Simplify ast_astdp_read_edid(). Rename register constants. Drop
unnecessary error handling. On success, the helper returns 0; an
error code otherwise.
Signed-off-by: Thomas Zimmermann <tzimmermann@xxxxxxx>
---
drivers/gpu/drm/ast/ast_dp.c | 93 ++++++++++++++++-------------------
drivers/gpu/drm/ast/ast_reg.h | 12 +----
2 files changed, 44 insertions(+), 61 deletions(-)
diff --git a/drivers/gpu/drm/ast/ast_dp.c b/drivers/gpu/drm/ast/ast_dp.c
index 6cbde46f24dc..5d07678b502c 100644
--- a/drivers/gpu/drm/ast/ast_dp.c
+++ b/drivers/gpu/drm/ast/ast_dp.c
@@ -17,54 +17,55 @@ bool ast_astdp_is_connected(struct ast_device *ast)
int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata)
{
struct ast_device *ast = to_ast_device(dev);
- u8 i = 0, j = 0;
+ int ret = 0;
+ u8 i;
- /*
- * CRE5[b0]: Host reading EDID process is done
- */
- if (!(ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xE5, ASTDP_HOST_EDID_READ_DONE_MASK)))
- goto err_astdp_edid_not_ready;
-
- ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE5, (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
- 0x00);
+ /* Start reading EDID data */
+ ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5, (u8)~AST_IO_VGACRE5_EDID_READ_DONE, 0x00);
for (i = 0; i < 32; i++) {
+ unsigned int j;
+
/*
* CRE4[7:0]: Read-Pointer for EDID (Unit: 4bytes); valid range: 0~64
*/
- ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE4,
- ASTDP_AND_CLEAR_MASK, (u8)i);
- j = 0;
+ ast_set_index_reg(ast, AST_IO_VGACRI, 0xe4, i);
/*
* CRD7[b0]: valid flag for EDID
* CRD6[b0]: mirror read pointer for EDID
*/
- while ((ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xD7,
- ASTDP_EDID_VALID_FLAG_MASK) != 0x01) ||
- (ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xD6,
- ASTDP_EDID_READ_POINTER_MASK) != i)) {
+ for (j = 0; j < 200; ++j) {
+ u8 vgacrd7, vgacrd6;
+
/*
* Delay are getting longer with each retry.
- * 1. The Delays are often 2 loops when users request "Display Settings"
+ *
+ * 1. No delay on first try
+ * 2. The Delays are often 2 loops when users request "Display Settings"
* of right-click of mouse.
- * 2. The Delays are often longer a lot when system resume from S3/S4.
+ * 3. The Delays are often longer a lot when system resume from S3/S4.
*/
- mdelay(j+1);
-
- j++;
- if (j > 200)
- goto err_astdp_jump_out_loop_of_edid;
+ if (j)
+ mdelay(j + 1);
+
+ /* Wait for EDID offset to show up in mirror register */
+ vgacrd7 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd7);
+ if (vgacrd7 & AST_IO_VGACRD7_EDID_VALID_FLAG) {
+ vgacrd6 = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd6);
+ if (vgacrd6 == i)
+ break;
+ }
+ }
+ if (j == 200) {
+ ret = -EBUSY;
+ goto out;
}
- *(ediddata) = ast_get_index_reg_mask(ast, AST_IO_VGACRI,
- 0xD8, ASTDP_EDID_READ_DATA_MASK);
- *(ediddata + 1) = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xD9,
- ASTDP_EDID_READ_DATA_MASK);
- *(ediddata + 2) = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xDA,
- ASTDP_EDID_READ_DATA_MASK);
- *(ediddata + 3) = ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xDB,
- ASTDP_EDID_READ_DATA_MASK);
+ ediddata[0] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd8);
+ ediddata[1] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xd9);
+ ediddata[2] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xda);
+ ediddata[3] = ast_get_index_reg(ast, AST_IO_VGACRI, 0xdb);
if (i == 31) {
/*
@@ -76,29 +77,19 @@ int ast_astdp_read_edid(struct drm_device *dev, u8 *ediddata)
* The Bytes-126 indicates the Number of extensions to
* follow. 0 represents noextensions.
