bit_adapter, i2c);
- sprintf(i2c->algo.radeon.bit_adapter.name, "Radeon internal i2c bit bus %s", name);
- i2c->algo.radeon.bit_adapter.algo_data = &i2c->algo.radeon.bit_data;
- i2c->algo.radeon.bit_data.setsda = set_data;
- i2c->algo.radeon.bit_data.setscl = set_clock;
- i2c->algo.radeon.bit_data.getsda = get_data;
- i2c->algo.radeon.bit_data.getscl = get_clock;
- i2c->algo.radeon.bit_data.udelay = 20;
- /* vesa says 2.2 ms is enough, 1 jiffy doesn't seem to always
- * make this, 2 jiffies is a lot more reliable */
- i2c->algo.radeon.bit_data.timeout = 2;
- i2c->algo.radeon.bit_data.data = i2c;
- ret = i2c_bit_add_bus(&i2c->algo.radeon.bit_adapter);
- if (ret) {
- DRM_ERROR("Failed to register internal bit i2c %s\n", name);
- goto out_free;
- }
- /* set the radeon i2c adapter */
- i2c->dev = dev;
- i2c->rec = *rec;
- i2c->adapter.owner = THIS_MODULE;
- i2c_set_adapdata(&i2c->adapter, i2c);
- sprintf(i2c->adapter.name, "Radeon i2c %s", name);
- i2c->adapter.algo_data = &i2c->algo.radeon;
- i2c->adapter.algo = &radeon_i2c_algo;
- ret = i2c_add_adapter(&i2c->adapter);
- if (ret) {
- DRM_ERROR("Failed to register i2c %s\n", name);
- goto out_free;
- }
-
- return i2c;
-out_free:
- kfree(i2c);
- return NULL;
-
-}
-
-struct radeon_i2c_chan *radeon_i2c_create_dp(struct drm_device *dev,
- struct radeon_i2c_bus_rec *rec,
- const char *name)
-{
- struct radeon_i2c_chan *i2c;
- int ret;
-
i2c = kzalloc(sizeof(struct radeon_i2c_chan), GFP_KERNEL);
if (i2c == NULL)
return NULL;
i2c->rec = *rec;
i2c->adapter.owner = THIS_MODULE;
+ i2c->adapter.class = I2C_CLASS_DDC;
+ i2c->adapter.dev.parent = &dev->pdev->dev;
i2c->dev = dev;
i2c_set_adapdata(&i2c->adapter, i2c);
- i2c->adapter.algo_data = &i2c->algo.dp;
- i2c->algo.dp.aux_ch = radeon_dp_i2c_aux_ch;
- i2c->algo.dp.address = 0;
- ret = i2c_dp_aux_add_bus(&i2c->adapter);
- if (ret) {
- DRM_INFO("Failed to register i2c %s\n", name);
- goto out_free;
+ mutex_init(&i2c->mutex);
+ if (rec->mm_i2c ||
+ (rec->hw_capable &&
+ radeon_hw_i2c &&
+ ((rdev->family <= CHIP_RS480) ||
+ ((rdev->family >= CHIP_RV515) && (rdev->family <= CHIP_R580))))) {
+ /* set the radeon hw i2c adapter */
+ snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
+ "Radeon i2c hw bus %s", name);
+ i2c->adapter.algo = &radeon_i2c_algo;
+ ret = i2c_add_adapter(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register hw i2c %s\n", name);
+ goto out_free;
+ }
+ } else if (rec->hw_capable &&
+ radeon_hw_i2c &&
+ ASIC_IS_DCE3(rdev)) {
+ /* hw i2c using atom */
+ snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
+ "Radeon i2c hw bus %s", name);
+ i2c->adapter.algo = &radeon_atom_i2c_algo;
+ ret = i2c_add_adapter(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register hw i2c %s\n", name);
+ goto out_free;
+ }
+ } else {
+ /* set the radeon bit adapter */
+ snprintf(i2c->adapter.name, sizeof(i2c->adapter.name),
+ "Radeon i2c bit bus %s", name);
+ i2c->adapter.algo_data = &i2c->bit;
+ i2c->bit.pre_xfer = pre_xfer;
+ i2c->bit.post_xfer = post_xfer;
+ i2c->bit.setsda = set_data;
+ i2c->bit.setscl = set_clock;
+ i2c->bit.getsda = get_data;
+ i2c->bit.getscl = get_clock;
+ i2c->bit.udelay = 10;
+ i2c->bit.timeout = usecs_to_jiffies(2200); /* from VESA */
+ i2c->bit.data = i2c;
+ ret = i2c_bit_add_bus(&i2c->adapter);
+ if (ret) {
+ DRM_ERROR("Failed to register bit i2c %s\n", name);
+ goto out_free;
+ }
}
return i2c;
@@ -953,18 +986,66 @@ void radeon_i2c_destroy(struct radeon_i2c_chan *i2c)
{
if (!i2c)
return;
