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FUI: Fill in link_m and link_n values 

... based on the EDID detailed timing values for
pixel_clock and link_clock.

Two undocumented registers 0x6f040 and 0x6f044 correspond to link_m and link_n
respectively.  Other two undocumented registers 0x6f030 and 0x6f034 correspond
to data_m and data_n respectively.

Calculations are based on the intel_link_compute_m_n from linux kernel.

Currently, the value for 0x6f030 does not come up right with our calculations.
Hence, set to hard-coded value.

Change-Id: I40ff411729d0a61759164c3c1098504973f9cf5e
Reviewed-on: https://gerrit.chromium.org/gerrit/62915
Reviewed-by: Ronald G. Minnich <rminnich@chromium.org>
Tested-by: Furquan Shaikh <furquan@chromium.org>
Commit-Queue: Furquan Shaikh <furquan@chromium.org>
Reviewed-on: http://review.coreboot.org/4381
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
This commit is contained in:
Furquan Shaikh 2013-07-22 16:18:31 -07:00 committed by Patrick Georgi
parent 3d9b5a2931
commit 6b19071ffb
7 changed files with 98 additions and 27 deletions
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14
src/drivers/intel/gma/i915.h
View File

@ -65,6 +65,14 @@ void io_i915_write32(unsigned long val, unsigned long addr);
#define DP_LINK_CONFIGURATION_SIZE 9
struct intel_dp_m_n {
uint32_t tu;
uint32_t gmch_m;
uint32_t gmch_n;
uint32_t link_m;
uint32_t link_n;
};
struct intel_dp {
int gen; // 6 for link, 7 for wtm2
int has_pch_split; // 1 for link and wtm2
@ -134,6 +142,7 @@ struct intel_dp {
u32 pfa_ctl;
u32 pipesrc;
u32 stride;
struct intel_dp_m_n m_n;
};
/* we may yet need these. */
@ -183,3 +192,8 @@ void intel_dp_wait_reg(unsigned long addr,
void intel_dp_wait_panel_power_control(unsigned long val);
void intel_dp_compute_m_n(unsigned int bits_per_pixel,
unsigned int nlanes,
unsigned int pixel_clock,
unsigned int link_clock,
struct intel_dp_m_n *m_n);

4
src/drivers/intel/gma/i915_reg.h
View File

@ -3321,6 +3321,10 @@
#define _PIPEA_DATA_M1 0x60030
#define TU_SIZE(x) (((x)-1) << 25) /* default size 64 */
#define TU_SIZE_MASK 0x7e000000
#define DATA_LINK_M_N_MASK (0xffffff)
#define DATA_LINK_N_MAX (0x800000)
#define PIPE_DATA_M1_OFFSET 0
#define _PIPEA_DATA_N1 0x60034
#define PIPE_DATA_N1_OFFSET 0

58
src/drivers/intel/gma/intel_dp.c
View File

@ -393,37 +393,51 @@ intel_dp_i2c_init(struct intel_dp *intel_dp)
return ret;
}
struct intel_dp_m_n {
uint32_t tu;
uint32_t gmch_m;
uint32_t gmch_n;
uint32_t link_m;
uint32_t link_n;
};
static void
intel_reduce_ratio(uint32_t *num, uint32_t *den)
intel_reduce_m_n_ratio(uint32_t *num, uint32_t *den)
{
while (*num > 0xffffff || *den > 0xffffff) {
while (*num > DATA_LINK_M_N_MASK || *den > DATA_LINK_M_N_MASK) {
*num >>= 1;
*den >>= 1;
}
}
static void
intel_dp_compute_m_n(int bpp,
int nlanes,
int pixel_clock,
int link_clock,
struct intel_dp_m_n *m_n)
unsigned int roundup_power_of_two(unsigned int n);
unsigned int roundup_power_of_two(unsigned int n)
{
n--;
n |= n >> 1;
n |= n >> 2;
n |= n >> 4;
n |= n >> 8;
n |= n >> 16;
n++;
return n;
}
static void compute_m_n(unsigned int m, unsigned int n,
unsigned int *ret_m, unsigned int *ret_n)
{
*ret_n = MIN(roundup_power_of_two(n), DATA_LINK_N_MAX);
*ret_m = ( (unsigned long long)m * *ret_n) / n;
intel_reduce_m_n_ratio(ret_m, ret_n);
}
void intel_dp_compute_m_n(unsigned int bits_per_pixel,
unsigned int nlanes,
unsigned int pixel_clock,
unsigned int link_clock,
struct intel_dp_m_n *m_n)
{
m_n->tu = 64;
m_n->gmch_m = (pixel_clock * bpp) >> 3;
m_n->gmch_n = link_clock * nlanes;
intel_reduce_ratio(&m_n->gmch_m, &m_n->gmch_n);
m_n->link_m = pixel_clock;
m_n->link_n = link_clock;
intel_reduce_ratio(&m_n->link_m, &m_n->link_n);
compute_m_n(bits_per_pixel * pixel_clock,
link_clock * nlanes * 8,
&m_n->gmch_m, &m_n->gmch_n);
compute_m_n(pixel_clock, link_clock,
&m_n->link_m, &m_n->link_n);
}
/* not sure. */