*/
- *(ediddata + 3) = *(ediddata + 3) + *(ediddata + 2);
- *(ediddata + 2) = 0;
+ ediddata[3] = ediddata[3] + ediddata[2];
+ ediddata[2] = 0;
}
ediddata += 4;
}
- ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE5, (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
- ASTDP_HOST_EDID_READ_DONE);
-
- return 0;
-
-err_astdp_jump_out_loop_of_edid:
- ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE5,
- (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
- ASTDP_HOST_EDID_READ_DONE);
- return (~(j+256) + 1);
-
-err_astdp_edid_not_ready:
- if (!(ast_get_index_reg_mask(ast, AST_IO_VGACRI, 0xE5, ASTDP_HOST_EDID_READ_DONE_MASK)))
- return (~0xE5 + 1);
+out:
+ /* Signal end of reading */
+ ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5, (u8)~AST_IO_VGACRE5_EDID_READ_DONE,
+ AST_IO_VGACRE5_EDID_READ_DONE);
- return 0;
+ return ret;
}
/*
@@ -122,9 +113,9 @@ int ast_dp_launch(struct ast_device *ast)
return -ENODEV;
}
- ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xE5,
- (u8) ~ASTDP_HOST_EDID_READ_DONE_MASK,
- ASTDP_HOST_EDID_READ_DONE);
+ ast_set_index_reg_mask(ast, AST_IO_VGACRI, 0xe5,
+ (u8) ~AST_IO_VGACRE5_EDID_READ_DONE,
+ AST_IO_VGACRE5_EDID_READ_DONE);
return 0;
}
diff --git a/drivers/gpu/drm/ast/ast_reg.h b/drivers/gpu/drm/ast/ast_reg.h
index 28bb43f6795b..040961cc1a19 100644
--- a/drivers/gpu/drm/ast/ast_reg.h
+++ b/drivers/gpu/drm/ast/ast_reg.h
@@ -38,8 +38,10 @@
#define AST_IO_VGACRCB_HWC_ENABLED BIT(1)
#define AST_IO_VGACRD1_MCU_FW_EXECUTING BIT(5)
+#define AST_IO_VGACRD7_EDID_VALID_FLAG BIT(0)
#define AST_IO_VGACRDC_LINK_SUCCESS BIT(0)
#define AST_IO_VGACRDF_HPD BIT(0)
+#define AST_IO_VGACRE5_EDID_READ_DONE BIT(0)
#define AST_IO_VGAIR1_R (0x5A)
#define AST_IO_VGAIR1_VREFRESH BIT(3)
@@ -70,12 +72,6 @@
#define AST_DP_PHY_SLEEP BIT(4)
#define AST_DP_VIDEO_ENABLE BIT(0)
-/*
- * CRE5[b0]: Host reading EDID process is done
- */
-#define ASTDP_HOST_EDID_READ_DONE BIT(0)
-#define ASTDP_HOST_EDID_READ_DONE_MASK GENMASK(0, 0)
-
/*
* CRDF[b4]: Mirror of AST_DP_VIDEO_ENABLE
* Precondition: A. ~AST_DP_PHY_SLEEP &&
@@ -84,10 +80,6 @@
*/
#define ASTDP_MIRROR_VIDEO_ENABLE BIT(4)
-#define ASTDP_EDID_READ_POINTER_MASK GENMASK(7, 0)
-#define ASTDP_EDID_VALID_FLAG_MASK GENMASK(0, 0)
-#define ASTDP_EDID_READ_DATA_MASK GENMASK(7, 0)
-
/*
* ASTDP setmode registers:
* CRE0[7:0]: MISC0 ((0x00: 18-bpp) or (0x20: 24-bpp)
--
2.45.2
