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viafb: remove duplicated scaling code
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viafb: remove duplicated scaling code

The code for P4M900 does the same as for all newer IGPs so there is no
reason to duplicate it. Just reducing the code to maintain.

Signed-off-by: Florian Tobias Schandinat <FlorianSchandinat@gmx.de>
Cc: Joseph Chan <JosephChan@via.com.tw>
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Florian Tobias Schandinat authored and Florian Tobias Schandinat committed Jul 23, 2010
1 parent c7babeb commit 4a73d70
Showing 1 changed file with 2 additions and 73 deletions.
75 changes: 2 additions & 73 deletions drivers/video/via/lcd.c
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Original file line number Diff line number Diff line change
Expand Up @@ -75,8 +75,6 @@ static void check_diport_of_integrated_lvds(
static struct display_timing lcd_centering_timging(struct display_timing
mode_crt_reg,
struct display_timing panel_crt_reg);
static void viafb_load_scaling_factor_for_p4m900(int set_hres,
int set_vres, int panel_hres, int panel_vres);

static int check_lvds_chip(int device_id_subaddr, int device_id)
{
Expand Down Expand Up @@ -437,11 +435,6 @@ static void load_lcd_scaling(int set_hres, int set_vres, int panel_hres,

/* LCD Scaling Enable */
viafb_write_reg_mask(CR79, VIACR, 0x07, BIT0 + BIT1 + BIT2);
if (UNICHROME_P4M900 == viaparinfo->chip_info->gfx_chip_name) {
viafb_load_scaling_factor_for_p4m900(set_hres, set_vres,
panel_hres, panel_vres);
return;
}

/* Check if expansion for horizontal */
if (set_hres != panel_hres) {
Expand All @@ -464,6 +457,7 @@ static void load_lcd_scaling(int set_hres, int set_vres, int panel_hres,
case UNICHROME_CX700:
case UNICHROME_K8M890:
case UNICHROME_P4M890:
case UNICHROME_P4M900:
reg_value =
K800_LCD_HOR_SCF_FORMULA(set_hres, panel_hres);
/* Horizontal scaling enabled */
Expand Down Expand Up @@ -503,6 +497,7 @@ static void load_lcd_scaling(int set_hres, int set_vres, int panel_hres,
case UNICHROME_CX700:
case UNICHROME_K8M890:
case UNICHROME_P4M890:
case UNICHROME_P4M900:
reg_value =
K800_LCD_VER_SCF_FORMULA(set_vres, panel_vres);
/* Vertical scaling enabled */
Expand Down Expand Up @@ -1139,69 +1134,3 @@ bool viafb_lcd_get_mobile_state(bool *mobile)
return false;
}
}

static void viafb_load_scaling_factor_for_p4m900(int set_hres,
int set_vres, int panel_hres, int panel_vres)
{
int h_scaling_factor;
int v_scaling_factor;
u8 cra2 = 0;
u8 cr77 = 0;
u8 cr78 = 0;
u8 cr79 = 0;
u8 cr9f = 0;
/* Check if expansion for horizontal */
if (set_hres < panel_hres) {
/* Load Horizontal Scaling Factor */

/* For VIA_K8M800 or later chipsets. */
h_scaling_factor =
K800_LCD_HOR_SCF_FORMULA(set_hres, panel_hres);
/* HSCaleFactor[1:0] at CR9F[1:0] */
cr9f = h_scaling_factor & 0x0003;
/* HSCaleFactor[9:2] at CR77[7:0] */
cr77 = (h_scaling_factor & 0x03FC) >> 2;
/* HSCaleFactor[11:10] at CR79[5:4] */
cr79 = (h_scaling_factor & 0x0C00) >> 10;
cr79 <<= 4;

/* Horizontal scaling enabled */
cra2 = 0xC0;

DEBUG_MSG(KERN_INFO "Horizontal Scaling value = %d\n",
h_scaling_factor);
} else {
/* Horizontal scaling disabled */
cra2 = 0x00;
}

/* Check if expansion for vertical */
if (set_vres < panel_vres) {
/* Load Vertical Scaling Factor */

/* For VIA_K8M800 or later chipsets. */
v_scaling_factor =
K800_LCD_VER_SCF_FORMULA(set_vres, panel_vres);

/* Vertical scaling enabled */
cra2 |= 0x08;
/* VSCaleFactor[0] at CR79[3] */
cr79 |= ((v_scaling_factor & 0x0001) << 3);
/* VSCaleFactor[8:1] at CR78[7:0] */
cr78 |= (v_scaling_factor & 0x01FE) >> 1;
/* VSCaleFactor[10:9] at CR79[7:6] */
cr79 |= ((v_scaling_factor & 0x0600) >> 9) << 6;

DEBUG_MSG(KERN_INFO "Vertical Scaling value = %d\n",
v_scaling_factor);
} else {
/* Vertical scaling disabled */
cra2 |= 0x00;
}

viafb_write_reg_mask(CRA2, VIACR, cra2, BIT3 + BIT6 + BIT7);
viafb_write_reg_mask(CR77, VIACR, cr77, 0xFF);
viafb_write_reg_mask(CR78, VIACR, cr78, 0xFF);
viafb_write_reg_mask(CR79, VIACR, cr79, 0xF8);
viafb_write_reg_mask(CR9F, VIACR, cr9f, BIT0 + BIT1);
}

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