[PATCH v3 10/18] drm/i915/dmc_wl: Allow simpler syntax for single reg in range tables

[Gustavo Sousa <gustavo.sousa@intel.com>]

Allow simpler syntax for defining entries for single registers in range
tables. That makes them easier to type as well as to read, allowing one
to quickly tell whether a range actually refers to a single register or
a "true range".

Reviewed-by: Luca Coelho <luciano.coelho@intel.com>
Signed-off-by: Gustavo Sousa <gustavo.sousa@intel.com>
---
 drivers/gpu/drm/i915/display/intel_dmc_wl.c | 118 ++++++++++----------
 1 file changed, 60 insertions(+), 58 deletions(-)

diff --git a/drivers/gpu/drm/i915/display/intel_dmc_wl.c b/drivers/gpu/drm/i915/display/intel_dmc_wl.c
index db01b65cb05d..4a182a049374 100644
--- a/drivers/gpu/drm/i915/display/intel_dmc_wl.c
+++ b/drivers/gpu/drm/i915/display/intel_dmc_wl.c
@@ -58,82 +58,82 @@ static struct intel_dmc_wl_range powered_off_ranges[] = {
 };
 
 static struct intel_dmc_wl_range xe3lpd_dc5_dc6_dmc_ranges[] = {
-	{ .start = 0x45500, .end = 0x45500 }, /* DC_STATE_SEL */
+	{ .start = 0x45500 }, /* DC_STATE_SEL */
 	{ .start = 0x457a0, .end = 0x457b0 }, /* DC*_RESIDENCY_COUNTER */
-	{ .start = 0x45504, .end = 0x45504 }, /* DC_STATE_EN */
+	{ .start = 0x45504 }, /* DC_STATE_EN */
 	{ .start = 0x45400, .end = 0x4540c }, /* PWR_WELL_CTL_* */
-	{ .start = 0x454f0, .end = 0x454f0 }, /* RETENTION_CTRL */
+	{ .start = 0x454f0 }, /* RETENTION_CTRL */
 
 	/* DBUF_CTL_* */
-	{ .start = 0x44300, .end = 0x44300 },
-	{ .start = 0x44304, .end = 0x44304 },
-	{ .start = 0x44f00, .end = 0x44f00 },
-	{ .start = 0x44f04, .end = 0x44f04 },
-	{ .start = 0x44fe8, .end = 0x44fe8 },
-	{ .start = 0x45008, .end = 0x45008 },
+	{ .start = 0x44300 },
+	{ .start = 0x44304 },
+	{ .start = 0x44f00 },
+	{ .start = 0x44f04 },
+	{ .start = 0x44fe8 },
+	{ .start = 0x45008 },
 
-	{ .start = 0x46070, .end = 0x46070 }, /* CDCLK_PLL_ENABLE */
-	{ .start = 0x46000, .end = 0x46000 }, /* CDCLK_CTL */
-	{ .start = 0x46008, .end = 0x46008 }, /* CDCLK_SQUASH_CTL */
+	{ .start = 0x46070 }, /* CDCLK_PLL_ENABLE */
+	{ .start = 0x46000 }, /* CDCLK_CTL */
+	{ .start = 0x46008 }, /* CDCLK_SQUASH_CTL */
 
 	/* TRANS_CMTG_CTL_* */
-	{ .start = 0x6fa88, .end = 0x6fa88 },
-	{ .start = 0x6fb88, .end = 0x6fb88 },
-
-	{ .start = 0x46430, .end = 0x46430 }, /* CHICKEN_DCPR_1 */
-	{ .start = 0x46434, .end = 0x46434 }, /* CHICKEN_DCPR_2 */
-	{ .start = 0x454a0, .end = 0x454a0 }, /* CHICKEN_DCPR_4 */
-	{ .start = 0x42084, .end = 0x42084 }, /* CHICKEN_MISC_2 */
-	{ .start = 0x42088, .end = 0x42088 }, /* CHICKEN_MISC_3 */
-	{ .start = 0x46160, .end = 0x46160 }, /* CMTG_CLK_SEL */
+	{ .start = 0x6fa88 },
+	{ .start = 0x6fb88 },
+
+	{ .start = 0x46430 }, /* CHICKEN_DCPR_1 */
+	{ .start = 0x46434 }, /* CHICKEN_DCPR_2 */
+	{ .start = 0x454a0 }, /* CHICKEN_DCPR_4 */
+	{ .start = 0x42084 }, /* CHICKEN_MISC_2 */
+	{ .start = 0x42088 }, /* CHICKEN_MISC_3 */
+	{ .start = 0x46160 }, /* CMTG_CLK_SEL */
 	{ .start = 0x8f000, .end = 0x8ffff }, /* Main DMC registers */
 
