[PATCH 04/33] drm/omap: add dmm_read() and dmm_write() wrappers

[Laurent Pinchart]

Hi Tomi,

Thank you for the patch.

On Friday 19 February 2016 11:47:39 Tomi Valkeinen wrote:
> This patch adds wrapper functions for readl() and writel(), dmm_read()
> and dmm_write(), so that we can implement workaround for errata i878.
> 
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen at ti.com>

Reviewed-by: Laurent Pinchart <laurent.pinchart at ideasonboard.com>

> ---
>  drivers/gpu/drm/omapdrm/omap_dmm_tiler.c | 39 ++++++++++++++++++-----------
>  1 file changed, 24 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
> b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c index 4e04f9487375..fe5260477b52
> 100644
> --- a/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
> +++ b/drivers/gpu/drm/omapdrm/omap_dmm_tiler.c
> @@ -79,6 +79,16 @@ static const uint32_t reg[][4] = {
>  			DMM_PAT_DESCR__2, DMM_PAT_DESCR__3},
>  };
> 
> +static u32 dmm_read(struct dmm *dmm, u32 reg)
> +{
> +	return readl(dmm->base + reg);
> +}
> +
> +static void dmm_write(struct dmm *dmm, u32 val, u32 reg)
> +{
> +	writel(val, dmm->base + reg);
> +}
> +
>  /* simple allocator to grab next 16 byte aligned memory from txn */
>  static void *alloc_dma(struct dmm_txn *txn, size_t sz, dma_addr_t *pa)
>  {
> @@ -108,7 +118,7 @@ static int wait_status(struct refill_engine *engine,
> uint32_t wait_mask)
> 
>  	i = DMM_FIXED_RETRY_COUNT;
>  	while (true) {
> -		r = readl(dmm->base + reg[PAT_STATUS][engine->id]);
> +		r = dmm_read(dmm, reg[PAT_STATUS][engine->id]);
>  		err = r & DMM_PATSTATUS_ERR;
>  		if (err)
>  			return -EFAULT;
> @@ -140,11 +150,11 @@ static void release_engine(struct refill_engine
> *engine) static irqreturn_t omap_dmm_irq_handler(int irq, void *arg)
>  {
>  	struct dmm *dmm = arg;
> -	uint32_t status = readl(dmm->base + DMM_PAT_IRQSTATUS);
> +	uint32_t status = dmm_read(dmm, DMM_PAT_IRQSTATUS);
>  	int i;
> 
>  	/* ack IRQ */
> -	writel(status, dmm->base + DMM_PAT_IRQSTATUS);
> +	dmm_write(dmm, status, DMM_PAT_IRQSTATUS);
> 
>  	for (i = 0; i < dmm->num_engines; i++) {
>  		if (status & DMM_IRQSTAT_LST) {
> @@ -275,7 +285,7 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool
> wait) readl(&txn->last_pat->next_pa);
> 
>  	/* write to PAT_DESCR to clear out any pending transaction */
> -	writel(0x0, dmm->base + reg[PAT_DESCR][engine->id]);
> +	dmm_write(dmm, 0x0, reg[PAT_DESCR][engine->id]);
> 
>  	/* wait for engine ready: */
>  	ret = wait_status(engine, DMM_PATSTATUS_READY);
> @@ -291,8 +301,7 @@ static int dmm_txn_commit(struct dmm_txn *txn, bool
> wait) smp_mb();
> 
>  	/* kick reload */
> -	writel(engine->refill_pa,
> -		dmm->base + reg[PAT_DESCR][engine->id]);
> +	dmm_write(dmm, engine->refill_pa, reg[PAT_DESCR][engine->id]);
> 
>  	if (wait) {
>  		if (!wait_for_completion_timeout(&engine->compl,
> @@ -659,7 +668,7 @@ static int omap_dmm_probe(struct platform_device *dev)
> 
>  	omap_dmm->dev = &dev->dev;
> 
> -	hwinfo = readl(omap_dmm->base + DMM_PAT_HWINFO);
> +	hwinfo = dmm_read(omap_dmm, DMM_PAT_HWINFO);
>  	omap_dmm->num_engines = (hwinfo >> 24) & 0x1F;
>  	omap_dmm->num_lut = (hwinfo >> 16) & 0x1F;
>  	omap_dmm->container_width = 256;
> @@ -668,7 +677,7 @@ static int omap_dmm_probe(struct platform_device *dev)
>  	atomic_set(&omap_dmm->engine_counter, omap_dmm->num_engines);
> 
>  	/* read out actual LUT width and height */
> -	pat_geom = readl(omap_dmm->base + DMM_PAT_GEOMETRY);
> +	pat_geom = dmm_read(omap_dmm, DMM_PAT_GEOMETRY);
>  	omap_dmm->lut_width = ((pat_geom >> 16) & 0xF) << 5;
>  	omap_dmm->lut_height = ((pat_geom >> 24) & 0xF) << 5;
> 
> @@ -678,12 +687,12 @@ static int omap_dmm_probe(struct platform_device *dev)
> omap_dmm->num_lut++;
> 
>  	/* initialize DMM registers */
> -	writel(0x88888888, omap_dmm->base + DMM_PAT_VIEW__0);
> -	writel(0x88888888, omap_dmm->base + DMM_PAT_VIEW__1);
> -	writel(0x80808080, omap_dmm->base + DMM_PAT_VIEW_MAP__0);
> -	writel(0x80000000, omap_dmm->base + DMM_PAT_VIEW_MAP_BASE);
> -	writel(0x88888888, omap_dmm->base + DMM_TILER_OR__0);
> -	writel(0x88888888, omap_dmm->base + DMM_TILER_OR__1);
> +	dmm_write(omap_dmm, 0x88888888, DMM_PAT_VIEW__0);
> +	dmm_write(omap_dmm, 0x88888888, DMM_PAT_VIEW__1);
> +	dmm_write(omap_dmm, 0x80808080, DMM_PAT_VIEW_MAP__0);
> +	dmm_write(omap_dmm, 0x80000000, DMM_PAT_VIEW_MAP_BASE);
> +	dmm_write(omap_dmm, 0x88888888, DMM_TILER_OR__0);
> +	dmm_write(omap_dmm, 0x88888888, DMM_TILER_OR__1);
> 
>  	ret = request_irq(omap_dmm->irq, omap_dmm_irq_handler, IRQF_SHARED,
>  				"omap_dmm_irq_handler", omap_dmm);
> @@ -701,7 +710,7 @@ static int omap_dmm_probe(struct platform_device *dev)
>  	 * buffers for accelerated pan/scroll) and FILL_DSC<n> which
>  	 * we just generally don't care about.
>  	 */
> -	writel(0x7e7e7e7e, omap_dmm->base + DMM_PAT_IRQENABLE_SET);
> +	dmm_write(omap_dmm, 0x7e7e7e7e, DMM_PAT_IRQENABLE_SET);
> 
>  	omap_dmm->dummy_page = alloc_page(GFP_KERNEL | __GFP_DMA32);
>  	if (!omap_dmm->dummy_page) {

-- 
Regards,

Laurent Pinchart