UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity
OpenCloudOS-Kernel/drivers/gpu/drm/i915/intel_dsi_pll.c

318 lines
8.9 KiB
C
Raw Blame History

/*
* Copyright © 2013 Intel Corporation
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy of this software and associated documentation files (the "Software"),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice (including the next
* paragraph) shall be included in all copies or substantial portions of the
* Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
* DEALINGS IN THE SOFTWARE.
*
* Authors:
* Shobhit Kumar <shobhit.kumar@intel.com>
* Yogesh Mohan Marimuthu <yogesh.mohan.marimuthu@intel.com>
*/
#include <linux/kernel.h>
#include "intel_drv.h"
#include "i915_drv.h"
#include "intel_dsi.h"
#define DSI_HSS_PACKET_SIZE 4
#define DSI_HSE_PACKET_SIZE 4
#define DSI_HSA_PACKET_EXTRA_SIZE 6
#define DSI_HBP_PACKET_EXTRA_SIZE 6
#define DSI_HACTIVE_PACKET_EXTRA_SIZE 6
#define DSI_HFP_PACKET_EXTRA_SIZE 6
#define DSI_EOTP_PACKET_SIZE 4
struct dsi_mnp {
u32 dsi_pll_ctrl;
u32 dsi_pll_div;
};
static const u32 lfsr_converts[] = {
426, 469, 234, 373, 442, 221, 110, 311, 411, /* 62 - 70 */
461, 486, 243, 377, 188, 350, 175, 343, 427, 213, /* 71 - 80 */
106, 53, 282, 397, 354, 227, 113, 56, 284, 142, /* 81 - 90 */
71, 35 /* 91 - 92 */
};
static u32 dsi_rr_formula(const struct drm_display_mode *mode,
int pixel_format, int video_mode_format,
int lane_count, bool eotp)
{
u32 bpp;
u32 hactive, vactive, hfp, hsync, hbp, vfp, vsync, vbp;
u32 hsync_bytes, hbp_bytes, hactive_bytes, hfp_bytes;
u32 bytes_per_line, bytes_per_frame;
u32 num_frames;
u32 bytes_per_x_frames, bytes_per_x_frames_x_lanes;
u32 dsi_bit_clock_hz;
u32 dsi_clk;
switch (pixel_format) {
default:
case VID_MODE_FORMAT_RGB888:
case VID_MODE_FORMAT_RGB666_LOOSE:
bpp = 24;
break;
case VID_MODE_FORMAT_RGB666:
bpp = 18;
break;
case VID_MODE_FORMAT_RGB565:
bpp = 16;
break;
}
hactive = mode->hdisplay;
vactive = mode->vdisplay;
hfp = mode->hsync_start - mode->hdisplay;
hsync = mode->hsync_end - mode->hsync_start;
hbp = mode->htotal - mode->hsync_end;
vfp = mode->vsync_start - mode->vdisplay;
vsync = mode->vsync_end - mode->vsync_start;
vbp = mode->vtotal - mode->vsync_end;
hsync_bytes = DIV_ROUND_UP(hsync * bpp, 8);
hbp_bytes = DIV_ROUND_UP(hbp * bpp, 8);
hactive_bytes = DIV_ROUND_UP(hactive * bpp, 8);
hfp_bytes = DIV_ROUND_UP(hfp * bpp, 8);
bytes_per_line = DSI_HSS_PACKET_SIZE + hsync_bytes +
DSI_HSA_PACKET_EXTRA_SIZE + DSI_HSE_PACKET_SIZE +
hbp_bytes + DSI_HBP_PACKET_EXTRA_SIZE +
hactive_bytes + DSI_HACTIVE_PACKET_EXTRA_SIZE +
hfp_bytes + DSI_HFP_PACKET_EXTRA_SIZE;
/*
* XXX: Need to accurately calculate LP to HS transition timeout and add
* it to bytes_per_line/bytes_per_frame.