 	{},
 };
 
 static struct intel_dmc_wl_range xe3lpd_dc3co_dmc_ranges[] = {
-	{ .start = 0x454a0, .end = 0x454a0 }, /* CHICKEN_DCPR_4 */
+	{ .start = 0x454a0 }, /* CHICKEN_DCPR_4 */
 
-	{ .start = 0x45504, .end = 0x45504 }, /* DC_STATE_EN */
+	{ .start = 0x45504 }, /* DC_STATE_EN */
 
 	/* DBUF_CTL_* */
-	{ .start = 0x44300, .end = 0x44300 },
-	{ .start = 0x44304, .end = 0x44304 },
-	{ .start = 0x44f00, .end = 0x44f00 },
-	{ .start = 0x44f04, .end = 0x44f04 },
-	{ .start = 0x44fe8, .end = 0x44fe8 },
-	{ .start = 0x45008, .end = 0x45008 },
-
-	{ .start = 0x46070, .end = 0x46070 }, /* CDCLK_PLL_ENABLE */
-	{ .start = 0x46000, .end = 0x46000 }, /* CDCLK_CTL */
-	{ .start = 0x46008, .end = 0x46008 }, /* CDCLK_SQUASH_CTL */
+	{ .start = 0x44300 },
+	{ .start = 0x44304 },
+	{ .start = 0x44f00 },
+	{ .start = 0x44f04 },
+	{ .start = 0x44fe8 },
+	{ .start = 0x45008 },
+
+	{ .start = 0x46070 }, /* CDCLK_PLL_ENABLE */
+	{ .start = 0x46000 }, /* CDCLK_CTL */
+	{ .start = 0x46008 }, /* CDCLK_SQUASH_CTL */
 	{ .start = 0x8f000, .end = 0x8ffff }, /* Main DMC registers */
 
 	/* Scanline registers */
-	{ .start = 0x70000, .end = 0x70000 },
-	{ .start = 0x70004, .end = 0x70004 },
-	{ .start = 0x70014, .end = 0x70014 },
-	{ .start = 0x70018, .end = 0x70018 },
-	{ .start = 0x71000, .end = 0x71000 },
-	{ .start = 0x71004, .end = 0x71004 },
-	{ .start = 0x71014, .end = 0x71014 },
-	{ .start = 0x71018, .end = 0x71018 },
-	{ .start = 0x72000, .end = 0x72000 },
-	{ .start = 0x72004, .end = 0x72004 },
-	{ .start = 0x72014, .end = 0x72014 },
-	{ .start = 0x72018, .end = 0x72018 },
-	{ .start = 0x73000, .end = 0x73000 },
-	{ .start = 0x73004, .end = 0x73004 },
-	{ .start = 0x73014, .end = 0x73014 },
-	{ .start = 0x73018, .end = 0x73018 },
-	{ .start = 0x7b000, .end = 0x7b000 },
-	{ .start = 0x7b004, .end = 0x7b004 },
-	{ .start = 0x7b014, .end = 0x7b014 },
-	{ .start = 0x7b018, .end = 0x7b018 },
-	{ .start = 0x7c000, .end = 0x7c000 },
-	{ .start = 0x7c004, .end = 0x7c004 },
-	{ .start = 0x7c014, .end = 0x7c014 },
-	{ .start = 0x7c018, .end = 0x7c018 },
+	{ .start = 0x70000 },
+	{ .start = 0x70004 },
+	{ .start = 0x70014 },
+	{ .start = 0x70018 },
+	{ .start = 0x71000 },
+	{ .start = 0x71004 },
+	{ .start = 0x71014 },
+	{ .start = 0x71018 },
+	{ .start = 0x72000 },
+	{ .start = 0x72004 },
+	{ .start = 0x72014 },
+	{ .start = 0x72018 },
+	{ .start = 0x73000 },
+	{ .start = 0x73004 },
+	{ .start = 0x73014 },
+	{ .start = 0x73018 },
+	{ .start = 0x7b000 },
+	{ .start = 0x7b004 },
+	{ .start = 0x7b014 },
+	{ .start = 0x7b018 },
+	{ .start = 0x7c000 },
+	{ .start = 0x7c004 },
+	{ .start = 0x7c014 },
+	{ .start = 0x7c018 },
 
 	{},
 };
@@ -187,7 +187,9 @@ static bool intel_dmc_wl_reg_in_range(i915_reg_t reg,
 	u32 offset = i915_mmio_reg_offset(reg);
 
 	for (int i = 0; ranges[i].start; i++) {
-		if (ranges[i].start <= offset && offset <= ranges[i].end)
+		u32 end = ranges[i].end ?: ranges[i].start;
+
+		if (ranges[i].start <= offset && offset <= end)
 			return true;
 	}
 
-- 
2.47.0