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authorArchit Taneja <archit@ti.com>2013-12-12 05:35:58 -0300
committerMauro Carvalho Chehab <m.chehab@samsung.com>2014-01-07 06:54:48 -0200
commit0df20f9657693c420b10e8d18f1472e0dd47d634 (patch)
treea75269443c5e9fd8012f5505d2935cf366a7871e /drivers/media/platform/ti-vpe/sc.h
parent44687b2e81165164d3b921e383592cc0f5e062a0 (diff)
[media] v4l: ti-vpe: support loading of scaler coefficients
The SC block in VPE/VIP contains a SRAM within it. This internal memory requires to be loaded with appropriate scaler coefficients from a contiguous block of memory through VPDMA. The horizontal and vertical scaler each require 2 sets of scaler coefficients for luma and chroma scaling. The horizontal polyphase scaler requires coefficients for a 32 phase and 8 tap filter. Similarly, the vertical scaler requires coefficients for a 5 tap filter. The choice of the scaler coefficients depends on the scaling ratio. Add coefficient tables for different scaling ratios in sc_coeffs.h. In the case of horizontal downscaling, we need to consider the change in ratio caused by decimation performed by the horizontal scaler. In order to load the scaler coefficients via VPDMA, a configuration descriptor is used in block mode. The payload for the descriptor is the scaler coefficients copied to memory. Coefficients for each phase have to be placed in memory in a particular order understood by the scaler hardware. The choice of the scaler coefficients, and the loading of the coefficients from our tables to a contiguous buffer is managed by the functions sc_set_hs_coefficients and sc_set_vs_coefficients. The sc_data handle is now added with some parameters to describe the state of the coefficients loaded in the SC block. 'loaded_coeff_h' and 'loaded_coeff_v' hold the address of the last dma buffer which was used by VPDMA to copy coefficients. This information can be used by a vpe mem-to-mem context to decide whether it should load coefficients or not. 'hs_index' and 'vs_index' provide some optimization by preventing loading of coefficients if the scaling ratio didn't change between 2 contexts. 'load_coeff_h' and 'load_coeff_v' tell the vpe/vip driver whether we need to load the coefficients through VPDMA or not. Signed-off-by: Archit Taneja <archit@ti.com> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
Diffstat (limited to 'drivers/media/platform/ti-vpe/sc.h')
-rw-r--r--drivers/media/platform/ti-vpe/sc.h31
1 files changed, 31 insertions, 0 deletions
diff --git a/drivers/media/platform/ti-vpe/sc.h b/drivers/media/platform/ti-vpe/sc.h
index 924854465c5d..c89f3d1a3bad 100644
--- a/drivers/media/platform/ti-vpe/sc.h
+++ b/drivers/media/platform/ti-vpe/sc.h
@@ -161,15 +161,46 @@
#define CFG_OFF_W_MASK 0x07ff
#define CFG_OFF_W_SHIFT 16
+/* number of phases supported by the polyphase scalers */
+#define SC_NUM_PHASES 32
+
+/* number of taps used by horizontal polyphase scaler */
+#define SC_H_NUM_TAPS 7
+
+/* number of taps used by vertical polyphase scaler */
+#define SC_V_NUM_TAPS 5
+
+/* number of taps expected by the scaler in it's coefficient memory */
+#define SC_NUM_TAPS_MEM_ALIGN 8
+
+/*
+ * coefficient memory size in bytes:
+ * num phases x num sets(luma and chroma) x num taps(aligned) x coeff size
+ */
+#define SC_COEF_SRAM_SIZE (SC_NUM_PHASES * 2 * SC_NUM_TAPS_MEM_ALIGN * 2)
+
struct sc_data {
void __iomem *base;
struct resource *res;
+ dma_addr_t loaded_coeff_h; /* loaded h coeffs in SC */
+ dma_addr_t loaded_coeff_v; /* loaded v coeffs in SC */
+
+ bool load_coeff_h; /* have new h SC coeffs */
+ bool load_coeff_v; /* have new v SC coeffs */
+
+ unsigned int hs_index; /* h SC coeffs selector */
+ unsigned int vs_index; /* v SC coeffs selector */
+
struct platform_device *pdev;
};
void sc_set_regs_bypass(struct sc_data *sc, u32 *sc_reg0);
void sc_dump_regs(struct sc_data *sc);
+void sc_set_hs_coeffs(struct sc_data *sc, void *addr, unsigned int src_w,
+ unsigned int dst_w);
+void sc_set_vs_coeffs(struct sc_data *sc, void *addr, unsigned int src_h,
+ unsigned int dst_h);
struct sc_data *sc_create(struct platform_device *pdev);
#endif