ram: rk3399: update calculate_stride

Update the calculation of the stride to support all the DRAM case.

Signed-off-by: YouMin Chen <cym@rock-chips.com>
Signed-off-by: Kever Yang <kever.yang@rock-chips.com>

diff --git a/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h b/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h
index f0a664478f673c590573ee1f0f1ef6ab5c504468..267649fda4cb6fc82b280c024319edc9f8cb568d 100644 (file)
--- a/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h
+++ b/arch/arm/include/asm/arch-rockchip/sdram_rk3399.h
@@ -85,4 +85,13 @@ struct rk3399_sdram_params {
 #define PI_WDQ_LEVELING                BIT(4)
 #define PI_FULL_TRAINING       0xff
 
+enum {
+       STRIDE_128B = 0,
+       STRIDE_256B = 1,
+       STRIDE_512B = 2,
+       STRIDE_4KB = 3,
+       UN_STRIDE = 4,
+       PART_STRIDE = 5,
+};
+
 #endif

diff --git a/drivers/ram/rockchip/sdram_rk3399.c b/drivers/ram/rockchip/sdram_rk3399.c
index 4ecc6267e5e599f8340b3995518ccd6757cfa01d..47552fa946fd842600e8739c546b5f57133d52c1 100644 (file)
--- a/drivers/ram/rockchip/sdram_rk3399.c
+++ b/drivers/ram/rockchip/sdram_rk3399.c
@@ -2758,15 +2758,20 @@ error:
 
 static unsigned char calculate_stride(struct rk3399_sdram_params *params)
 {
-       unsigned int stride = params->base.stride;
-       unsigned int channel, chinfo = 0;
+       unsigned int gstride_type;
+       unsigned int channel;
+       unsigned int chinfo = 0;
+       unsigned int cap = 0;
+       unsigned int stride = -1;
        unsigned int ch_cap[2] = {0, 0};
-       u64 cap;
+
+       gstride_type = STRIDE_256B;
 
        for (channel = 0; channel < 2; channel++) {
                unsigned int cs0_cap = 0;
                unsigned int cs1_cap = 0;
-               struct sdram_cap_info *cap_info = &params->ch[channel].cap_info;
+               struct sdram_cap_info *cap_info =
+                       &params->ch[channel].cap_info;
 
                if (cap_info->col == 0)
                        continue;
@@ -2784,49 +2789,124 @@ static unsigned char calculate_stride(struct rk3399_sdram_params *params)
                chinfo |= 1 << channel;
        }
 
-       /* stride calculation for 1 channel */
-       if (params->base.num_channels == 1 && chinfo & 1)
-               return 0x17;    /* channel a */
-
-       /* stride calculation for 2 channels, default gstride type is 256B */
-       if (ch_cap[0] == ch_cap[1]) {
-               cap = ch_cap[0] + ch_cap[1];
-               switch (cap) {
-               /* 512MB */
-               case 512:
-                       stride = 0;
-                       break;
-               /* 1GB */
-               case 1024:
-                       stride = 0x5;
-                       break;
+       cap = ch_cap[0] + ch_cap[1];
+       if (params->base.num_channels == 1) {
+               if (chinfo & 1) /* channel a only */
+                       stride = 0x17;
+               else /* channel b only */
+                       stride = 0x18;
+       } else {/* 2 channel */
+               if (ch_cap[0] == ch_cap[1]) {
+                       /* interleaved */
+                       if (gstride_type == PART_STRIDE) {
+                       /*
+                        * first 64MB no interleaved other 256B interleaved
+                        * if 786M+768M.useful space from 0-1280MB and
+                        * 1536MB-1792MB
+                        * if 1.5G+1.5G(continuous).useful space from 0-2560MB
+                        * and 3072MB-3584MB
+                        */
+                               stride = 0x1F;
+                       } else {
+                               switch (cap) {
+                               /* 512MB */
+                               case 512:
+                                       stride = 0;
+                                       break;
+                               /* 1GB unstride or 256B stride*/
+                               case 1024:
+                                       stride = (gstride_type == UN_STRIDE) ?
+                                               0x1 : 0x5;
+                                       break;
+                               /*
+                                * 768MB + 768MB same as total 2GB memory
+                                * useful space: 0-768MB 1GB-1792MB
+                                */
+                               case 1536:
+                               /* 2GB unstride or 256B or 512B stride */
+                               case 2048:
+                                       stride = (gstride_type == UN_STRIDE) ?
+                                               0x2 :
+                                               ((gstride_type == STRIDE_512B) ?
+                                                0xA : 0x9);
+                                       break;
+                               /* 1536MB + 1536MB */
+                               case 3072:
+                                       stride = (gstride_type == UN_STRIDE) ?
+                                               0x3 :
+                                               ((gstride_type == STRIDE_512B) ?
+                                                0x12 : 0x11);
+                                       break;
+                               /* 4GB  unstride or 128B,256B,512B,4KB stride */
+                               case 4096:
+                                       stride = (gstride_type == UN_STRIDE) ?
+                                               0x3 : (0xC + gstride_type);
+                                       break;
+                               }
+                       }
+               }
+               if (ch_cap[0] == 2048 && ch_cap[1] == 1024) {
+                       /* 2GB + 1GB */
+                       stride = (gstride_type == UN_STRIDE) ? 0x3 : 0x19;
+               }
                /*
-                * 768MB + 768MB same as total 2GB memory
-                * useful space: 0-768MB 1GB-1792MB
+                * remain two channel capability not equal OR capability
+                * power function of 2
                 */
-               case 1536:
-               /* 2GB */
-               case 2048:
-                       stride = 0x9;
-                       break;
-               /* 1536MB + 1536MB */
-               case 3072:
-                       stride = 0x11;
-                       break;
-               /* 4GB */
-               case 4096:
-                       stride = 0xD;
-                       break;
-               default:
-                       printf("%s: Unable to calculate stride for ", __func__);
-                       print_size((cap * (1 << 20)), " capacity\n");
-                       break;
+               if (stride == (-1)) {
+                       switch ((ch_cap[0] > ch_cap[1]) ?
+                               ch_cap[0] : ch_cap[1]) {
+                       case 256: /* 256MB + 128MB */
+                               stride = 0;
+                               break;
+                       case 512: /* 512MB + 256MB */
+                               stride = 1;
+                               break;
+                       case 1024:/* 1GB + 128MB/256MB/384MB/512MB/768MB */
+                               stride = 2;
+                               break;
+                       case 2048: /* 2GB + 128MB/256MB/384MB/512MB/768MB/1GB */
+                               stride = 3;
+                               break;
+                       default:
+                               break;
+                       }
                }
+               if (stride == (-1))
+                       goto error;
+       }
+       switch (stride) {
+       case 0xc:
+               printf("128B stride\n");
+               break;
+       case 5:
+       case 9:
+       case 0xd:
+       case 0x11:
+       case 0x19:
+               printf("256B stride\n");
+               break;
+       case 0xa:
+       case 0xe:
+       case 0x12:
+               printf("512B stride\n");
+               break;
+       case 0xf:
+               printf("4K stride\n");
+               break;
+       case 0x1f:
+               printf("32MB + 256B stride\n");
+               break;
+       default:
+               printf("no stride\n");
        }
 
        sdram_print_stride(stride);
 
        return stride;
+error:
+       printf("Cap not support!\n");
+       return (-1);
 }
 
 static void clear_channel_params(struct rk3399_sdram_params *params, u8 channel)