2
src/include/edid.h
View File

@ -45,6 +45,8 @@ struct edid {
/* used to compute timing for graphics chips. */
unsigned char phsync;
unsigned char pvsync;
unsigned int pixel_clock;
unsigned int link_clock;
unsigned int ha;
unsigned int hbl;
unsigned int hso;

6
src/lib/edid.c
View File

@ -447,6 +447,8 @@ detailed_block(struct edid *out, unsigned char *x, int in_extension)
}
if (! did_detailed_timing){
/* Edid contains pixel clock in terms of 10KHz */
out->pixel_clock = (x[0] + (x[1] << 8)) * 10;
out->ha = (x[2] + ((x[4] & 0xF0) << 4));
out->hbl = (x[3] + ((x[4] & 0x0F) << 8));
out->hso = (x[8] + ((x[11] & 0xC0) << 2));
@ -517,11 +519,11 @@ detailed_block(struct edid *out, unsigned char *x, int in_extension)
break;
}
printk(BIOS_SPEW, "Detailed mode (IN HEX): Clock %d0 KHz, %x mm x %x mm\n"
printk(BIOS_SPEW, "Detailed mode (IN HEX): Clock %d KHz, %x mm x %x mm\n"
" %04x %04x %04x %04x hborder %x\n"
" %04x %04x %04x %04x vborder %x\n"
" %chsync %cvsync%s%s %s\n",
(x[0] + (x[1] << 8)),
out->pixel_clock,
(x[12] + ((x[14] & 0xF0) << 4)),
(x[13] + ((x[14] & 0x0F) << 8)),
out->ha, out->ha + out->hso, out->ha + out->hso + out->hspw,

30
src/mainboard/google/slippy/gma.c
View File

@ -288,6 +288,12 @@ void dp_init_dim_regs(struct intel_dp *dp)
dp->pfa_sz = (edid->ha << 16) | (edid->va);
intel_dp_compute_m_n(dp->bpp,
dp->lane_count,
dp->edid.pixel_clock,
dp->edid.link_clock,
&dp->m_n);
printk(BIOS_SPEW, "dp->stride = 0x%08x\n",dp->stride);
printk(BIOS_SPEW, "dp->htotal = 0x%08x\n", dp->htotal);
printk(BIOS_SPEW, "dp->hblank = 0x%08x\n", dp->hblank);
@ -299,6 +305,26 @@ void dp_init_dim_regs(struct intel_dp *dp)
printk(BIOS_SPEW, "dp->pfa_pos = 0x%08x\n", dp->pfa_pos);
printk(BIOS_SPEW, "dp->pfa_ctl = 0x%08x\n", dp->pfa_ctl);
printk(BIOS_SPEW, "dp->pfa_sz = 0x%08x\n", dp->pfa_sz);
printk(BIOS_SPEW, "dp->link_m = 0x%08x\n", dp->m_n.link_m);
printk(BIOS_SPEW, "dp->link_n = 0x%08x\n", dp->m_n.link_n);
printk(BIOS_SPEW, "0x6f030 = 0x%08x\n", TU_SIZE(dp->m_n.tu) | dp->m_n.gmch_m);
printk(BIOS_SPEW, "0x6f030 = 0x%08x\n", dp->m_n.gmch_m);
printk(BIOS_SPEW, "0x6f034 = 0x%08x\n", dp->m_n.gmch_n);
}
int intel_dp_bw_code_to_link_rate(u8 link_bw);
int intel_dp_bw_code_to_link_rate(u8 link_bw)
{
switch (link_bw) {
case DP_LINK_BW_1_62:
default:
return 162000;
case DP_LINK_BW_2_7:
return 270000;
case DP_LINK_BW_5_4:
return 540000;
}
}
int i915lightup(unsigned int physbase, unsigned int iobase, unsigned int mmio,
@ -366,6 +392,10 @@ int i915lightup(unsigned int pphysbase, unsigned int piobase,
edid_ok = decode_edid(dp->rawedid, dp->edidlen, &dp->edid);
printk(BIOS_SPEW, "decode edid returns %d\n", edid_ok);
dp->edid.link_clock = intel_dp_bw_code_to_link_rate(dp->link_bw);
printk(BIOS_SPEW, "pixel_clock is %i, link_clock is %i\n",dp->edid.pixel_clock, dp->edid.link_clock);
dp_init_dim_regs(dp);
/* more undocumented stuff. */

11
src/mainboard/google/slippy/i915io.c
View File

@ -117,9 +117,14 @@ printk(BIOS_SPEW, "DP_MAX_DOWNSPREAD");
/* undocumented. */
io_i915_write32(0x7e4a0000,0x6f030);
io_i915_write32(0x00800000,0x6f034);
io_i915_write32(0x00021000,0x6f040);
io_i915_write32(0x00080000,0x6f044);
/* io_i915_write32(0x00800000,0x6f034); */
/* Write to 0x6f030 has to be 0x7e4ayyyy -- First four hex digits are important.
However, with our formula we always see values 0x7e43yyyy (1366 panel) and
0x7e42yyy (1280 panel) */
/* io_i915_write32(TU_SIZE(dp->m_n.tu) | dp->m_n.gmch_m,0x6f030); */
io_i915_write32(dp->m_n.gmch_n,0x6f034);
io_i915_write32(dp->m_n.link_m,0x6f040);
io_i915_write32(dp->m_n.link_n,0x6f044);
/* leave as is for now. */
io_i915_write32(dp->htotal,0x6f000);