[PATCH 01/23] OMAPDSS: HDMI: lane config support
Tomi Valkeinen
tomi.valkeinen at ti.com
Thu Apr 24 03:16:57 PDT 2014
Add support to configure the pins used for the HDMI lanes. The order and
polarity of the lanes can be defined in the DT data.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>
---
drivers/video/fbdev/omap2/dss/hdmi.h | 6 ++
drivers/video/fbdev/omap2/dss/hdmi4.c | 28 +++++++++
drivers/video/fbdev/omap2/dss/hdmi_common.c | 41 +++++++++++++
drivers/video/fbdev/omap2/dss/hdmi_phy.c | 94 ++++++++++++++++++++++++++++-
4 files changed, 167 insertions(+), 2 deletions(-)
diff --git a/drivers/video/fbdev/omap2/dss/hdmi.h b/drivers/video/fbdev/omap2/dss/hdmi.h
index e25681ff5a70..4e5c44e7eeb3 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi.h
+++ b/drivers/video/fbdev/omap2/dss/hdmi.h
@@ -352,6 +352,9 @@ struct hdmi_phy_data {
void __iomem *base;
int irq;
+
+ u8 lane_function[4];
+ u8 lane_polarity[4];
};
struct hdmi_core_data {
@@ -422,11 +425,14 @@ int hdmi_phy_enable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp,
void hdmi_phy_disable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp);
void hdmi_phy_dump(struct hdmi_phy_data *phy, struct seq_file *s);
int hdmi_phy_init(struct platform_device *pdev, struct hdmi_phy_data *phy);
+int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes);
/* HDMI common funcs */
const struct hdmi_config *hdmi_default_timing(void);
const struct hdmi_config *hdmi_get_timings(int mode, int code);
struct hdmi_cm hdmi_get_code(struct omap_video_timings *timing);
+int hdmi_parse_lanes_of(struct platform_device *pdev, struct device_node *ep,
+ struct hdmi_phy_data *phy);
#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
int hdmi_compute_acr(u32 pclk, u32 sample_freq, u32 *n, u32 *cts);
diff --git a/drivers/video/fbdev/omap2/dss/hdmi4.c b/drivers/video/fbdev/omap2/dss/hdmi4.c
index f5f7944a1fd1..e15b89d49c28 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi4.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi4.c
@@ -600,6 +600,28 @@ static void __exit hdmi_uninit_output(struct platform_device *pdev)
omapdss_unregister_output(out);
}
+static int hdmi_probe_of(struct platform_device *pdev)
+{
+ struct device_node *node = pdev->dev.of_node;
+ struct device_node *ep;
+ int r;
+
+ ep = omapdss_of_get_first_endpoint(node);
+ if (!ep)
+ return 0;
+
+ r = hdmi_parse_lanes_of(pdev, ep, &hdmi.phy);
+ if (r)
+ goto err;
+
+ of_node_put(ep);
+ return 0;
+
+err:
+ of_node_put(ep);
+ return r;
+}
+
/* HDMI HW IP initialisation */
static int omapdss_hdmihw_probe(struct platform_device *pdev)
{
@@ -609,6 +631,12 @@ static int omapdss_hdmihw_probe(struct platform_device *pdev)
mutex_init(&hdmi.lock);
+ if (pdev->dev.of_node) {
+ r = hdmi_probe_of(pdev);
+ if (r)
+ return r;
+ }
+
r = hdmi_wp_init(pdev, &hdmi.wp);
if (r)
return r;
diff --git a/drivers/video/fbdev/omap2/dss/hdmi_common.c b/drivers/video/fbdev/omap2/dss/hdmi_common.c
index 0b12a3f62fe1..9a2c39cf297f 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi_common.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi_common.c
@@ -17,6 +17,7 @@
#include <linux/kernel.h>
#include <linux/err.h>
+#include <linux/of.h>
#include <video/omapdss.h>
#include "hdmi.h"
@@ -323,6 +324,46 @@ end:
return cm;
}
+int hdmi_parse_lanes_of(struct platform_device *pdev, struct device_node *ep,