*/
if (eotp && video_mode_format == VIDEO_MODE_BURST)
bytes_per_line += DSI_EOTP_PACKET_SIZE;
bytes_per_frame = vsync * bytes_per_line + vbp * bytes_per_line +
vactive * bytes_per_line + vfp * bytes_per_line;
if (eotp &&
(video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_PULSE ||
video_mode_format == VIDEO_MODE_NON_BURST_WITH_SYNC_EVENTS))
bytes_per_frame += DSI_EOTP_PACKET_SIZE;
num_frames = drm_mode_vrefresh(mode);
bytes_per_x_frames = num_frames * bytes_per_frame;
bytes_per_x_frames_x_lanes = bytes_per_x_frames / lane_count;
/* the dsi clock is divided by 2 in the hardware to get dsi ddr clock */
dsi_bit_clock_hz = bytes_per_x_frames_x_lanes * 8;
dsi_clk = dsi_bit_clock_hz / (1000 * 1000);
if (eotp && video_mode_format == VIDEO_MODE_BURST)
dsi_clk *= 2;
return dsi_clk;
}
#ifdef MNP_FROM_TABLE
struct dsi_clock_table {
u32 freq;
u8 m;
u8 p;
};
static const struct dsi_clock_table dsi_clk_tbl[] = {
{300, 72, 6}, {313, 75, 6}, {323, 78, 6}, {333, 80, 6},
{343, 82, 6}, {353, 85, 6}, {363, 87, 6}, {373, 90, 6},
{383, 92, 6}, {390, 78, 5}, {393, 79, 5}, {400, 80, 5},
{401, 80, 5}, {402, 80, 5}, {403, 81, 5}, {404, 81, 5},
{405, 81, 5}, {406, 81, 5}, {407, 81, 5}, {408, 82, 5},
{409, 82, 5}, {410, 82, 5}, {411, 82, 5}, {412, 82, 5},
{413, 83, 5}, {414, 83, 5}, {415, 83, 5}, {416, 83, 5},
{417, 83, 5}, {418, 84, 5}, {419, 84, 5}, {420, 84, 5},
{430, 86, 5}, {440, 88, 5}, {450, 90, 5}, {460, 92, 5},
{470, 75, 4}, {480, 77, 4}, {490, 78, 4}, {500, 80, 4},
{510, 82, 4}, {520, 83, 4}, {530, 85, 4}, {540, 86, 4},
{550, 88, 4}, {560, 90, 4}, {570, 91, 4}, {580, 70, 3},
{590, 71, 3}, {600, 72, 3}, {610, 73, 3}, {620, 74, 3},
{630, 76, 3}, {640, 77, 3}, {650, 78, 3}, {660, 79, 3},
{670, 80, 3}, {680, 82, 3}, {690, 83, 3}, {700, 84, 3},
{710, 85, 3}, {720, 86, 3}, {730, 88, 3}, {740, 89, 3},
{750, 90, 3}, {760, 91, 3}, {770, 92, 3}, {780, 62, 2},
{790, 63, 2}, {800, 64, 2}, {880, 70, 2}, {900, 72, 2},
{1000, 80, 2}, /* dsi clock frequency in Mhz*/
};
static int dsi_calc_mnp(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
{
unsigned int i;
u8 m;
u8 n;
u8 p;
u32 m_seed;
if (dsi_clk < 300 || dsi_clk > 1000)
return -ECHRNG;
for (i = 0; i <= ARRAY_SIZE(dsi_clk_tbl); i++) {
if (dsi_clk_tbl[i].freq > dsi_clk)
break;
}
m = dsi_clk_tbl[i].m;
p = dsi_clk_tbl[i].p;
m_seed = lfsr_converts[m - 62];
n = 1;
dsi_mnp->dsi_pll_ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + p - 2);
dsi_mnp->dsi_pll_div = (n - 1) << DSI_PLL_N1_DIV_SHIFT |
m_seed << DSI_PLL_M1_DIV_SHIFT;
return 0;
}
#else
static int dsi_calc_mnp(u32 dsi_clk, struct dsi_mnp *dsi_mnp)
{
u32 m, n, p;
u32 ref_clk;
u32 error;
u32 tmp_error;
u32 target_dsi_clk;
u32 calc_dsi_clk;
u32 calc_m;
u32 calc_p;
u32 m_seed;