- i2c_del_adapter(&i2c->algo.radeon.bit_adapter);
i2c_del_adapter(&i2c->adapter);
+ if (i2c->has_aux)
+ drm_dp_aux_unregister(&i2c->aux);
kfree(i2c);
}
-void radeon_i2c_destroy_dp(struct radeon_i2c_chan *i2c)
+/* Add the default buses */
+void radeon_i2c_init(struct radeon_device *rdev)
{
- if (!i2c)
- return;
+ if (radeon_hw_i2c)
+ DRM_INFO("hw_i2c forced on, you may experience display detection problems!\n");
- i2c_del_adapter(&i2c->adapter);
- kfree(i2c);
+ if (rdev->is_atom_bios)
+ radeon_atombios_i2c_init(rdev);
+ else
+ radeon_combios_i2c_init(rdev);
+}
+
+/* remove all the buses */
+void radeon_i2c_fini(struct radeon_device *rdev)
+{
+ int i;
+
+ for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
+ if (rdev->i2c_bus[i]) {
+ radeon_i2c_destroy(rdev->i2c_bus[i]);
+ rdev->i2c_bus[i] = NULL;
+ }
+ }
+}
+
+/* Add additional buses */
+void radeon_i2c_add(struct radeon_device *rdev,
+ struct radeon_i2c_bus_rec *rec,
+ const char *name)
+{
+ struct drm_device *dev = rdev->ddev;
+ int i;
+
+ for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
+ if (!rdev->i2c_bus[i]) {
+ rdev->i2c_bus[i] = radeon_i2c_create(dev, rec, name);
+ return;
+ }
+ }
+}
+
+/* looks up bus based on id */
+struct radeon_i2c_chan *radeon_i2c_lookup(struct radeon_device *rdev,
+ struct radeon_i2c_bus_rec *i2c_bus)
+{
+ int i;
+
+ for (i = 0; i < RADEON_MAX_I2C_BUS; i++) {
+ if (rdev->i2c_bus[i] &&
+ (rdev->i2c_bus[i]->rec.i2c_id == i2c_bus->i2c_id)) {
+ return rdev->i2c_bus[i];
+ }
+ }
+ return NULL;
}
struct drm_encoder *radeon_best_encoder(struct drm_connector *connector)
@@ -1001,7 +1082,7 @@ void radeon_i2c_get_byte(struct radeon_i2c_chan *i2c_bus,
*val = in_buf[0];
DRM_DEBUG("val = 0x%02x\n", *val);
} else {
- DRM_ERROR("i2c 0x%02x 0x%02x read failed\n",
+ DRM_DEBUG("i2c 0x%02x 0x%02x read failed\n",
addr, *val);
}
}
@@ -1023,7 +1104,63 @@ void radeon_i2c_put_byte(struct radeon_i2c_chan *i2c_bus,
out_buf[1] = val;
if (i2c_transfer(&i2c_bus->adapter, &msg, 1) != 1)
- DRM_ERROR("i2c 0x%02x 0x%02x write failed\n",
+ DRM_DEBUG("i2c 0x%02x 0x%02x write failed\n",
addr, val);
}
+/* ddc router switching */
+void radeon_router_select_ddc_port(struct radeon_connector *radeon_connector)
+{
+ u8 val;
+
+ if (!radeon_connector->router.ddc_valid)
+ return;
+
+ if (!radeon_connector->router_bus)
+ return;
+
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, &val);
+ val &= ~radeon_connector->router.ddc_mux_control_pin;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, val);
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, &val);
+ val &= ~radeon_connector->router.ddc_mux_control_pin;
+ val |= radeon_connector->router.ddc_mux_state;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, val);
+}
+
+/* clock/data router switching */
+void radeon_router_select_cd_port(struct radeon_connector *radeon_connector)
+{
+ u8 val;
+
+ if (!radeon_connector->router.cd_valid)
+ return;
+
+ if (!radeon_connector->router_bus)
+ return;
+
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, &val);
+ val &= ~radeon_connector->router.cd_mux_control_pin;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x3, val);
+ radeon_i2c_get_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, &val);
+ val &= ~radeon_connector->router.cd_mux_control_pin;
+ val |= radeon_connector->router.cd_mux_state;
+ radeon_i2c_put_byte(radeon_connector->router_bus,
+ radeon_connector->router.i2c_addr,
+ 0x1, val);
+}
+
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2025-12-15 18:19:45 +0000