+ struct hdmi_phy_data *phy)
+{
+ struct property *prop;
+ int r, len;
+
+ prop = of_find_property(ep, "lanes", &len);
+ if (prop) {
+ u32 lanes[8];
+
+ if (len / sizeof(u32) != ARRAY_SIZE(lanes)) {
+ dev_err(&pdev->dev, "bad number of lanes\n");
+ return -EINVAL;
+ }
+
+ r = of_property_read_u32_array(ep, "lanes", lanes,
+ ARRAY_SIZE(lanes));
+ if (r) {
+ dev_err(&pdev->dev, "failed to read lane data\n");
+ return r;
+ }
+
+ r = hdmi_phy_parse_lanes(phy, lanes);
+ if (r) {
+ dev_err(&pdev->dev, "failed to parse lane data\n");
+ return r;
+ }
+ } else {
+ static const u32 default_lanes[] = { 0, 1, 2, 3, 4, 5, 6, 7 };
+
+ r = hdmi_phy_parse_lanes(phy, default_lanes);
+ if (WARN_ON(r)) {
+ dev_err(&pdev->dev, "failed to parse lane data\n");
+ return r;
+ }
+ }
+
+ return 0;
+}
+
#if defined(CONFIG_OMAP4_DSS_HDMI_AUDIO)
int hdmi_compute_acr(u32 pclk, u32 sample_freq, u32 *n, u32 *cts)
{
diff --git a/drivers/video/fbdev/omap2/dss/hdmi_phy.c b/drivers/video/fbdev/omap2/dss/hdmi_phy.c
index dd376ce8da01..c1c65624fd5d 100644
--- a/drivers/video/fbdev/omap2/dss/hdmi_phy.c
+++ b/drivers/video/fbdev/omap2/dss/hdmi_phy.c
@@ -59,6 +59,97 @@ static irqreturn_t hdmi_irq_handler(int irq, void *data)
return IRQ_HANDLED;
}
+int hdmi_phy_parse_lanes(struct hdmi_phy_data *phy, const u32 *lanes)
+{
+ int i;
+
+ for (i = 0; i < 8; i += 2) {
+ u8 lane, pol;
+ int dx, dy;
+
+ dx = lanes[i];
+ dy = lanes[i + 1];
+
+ if (dx < 0 || dx >= 8)
+ return -EINVAL;
+
+ if (dy < 0 || dy >= 8)
+ return -EINVAL;
+
+ if (dx & 1) {
+ if (dy != dx - 1)
+ return -EINVAL;
+ pol = 1;
+ } else {
+ if (dy != dx + 1)
+ return -EINVAL;
+ pol = 0;
+ }
+
+ lane = dx / 2;
+
+ phy->lane_function[lane] = i / 2;
+ phy->lane_polarity[lane] = pol;
+ }
+
+ return 0;
+}
+
+static void hdmi_phy_configure_lanes(struct hdmi_phy_data *phy)
+{
+ static const u16 pad_cfg_list[] = {
+ 0x0123,
+ 0x0132,
+ 0x0312,
+ 0x0321,
+ 0x0231,
+ 0x0213,
+ 0x1023,
+ 0x1032,
+ 0x3012,
+ 0x3021,
+ 0x2031,
+ 0x2013,
+ 0x1203,
+ 0x1302,
+ 0x3102,
+ 0x3201,
+ 0x2301,
+ 0x2103,
+ 0x1230,
+ 0x1320,
+ 0x3120,
+ 0x3210,
+ 0x2310,
+ 0x2130,
+ };
+
+ u16 lane_cfg = 0;
+ int i;
+ unsigned lane_cfg_val;
+ u16 pol_val = 0;
+
+ for (i = 0; i < 4; ++i)
+ lane_cfg |= phy->lane_function[i] << ((3 - i) * 4);
+
+ pol_val |= phy->lane_polarity[0] << 0;
+ pol_val |= phy->lane_polarity[1] << 3;
+ pol_val |= phy->lane_polarity[2] << 2;
+ pol_val |= phy->lane_polarity[3] << 1;
+
+ for (i = 0; i < ARRAY_SIZE(pad_cfg_list); ++i)
+ if (pad_cfg_list[i] == lane_cfg)
+ break;
+
+ if (WARN_ON(i == ARRAY_SIZE(pad_cfg_list)))
+ i = 0;
+
+ lane_cfg_val = i;
+
+ REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, lane_cfg_val, 26, 22);
+ REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, pol_val, 30, 27);
+}
+
int hdmi_phy_enable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp,
struct hdmi_config *cfg)
{
@@ -92,8 +183,7 @@ int hdmi_phy_enable(struct hdmi_phy_data *phy, struct hdmi_wp_data *wp,
/* Setup max LDO voltage */
REG_FLD_MOD(phy->base, HDMI_TXPHY_POWER_CTRL, 0xB, 3, 0);
- /* Write to phy address 3 to change the polarity control */
- REG_FLD_MOD(phy->base, HDMI_TXPHY_PAD_CFG_CTRL, 0x1, 27, 27);
+ hdmi_phy_configure_lanes(phy);
r = request_threaded_irq(phy->irq, NULL, hdmi_irq_handler,
IRQF_ONESHOT, "OMAP HDMI", wp);
--
1.9.1
More information about the linux-arm-kernel
mailing list