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OMAP: DSS2: Functions to request/release DSI VCs 

Introduce functions which request and release VC's. This will be used in panel
drivers in their probes.

omap_dsi_request_vc() takes in the pointer to the omap_dss_device, the VC_ID
parameter which goes into the header of the DSI packets, and returns a Virtual
channel number (or virtual channel register set) which it can use.

omap_dsi_set_vc_id() takes the omap_dss_device pointer, the Virtual Channel
number and the VC_ID that needs to be set for the specifed Virtual Channel.

omap_dsi_release_vc() takes the omap_dss_device pointer and the Virtual Channel
number that needs to be made free.

Initialisation of VC parameters is done in dsi_init().

Signed-off-by: Archit Taneja <archit@ti.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ti.com>
This commit is contained in:
Archit Taneja 2011-03-02 12:35:53 +05:30 committed by Tomi Valkeinen
parent 0a58351854
commit 5ee3c1445d
2 changed files with 65 additions and 5 deletions
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3
arch/arm/plat-omap/include/plat/display.h
View File

@ -562,6 +562,9 @@ int omap_dsi_update(struct omap_dss_device *dssdev,
int channel,
u16 x, u16 y, u16 w, u16 h,
void (*callback)(int, void *), void *data);
int omap_dsi_request_vc(struct omap_dss_device *dssdev, int *channel);
int omap_dsi_set_vc_id(struct omap_dss_device *dssdev, int channel, int vc_id);
void omap_dsi_release_vc(struct omap_dss_device *dssdev, int channel);
int omapdss_dsi_display_enable(struct omap_dss_device *dssdev);
void omapdss_dsi_display_disable(struct omap_dss_device *dssdev);

67
drivers/video/omap2/dss/dsi.c
View File

@ -233,6 +233,7 @@ static struct
enum dsi_vc_mode mode;
struct omap_dss_device *dssdev;
enum fifo_size fifo_size;
int vc_id;
} vc[4];
struct mutex lock;
@ -1764,8 +1765,6 @@ static void dsi_vc_initial_config(int channel)
r = FLD_MOD(r, 4, 23, 21); /* DMA_TX_REQ_NB = no dma */
dsi_write_reg(DSI_VC_CTRL(channel), r);
dsi.vc[channel].mode = DSI_VC_MODE_L4;
}
static int dsi_vc_config_l4(int channel)
@ -1972,7 +1971,7 @@ static inline void dsi_vc_write_long_header(int channel, u8 data_type,
WARN_ON(!dsi_bus_is_locked());
data_id = data_type | channel << 6;
data_id = data_type | dsi.vc[channel].vc_id << 6;
val = FLD_VAL(data_id, 7, 0) | FLD_VAL(len, 23, 8) |
FLD_VAL(ecc, 31, 24);
@ -2075,7 +2074,7 @@ static int dsi_vc_send_short(int channel, u8 data_type, u16 data, u8 ecc)
return -EINVAL;
}
data_id = data_type | channel << 6;
data_id = data_type | dsi.vc[channel].vc_id << 6;
r = (data_id << 0) | (data << 8) | (ecc << 24);
@ -3250,6 +3249,57 @@ int dsi_init_display(struct omap_dss_device *dssdev)
return 0;
}
int omap_dsi_request_vc(struct omap_dss_device *dssdev, int *channel)
{
int i;
for (i = 0; i < ARRAY_SIZE(dsi.vc); i++) {
if (!dsi.vc[i].dssdev) {
dsi.vc[i].dssdev = dssdev;
*channel = i;
return 0;
}
}
DSSERR("cannot get VC for display %s", dssdev->name);
return -ENOSPC;
}
EXPORT_SYMBOL(omap_dsi_request_vc);
int omap_dsi_set_vc_id(struct omap_dss_device *dssdev, int channel, int vc_id)
{
if (vc_id < 0 || vc_id > 3) {
DSSERR("VC ID out of range\n");
return -EINVAL;
}
if (channel < 0 || channel > 3) {
DSSERR("Virtual Channel out of range\n");
return -EINVAL;
}
if (dsi.vc[channel].dssdev != dssdev) {
DSSERR("Virtual Channel not allocated to display %s\n",
dssdev->name);
return -EINVAL;
}
dsi.vc[channel].vc_id = vc_id;
return 0;
}
EXPORT_SYMBOL(omap_dsi_set_vc_id);
void omap_dsi_release_vc(struct omap_dss_device *dssdev, int channel)
{
if ((channel >= 0 && channel <= 3) &&
dsi.vc[channel].dssdev == dssdev) {
dsi.vc[channel].dssdev = NULL;
dsi.vc[channel].vc_id = 0;
}
}
EXPORT_SYMBOL(omap_dsi_release_vc);
void dsi_wait_pll_hsdiv_dispc_active(void)
{
if (wait_for_bit_change(DSI_PLL_STATUS, 7, 1) != 1)
@ -3269,7 +3319,7 @@ void dsi_wait_pll_hsdiv_dsi_active(void)
static int dsi_init(struct platform_device *pdev)
{
u32 rev;
int r;
int r, i;
struct resource *dsi_mem;
spin_lock_init(&dsi.errors_lock);
@ -3323,6 +3373,13 @@ static int dsi_init(struct platform_device *pdev)
goto err2;
}
/* DSI VCs initialization */
for (i = 0; i < ARRAY_SIZE(dsi.vc); i++) {
dsi.vc[i].mode = DSI_VC_MODE_L4;
dsi.vc[i].dssdev = NULL;
dsi.vc[i].vc_id = 0;
}
enable_clocks(1);
rev = dsi_read_reg(DSI_REVISION);