if (dsi_clk < 300 || dsi_clk > 1150) {
DRM_ERROR("DSI CLK Out of Range\n");
return -ECHRNG;
}
ref_clk = 25000;
target_dsi_clk = dsi_clk * 1000;
error = 0xFFFFFFFF;
calc_m = 0;
calc_p = 0;
for (m = 62; m <= 92; m++) {
for (p = 2; p <= 6; p++) {
calc_dsi_clk = (m * ref_clk) / p;
if (calc_dsi_clk >= target_dsi_clk) {
tmp_error = calc_dsi_clk - target_dsi_clk;
if (tmp_error < error) {
error = tmp_error;
calc_m = m;
calc_p = p;
}
}
}
}
m_seed = lfsr_converts[calc_m - 62];
n = 1;
dsi_mnp->dsi_pll_ctrl = 1 << (DSI_PLL_P1_POST_DIV_SHIFT + calc_p - 2);
dsi_mnp->dsi_pll_div = (n - 1) << DSI_PLL_N1_DIV_SHIFT |
m_seed << DSI_PLL_M1_DIV_SHIFT;
return 0;
}
#endif
/*
* XXX: The muxing and gating is hard coded for now. Need to add support for
* sharing PLLs with two DSI outputs.
*/
static void vlv_configure_dsi_pll(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
struct intel_crtc *intel_crtc = to_intel_crtc(encoder->base.crtc);
const struct drm_display_mode *mode = &intel_crtc->config.adjusted_mode;
struct intel_dsi *intel_dsi = enc_to_intel_dsi(&encoder->base);
int ret;
struct dsi_mnp dsi_mnp;
u32 dsi_clk;
dsi_clk = dsi_rr_formula(mode, intel_dsi->pixel_format,
intel_dsi->video_mode_format,
intel_dsi->lane_count, !intel_dsi->eot_disable);
ret = dsi_calc_mnp(dsi_clk, &dsi_mnp);
if (ret) {
DRM_DEBUG_KMS("dsi_calc_mnp failed\n");
return;
}
dsi_mnp.dsi_pll_ctrl |= DSI_PLL_CLK_GATE_DSI0_DSIPLL;
DRM_DEBUG_KMS("dsi pll div %08x, ctrl %08x\n",
dsi_mnp.dsi_pll_div, dsi_mnp.dsi_pll_ctrl);
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, 0);
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_DIVIDER, dsi_mnp.dsi_pll_div);
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, dsi_mnp.dsi_pll_ctrl);
}
void vlv_enable_dsi_pll(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
u32 tmp;
DRM_DEBUG_KMS("\n");
mutex_lock(&dev_priv->dpio_lock);
vlv_configure_dsi_pll(encoder);
/* wait at least 0.5 us after ungating before enabling VCO */
usleep_range(1, 10);
tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
tmp |= DSI_PLL_VCO_EN;
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
mutex_unlock(&dev_priv->dpio_lock);
if (wait_for(I915_READ(PIPECONF(PIPE_A)) & PIPECONF_DSI_PLL_LOCKED, 20)) {
DRM_ERROR("DSI PLL lock failed\n");
return;
}
DRM_DEBUG_KMS("DSI PLL locked\n");
}
void vlv_disable_dsi_pll(struct intel_encoder *encoder)
{
struct drm_i915_private *dev_priv = encoder->base.dev->dev_private;
u32 tmp;
DRM_DEBUG_KMS("\n");
mutex_lock(&dev_priv->dpio_lock);
tmp = vlv_cck_read(dev_priv, CCK_REG_DSI_PLL_CONTROL);
tmp &= ~DSI_PLL_VCO_EN;
tmp |= DSI_PLL_LDO_GATE;
vlv_cck_write(dev_priv, CCK_REG_DSI_PLL_CONTROL, tmp);
mutex_unlock(&dev_priv->dpio_lock);
}
Reference in New Issue View Git Blame Copy Permalink